Artigos de revistas: "Aluminum alloys"

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Kucharčík, L., M. Brůna e A. Sládek. "Influence of Chemical Composition on Porosity in Aluminium Alloys". Archives of Foundry Engineering 14, n.º 2 (1 de junho de 2014): 5–8. http://dx.doi.org/10.2478/afe-2014-0026.

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Abstract Porosity is one of the major defects in aluminum castings, which results is a decrease of a mechanical properties. Porosity in aluminum alloys is caused by solidification shrinkage and gas segregation. The final amount of porosity in aluminium castings is mostly influenced by several factors, as amount of hydrogen in molten aluminium alloy, cooling rate, melt temperature, mold material, or solidification interval. This article deals with effect of chemical composition on porosity in Al-Si aluminum alloys. For experiment was used Pure aluminum and four alloys: AlSi6Cu4, AlSi7Mg0, 3, AlSi9Cu1, AlSi10MgCu1.

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Han, Yu, Bao An Chen, Zhi Xiang Zhu, Dong Yu Liu e Yan Qiu Xia. "Effects of Zr on Microstructure and Conductivity of Er Containing Heat-Resistant Aluminum Alloy Used for Wires". Materials Science Forum 852 (abril de 2016): 205–10. http://dx.doi.org/10.4028/www.scientific.net/msf.852.205.

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It has particular heat-resistant property and conductivity of high-conductivity heat-resistant Aluminium alloys, which would be wildly applied in transmission and transformation flied. Al-Er-Zr alloys containing different content of Zr were prepared. The effect of Zr on microstructure of heat-resistance Aluminum alloy were studied by using of STEM, and thermodynamic behavior of Zr in Aluminium alloy was analyzed based on the theory of alloy phase formation. The results showed that the effect of Zr content on the grain size of heat-resistant aluminum alloy was remarkable, and the conductivity of heat-resistance Aluminum alloy was influenced.

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Edigarov, V. R. "Surface Friction-Electric Treatment of Aluminum Alloys". Proceedings of Higher Educational Institutions. Маchine Building, n.º 10 (727) (novembro de 2020): 47–53. http://dx.doi.org/10.18698/0536-1044-2020-10-47-53.

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This paper examines a combined friction-electric treatment of surface layers of machine parts made of aluminums alloys. The temperature released during the friction process is the main technological factor of the treatment, and the heat released during the passage of electric current through the local volume of friction-thermal action is an additional heat source. The paper presents the results of studying a surface modification method involving friction-electric treatment of aluminium alloys with reinforcement by aluminium oxide particles under varied technological conditions: density of electric current, pressing force of the tool, shape of the tool working zone and speed of treatment. A hard alloy tool with high temperature resistance was used as a tool for friction-electric treatment. The tool was installed in a mandrel of a special design allowing supply of a modifier representing a mixture of aluminum oxide particles with a surfactant to the treatment zone. Using the friction-electric treatment of the surface layer of samples with reinforcement by aluminum oxide particles it was possible to increase the surface hardness by about 30–40 % and thickness of the hardened layer by 3–5 times due to the local deformation and passage of electric current through the treatment zone, and to improve wear resistance of the surface layer.

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Zhou, Jia, Jun Ping Zhang e Ming Tu Ma. "Study on the Formability of Aluminium Alloy Sheets at Room and Elevated Temperatures". Materials Science Forum 877 (novembro de 2016): 393–99. http://dx.doi.org/10.4028/www.scientific.net/msf.877.393.

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This paper presents the main achievements of a research project aimed at investigating the applicability of the hot stamping technology to non heat treatable aluminium alloys of the 5052 H32 and heat treatable aluminium alloys of the 6016 T4P after six months natural aging. The formability and mechanical properties of 5052 H32 and 6016 T4P aluminum alloy sheets after six months natural aging under different temperature conditions were studied, the processing characteristics and potential of the two aluminium alloy at room and elevated temperature were investigated. The results indicated that the 6016 aluminum alloy sheet exhibit better mechanical properties at room temperature. 5052 H32 aluminum alloy sheet shows better formability at elevated temperature, and it has higher potential to increase formability by raising the temperature.

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Mounika, G. "Closed Loop Reactive Power Compensation on a Single-Phase Transmission Line". International Journal for Research in Applied Science and Engineering Technology 9, n.º VI (20 de junho de 2021): 2156–59. http://dx.doi.org/10.22214/ijraset.2021.35489.

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Zinc-aluminium alloys are alloys whose main ingredients stay zinc and aluminium. Other alloying elements clasp magnesium and copper .Zinc Aluminum Alloys over the past decayed are occupying attention of both researches and industries as a promising material for tribological applications. At this moment commercially available Zinc-Aluminium alloys and bearing bronzes due to good cost ability and unique combination of properties. They can also be deliberated as competing material for cast iron, plastics and even for steels. It has been shown that the addition of alloying elements including copper, silicon, magnesium, manganese and nickel can improve the mechanical and tribological properties of zinc aluminum alloys. This alloy has still found limited applications encompassing high stress conditions due to its lower creep resistance, compared to traditional aluminum alloys and other structural materials. This has resulted in major loss of market potential for those alloy otherwise it is excellent material. The aim of this paper is to measure the coefficient of friction and wear under different operating conditions for material with silicon content. Then wear equation will be found out for all the materials experimented under various conditions. In this paper there is discussion of the effect of Silicon on tribological properties of aluminium based Zinc alloy by experiment as well as Ansys software based and compares the same.

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Fan, Yang Yang, e Makhlouf M. Makhlouf. "Castable Aluminium Alloys for High Temperature Applications". Materials Science Forum 765 (julho de 2013): 8–12. http://dx.doi.org/10.4028/www.scientific.net/msf.765.8.

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Most traditional aluminium casting alloys are based on the aluminium-silicon eutectic system because of its excellent casting characteristics. However, the solidus in this system does not exceed 577 °C and the major alloying elements used with silicon in these alloys have high diffusivity in aluminium. Therefore, while these elements enhance the room temperature strength of the alloy, they are not useful at elevated temperatures. Considering nickel-base superalloys, whose mechanical properties are retained up to temperatures that approach 75% of their melting point, it is conceivable that castable aluminium alloys can be developed on the same basis so that they are useful at temperatures approaching 300 °C. In this publication, we present the thought process behind developing a new castable aluminum alloy that is designed specifically for such high temperature applications and we present the alloy’s measured castability characteristics and its elevated temperature tensile properties.

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Bouzekova-Penkova, Anna, e Adelina Miteva. "Some Aerospace Applications of 7075 (B95) Aluminium Alloy". Aerospace Research in Bulgaria 34 (2022): 165–79. http://dx.doi.org/10.3897/arb.v34.e15.

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Nowadays, aluminium alloys are of growing interest to scientists and are widely used in aerospace and allied industries due to their inherent lightness, high strength to weight ratio, excellent thermal and electrical conductance, good reflectivity and low working cost. Among the conventional structural materials used in aerospace applications aluminium alloys are frontrunners. This is due to the ability of modern aluminium alloys to achieve unique combination of properties, through alloying and heat treatment, tailored to particular applications. Aluminum alloy 7075 (B95) is a high-strength alloy that works in extreme conditions and is used in modern construction of aircraft, spacecraft and satellites. In this mini-review, we will briefly focus on some of the existing and growing applications of some 7xxx aluminum alloys, in particular 7075 (B95), in the aerospace industry. Possible options for continuing work in this area are considered, and some Bulgarian developments are presented.

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Wongpreedee, Kageeporn, Panphot Ruethaitananon e Tawinun Isariyamateekun. "Interface Layers of Ag-Al Fusing Metals by Casting Processes". Advanced Materials Research 787 (setembro de 2013): 341–45. http://dx.doi.org/10.4028/www.scientific.net/amr.787.341.

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The materials of fusing metals commercially used in the jewelry niche marketing is seen as precious metals. An innovation of fusing metals searched for new materials to differentiate from the markets for mass production. In this research, it studied the bonding processes of silver and aluminium metals by casting processes for mass productions. The studies had been varied parameters on the types of aluminium and process temperature controls. This research had used two types of aluminium which were pure aluminium 99.99% and aluminum 5083 alloys bonding with pure silver 99.99%. The temperatures had been specified for two factors including casting temperature at X1, X2 and flasking temperature at Y1, Y2. From the results, it was found that the casting temperature at 730°C and the flasking temperature at 230 °C of pure silver-aluminum 5083 alloys bonding had the thinnest average thickness of interface at 427.29 μm. The microstructure of pure silver-aluminum 5083 alloy bonding was revealed eutectic-like structures at the interfaces. The EDS analysis showed the results of compounds at interface layers of Ag sides giving Ag2Al intermetallics on pure silver-aluminum 5083 alloy bonding unlike pure silver-pure aluminium bonding giving Ag3Al intermetallics.

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Alawady, Mohamed Ahmed. "استكشاف تعدد استخدامات الألمنيوم في الهندسة الميكانيكية". Journal of engineering sciences and information technology 8, n.º 2 (30 de junho de 2024): 27–37. http://dx.doi.org/10.26389/ajsrp.k290524.

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Aluminum, known for its lightweight, high strength, and excellent corrosion resistance, is a critical material in mechanical engineering. Its unique properties make it indispensable in various industries, including aerospace, automotive, construction, and packaging. This research paper explores the fundamental properties of aluminum that contribute to its widespread use. It discusses the metal's high strength-to-weight ratio, excellent thermal and electrical conductivity, and significant ductility and malleability. These characteristics allow aluminum to be formed into complex shapes and structures, essential for advanced engineering applications. In the aerospace industry, aluminum alloys are extensively used in manufacturing aircraft frames and components, contributing to improved fuel efficiency and performance. In the automotive sector, aluminum's lightweight nature helps reduce vehicle weight, enhancing fuel efficiency and lowering emissions. The construction industry benefits from aluminum's strength and corrosion resistance, making it ideal for building durable infrastructure. Additionally, aluminum's high thermal conductivity makes it suitable for heat exchangers in HVAC systems, automotive radiators, and electronic cooling systems. Recent advancements in aluminum technology have further expanded its applications. The development of aluminum-lithium alloys offers higher strength and lower density than traditional aluminum alloys, making them particularly suitable for aerospace applications. Recycling advancements have made aluminum production more sustainable, reducing environmental impact and energy consumption. Research into nanostructured aluminum shows promise for creating materials with enhanced properties, such as increased strength and improved resistance to wear and corrosion. Additive manufacturing with aluminum alloys allows for the creation of complex and lightweight components, previously challenging to produce with traditional methods. In conclusion, aluminum's versatile properties make it an essential material in mechanical engineering. Its applications across various industries demonstrate its critical role in advancing technology and improving performance. Ongoing research and technological advancements continue to enhance aluminum's capabilities, ensuring its significance in the field of mechanical engineering.

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Huang, Chuan Yong. "Electroless Ni-La-P Coatings on 2024 Aluminum Alloys for Aircraft Structure". Applied Mechanics and Materials 224 (novembro de 2012): 348–51. http://dx.doi.org/10.4028/www.scientific.net/amm.224.348.

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2024 aluminium alloys are widely used in airframe construction.However,this series of alloys are susceptible to corrosion to limit their usefulness,In this study,electroless Ni-La-P alloy plating on aluminum alloy and the effects of pH value,temperature and concentration of LaNiO3 on deposition rate were investigated.Surface morphology and corosion-resistant of the electroless Ni-La-P deposits were evaluated.The results showed the corrosion-resistant in 5％ NaC1 solutions obviously enhance compared with original aluminum alloy using electroless Ni-La-P deposition method．

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Yadwinder Pal Sharma e Pardeep Kumar. "Effect of Welding Parameters on The Properties of Aluminium Alloys 6063 and 6101 Welded with Friction Stir Welding". Asian Review of Mechanical Engineering 3, n.º 2 (5 de novembro de 2014): 43–47. http://dx.doi.org/10.51983/arme-2014.3.2.2379.

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Friction stir welding (FSW) has got wide attraction in aerospace and automobile industries, as conventional fusion welding techniques are susceptible to various welding defects like cracks and porosity, Welding of aluminum alloys were also a matter of concern because of the thin oxide layer formation on the surface of alloys as this oxide layer tends to thicken at higher temperatures. Friction stir welding process shows several advantages to weld aluminum alloys. In the present research the optimization of the mechanical properties of welded joint of aluminum alloy of 6000 series are considered. This aluminium alloy series is used for architectural fabrication due to good surface finish, high corrosion resistance and good mechanical properties. The aluminium alloys 6063 and 6101 are successfully welded with friction stir welding technique. Two different rotation speeds of tool 1600 rpm and 1200 rpm and two different pin profiles tools square & hexagonal are selected for this work. From the results it is observed that the joint welded with hexagonal pin profile at 1200 rpm tool rotation speed gives superior mechanical properties.

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Zhu, Sheng, Guo Feng Han, Xiao Ming Wang, Yu Xiang Liu e Zhi Qian Wang. "Electrochemical Characteristics of TiAl Coating on Aluminum Alloy Surface by Supersonic Particles Deposition". Advanced Materials Research 1051 (outubro de 2014): 199–203. http://dx.doi.org/10.4028/www.scientific.net/amr.1051.199.

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In this study, Ti-45Al-7Nb-4V alloy protective coating which base on γ-TiAl phase was deposited on the surface of 5803 aluminum alloy by supersonic particles deposition technology. Researchers observed the micro-structure of the TiAl alloy casting and coating by SEM, and researched the electrochemical characteristics and the galvanic corrosion between TA2 titanium alloy and 5083 aluminum alloy or TiAl alloy casting and coating by electrochemical work station. The results show that,the galvanic corrosion current between 5083 aluminium alloy and TA2 titanium alloy declines from 16.2μA to 0.27μA after TiAl protecting coatings are prepared on the substrates, besides, the corrosion susceptibility drops from E degree to A degree. It also manifests that the 5083 aluminium alloy with Ti-45Al-7Nb-4V coatings can be contacted and utilized with TA2 titanium alloy directly, which tackles the issues of gavanic corrosion prevention between aluminium alloys and titanium alloys.

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YOSHIDA, HIDEO. "Aluminum Alloys". Sen'i Gakkaishi 48, n.º 9 (1992): P496—P504. http://dx.doi.org/10.2115/fiber.48.9_p496.

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Zou, Cheng Lu, Gui Hong Geng e Wei Ye Chen. "Development and Application of Aluminium-Lithium Alloy". Applied Mechanics and Materials 599-601 (agosto de 2014): 12–17. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.12.

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The history of aluminium-lithium alloys development has been reviewed in this paper. According to the strength, weld ability and corrosion resistance, thermal stability and plasticity, aluminium-lithium alloy has been categorized and the defects of aluminium-lithium alloys in early stage have been analyzed. As compared the third generation of aluminium-lithium alloy with normal aluminum alloy and composite materials, it indicates aluminium-lithium alloy has better performance, lower cost and reduced weight. After analyzing the advantages and disadvantages of the rapid solidification, ingot casting metallurgy and electromagnetic simulated microgravity methods in synthesis of aluminium-lithium alloy, it has been found microgravity method has prominent effect on reducing the alloy segregation and lithium losses. Finally, the future development of aluminium-lithium alloys has been discussed.

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Huynh, Khanh Cong, e Luc Hoai Vo. "Modification of aluminium and aluminium alloys by AL-B master alloy". Science and Technology Development Journal 17, n.º 2 (30 de junho de 2014): 56–66. http://dx.doi.org/10.32508/stdj.v17i2.1315.

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Chemical compositions and microstructures affect on mechanical – physical and working properties of aluminium and aluminum alloys. Transition elements, such as Ti, V, Cr, Zr in solid solution greatly reduce the electrical conductivity of aluminium and its alloys. For reduction of detrimental effects of transition elements, Al-B master alloys are added into molten aluminium to occur reactions of boron and transition elements to form diborides of titanium, vanadium, chromium and zirconium, which are markedly insoluble in molten aluminium, then these transition elements have an insignificant effects on conductivity. In addition, Al-B master alloys is also used as a grain refiner of aluminium and aluminium alloys. Aluminium borides particles in Al-B master alloys act as substrates for heterogeneous nucleation of aluminium and its alloys. Al-B master alloys are prepared from low cost materials, such as boric acid H3BO3 and cryolite Na3AlF6, by simple melting method, easily realize in electrical wire and cable factories.

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Ishimaru, Hajime. "Developments and Applications for All-Aluminum Alloy Vacuum Systems". MRS Bulletin 15, n.º 7 (julho de 1990): 23–31. http://dx.doi.org/10.1557/s0883769400059212.

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Aluminum and aluminum alloys have long been among the preferred materials for ultrahigh vacuum (UHV) systems operating in the 10−10–10−11 torr (10−8–10−11 Pa) range. Pure aluminum and aluminum alloys have an extremely low outgassing rate, are completely nonmagnetic, lack crystal structure transitions at low temperatures, are not sources of heavy metals contamination in semiconductor processing applications, have low residual radioactivity in radiation environments, and are lightweight. Because of aluminum's high thermal conductivity and low thermal emissivity, aluminum components can tolerate high heat fluxes in spite of the relatively low melting point of aluminum.Recently developed aluminum alloys and new surface finishing techniques allow the attainment of extremely high vacuums (XHV) in the 10−12–10−13 torr (10−10–10−11 Pa) range. XHV technology requires the use of special aluminum alloy flange/gasket/bolt, nut and washer combinations, aluminum alloy-ceramic seals, windows, bellows, right-angle and gate valves, turbomolecular pumps, sputter ion pumps and titanium sublimination pumps, Bayard-Alpert ion gauges, quadrupole mass filters, and related aluminum alloy vacuum components. New surface treatment methods and new techniques in welding and extremely sensitive helium leak testing are required. In short, a whole new technology has been developed to take advantage of the opportunities presented by these new vacuum materials. This article describes some of these newly developed fabrication technologies and vacuum materials.The TRISTAN electron-positron collider constructed at the National Laboratory for High Energy Physics in Japan is the first all-aluminum alloy accelerator, and the first to use UHV technology.

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Liu, Yixian, e Shoumei Xiong. "Research Progress on Thermal Conductivity of High-Pressure Die-Cast Aluminum Alloys". Metals 14, n.º 4 (22 de março de 2024): 370. http://dx.doi.org/10.3390/met14040370.

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High-pressure die casting (HPDC) has been extensively used to manufacture aluminum alloy heat dissipation components in the fields of vehicles, electronics, and communication. With the increasing demand for HPDC heat dissipation components, the thermal conductivity of die-cast aluminum alloys is paid more attention. In this paper, a comprehensive review of the research progress on the thermal conductivity of HPDC aluminum alloys is provided. First of all, we introduce the general heat transport mechanism in aluminum alloys, including electrical transport and phonon transport. Secondly, we summarize several common die-cast aluminum alloy systems utilized for heat dissipation components, such as an Al–Si alloy system and silicon-free aluminum alloy systems, along with the corresponding composition optimizations for these alloy systems. Thirdly, the effect of processing parameters, which are significant for the HPDC process, on the thermal conductivity of HPDC aluminum alloys is discussed. Moreover, some heat treatment strategies for enhancing the thermal conductivity of die-cast aluminum alloys are briefly discussed. Apart from experimental findings, a range of theoretical models used to calculate the thermal conductivity of die-cast aluminum alloys are also summarized. This review aims to guide the development of new high-thermal-conductivity die-cast aluminum alloys.

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Skachkov, V. M., L. A. Pasechnik, S. A. Bibanaeva, I. S. Medyankina e N. A. Sabirzyanov. "TWO TYPES OF GALLIUM EXPOSURE TO ALUMINUM". Расплавы, n.º 6 (1 de novembro de 2023): 624–33. http://dx.doi.org/10.31857/s0235010623060075.

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The effect of gallium on aluminum during their fusion is investigated. The corrosion rate of aluminum alloys with 1, 2 and 5 at % gallium content was experimentally determined, which was 0.001, 0.00101 and 0.00062 g/m2 · h, respectively, which is less than that of pure grade A99 aluminum – 0.0016 g/m2 · h. The rate of dissolution of these alloys in acidic and alkaline media is determined. X-ray phase analysis showed the homogeneity of the alloys under consideration. The morphology of aluminum alloys with gallium was studied, after exposure to an aggressive environment – a solution of hydrochloric acid. The possibility of obtaining hydrogen and nanoscale alumina by decomposition of water by activated gallium aluminum alloy is shown. Activation of the aluminum surface by gallium alloy occurs according to the Rebinder effect and the article presents a micrograph of the surface of aluminum treated with Ga-Sn alloy, clearly demonstrating this effect. When using metallic gallium in contact with aluminum, the interaction requires heating to a temperature above 30°C (the melting point of gallium is 29.7°C), the melting point of the eutectic composition 92Ga–8Sn is 20.0°C, which allows the interaction to begin at room temperature. At temperatures of about 4°C, activated aluminum can be stored for a long time. The quality of hydrogen obtained by decomposition of water should be higher than that obtained by cracking, and the cost is close to a well-developed technology of electrolysis of water and no more than 2 times the cost of its synthesis via cracking of hydrocarbons. Gallium and its liquid alloys are non-toxic, almost do not interact with water, activate aluminum, preventing the formation of a protective oxide film, penetrate into the intergranular space and aluminum easily interacts with water, forming hydrogen and aluminum hydroxide.

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AIURA, Tadashi, e Kazuhiko ASANO. "Lecture. Machining of aluminum alloys. Machining of aluminum alloys." Journal of Japan Institute of Light Metals 40, n.º 4 (1990): 317–32. http://dx.doi.org/10.2464/jilm.40.317.

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Alymov, M. I., Yu V. Levinsky e E. V. Vershinina. "P – T – х diagram of the Al – Ba system". Physics and Chemistry of Materials Treatment 5 (2023): 66–71. http://dx.doi.org/10.30791/0015-3214-2023-5-66-71.

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Intermetallic compounds formed in Al – Ba system are stable at temperatures above the melting point of both barium and aluminum, which allows to consider barium as a promising element for aluminum alloys operating at high temperatures and characterized by relatively high vapor pressure of barium. On the other hand, aluminum-barium ligature is widely used in various fields of metallurgy for the preparation of alloys and complex modification of steels and cast irons: aluminum improves the quality of steels, acting as a reducing agent for iron in its oxide compounds, and barium contributes to the graphitization of cast irons, which leads to an improvement in the pearlite and ferritic structures. The study of the aluminum-barium system (Al – Ba) demands taking into account the high vapor pressure of Ba, which requires analysis of the system in the pressure-temperature-concentration coordinates (p – T – x diagrams), which is the aim of the present paper. The results obtained in this work can be successfully used in the development of ternary and more alloys containing aluminium and barium.

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Narivskiy, A., S. Polyvoda, M. Voron e O. Siryi. "MHD-processes and equipment for continuous casting of aluminum alloy ingots". Casting processes 150, n.º 4 (1 de dezembro de 2022): 22–27. http://dx.doi.org/10.15407/plit2022.04.022.

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The design and technological capabilities of the multifunctional MHD-complex for the preparation of aluminum alloys and their continuous casting ingots are presented. Technology of preparing Al-2.5 wt.% Zr master-alloy in the MHD installation and continuous casting of ingots from it has been developed. It is shown that the use of electromagnetic stirring of a solid-liquid phase inside ingot during continuous casting allows to disperse the structure in aluminum master-alloys with refractory elements. Master-alloy bar was made from Al-2.5 wt.% Zr alloy ingot for continuous modification during ingot casting. The technology of medicated ingots continuous casting from high-strength aluminum alloy B96Ц1 with its modification with master-alloy bar was developed, which allowed to reduce the grain size by 3.5 times and to increase the strength of pressed products by 6% and relative elongation by 35-40%, compared to products made from continuously casted ingots of this alloy and casted without modification with overviewed master-alloy. Keywords: MHD, high-strength aluminum alloys, modification, ingot.

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Sheshukov, O. Yu, e V. V. Kataev. "Influence of titanium and zirconium on structure and heat-resistance of low-carbon iron-aluminium alloys". Izvestiya. Ferrous Metallurgy 64, n.º 9 (9 de outubro de 2021): 685–92. http://dx.doi.org/10.17073/0368-0797-2021-9-685-692.

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The paper considers the effect of introducing ferroalloys containing titanium and zirconium on the structure and heat-resistance of low-carbon ferroalloys. Theoretically and experimentally, it has been proven that addition of 1.0 mass. % of titanium and 0.1 mass. % of zirconium to a low-carbon iron-aluminum melt containing 12 – 14 mass. % of aluminum, grinds its structure increasing temporary resistance and heat-melting. Titanium and zirconium are strong carbide-forming elements. When introduced into a low-carbon iron-aluminium alloy, they form a large number of crystallization centers, thus affecting its microstructure, allowing to get shredded and more equal grain compared to an alloy without additive. This in turn increases the strength limit of processed alloy. In addition, the use of titanium as a modifying additive in a low-carbon ferroalloy allows increasing its heatresistance, which exceeds several times the heat-resistance of famous chrome-nickel steel of 20Kh23N18 grade. As a result, a new technology for obtaining titanium and zirconium was developed based on research of the effect of their modifying additives on the structure and heat-resistance of low-carbon iron-aluminum alloys.

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Wang, Xin, Dongyun Zhang, Ang Li, Denghao Yi e Tianci Li. "A Review on Traditional Processes and Laser Powder Bed Fusion of Aluminum Alloy Microstructures, Mechanical Properties, Costs, and Applications". Materials 17, n.º 11 (25 de maio de 2024): 2553. http://dx.doi.org/10.3390/ma17112553.

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Due to its lightweight, high strength, good machinability, and low cost, aluminum alloy has been widely used in fields such as aerospace, automotive, electronics, and construction. Traditional manufacturing processes for aluminum alloys often suffer from low material utilization, complex procedures, and long manufacturing cycles. Therefore, more and more scholars are turning their attention to the laser powder bed fusion (LPBF) process for aluminum alloys, which has the advantages of high material utilization, good formability for complex structures, and short manufacturing cycles. However, the widespread promotion and application of LPBF aluminum alloys still face challenges. The excellent printable ability, favorable mechanical performance, and low manufacturing cost are the main factors affecting the applicability of the LPBF process for aluminum alloys. This paper reviews the research status of traditional aluminum alloy processing and LPBF aluminum alloy and makes a comparison from various aspects such as microstructures, mechanical properties, application scenarios, and manufacturing costs. At present, the LPBF manufacturing cost for aluminum alloys is 2–120 times higher than that of traditional manufacturing methods, with the discrepancy depending on the complexity of the part. Therefore, it is necessary to promote the further development and application of aluminum alloy 3D printing technology from three aspects: the development of aluminum matrix composite materials reinforced with nanoceramic particles, the development of micro-alloyed aluminum alloy powders specially designed for LPBF, and the development of new technologies and equipment to reduce the manufacturing cost of LPBF aluminum alloy.

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Geanta, Victor, Ionelia Voiculescu, Ioan Milosan, Bogdan Istrate e Ileana Mariana Mates. "Chemical Composition Influence on Microhardness, Microstructure and Phase Morphology of AlxCrFeCoNi High Entropy Alloys". Revista de Chimie 69, n.º 4 (15 de maio de 2018): 798–801. http://dx.doi.org/10.37358/rc.18.4.6203.

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The AlCrFeCoNi high entropy alloy exhibits unexpected properties that can be obtained after mixing five different elements, which could not be obtained from any one independent element. The difference to conventional alloys is that these alloys may have, at the same time, both hardness and plasticity, can be used in severe impact applications. In order to study the influence of aluminum content on the microhardness and microstructure of the high entropy alloys AlxCrFeCoNi (x: atomic ratio, x= 0.2 to 2.0) nine types of samples were obtained as mini-sized ingots (50x15x9.5 mm and 40 g weight). The mini-ingots were obtained using arc melt casting process in a vacuum arc remelting device (VAR MRF ABJ 900). The influence of the chemical elements on the microstructure, phases morphology and microhardness of AlxCrFeCoNi system was studied. The results have confirmed that mechanical properties could be greatly adjusted by the chemical composition change. The main element that influences the microhardness of the analyzed system is aluminum, due to the formation of Al-Fe compounds with high hardness. Increasing the aluminum content in the alloy to values greater than 1.8 ... 2 at.% contribute to the increase of hardness and also to the embrittlement thereof. Other elements like Cr, Fe, Co and Ni can contribute to mitigate increasing the hardness of the alloy. The type of phases formed in high entropy alloy are dependent to the aluminum concentration. So, depending on of aluminium content, different phases are obtained, like FCC for low Al content, mixture of FCC and BCC for about 2.5 %Al and BCC for high Al content. The crystallite size depends on the chemical composition and increase with the aluminium content.

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ETO, Takehiko. "Wrought aluminum alloys." Journal of Japan Institute of Light Metals 44, n.º 11 (1994): 682–93. http://dx.doi.org/10.2464/jilm.44.682.

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KITAOKA, Sanji, Chozo FUJIKURA e Akihiko KAMIO. "Aluminum-silicon alloys." Journal of Japan Institute of Light Metals 38, n.º 7 (1988): 426–46. http://dx.doi.org/10.2464/jilm.38.426.

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KOJIMA, Yo. "Aluminum-Lithium alloys." Journal of Japan Institute of Light Metals 39, n.º 1 (1989): 67–80. http://dx.doi.org/10.2464/jilm.39.67.

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Martin, J. W. "Aluminum-Lithium Alloys". Annual Review of Materials Science 18, n.º 1 (agosto de 1988): 101–19. http://dx.doi.org/10.1146/annurev.ms.18.080188.000533.

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Antipov, V. V., Yu Yu Klochkova e V. A. Romanenko. "Modern aluminum and aluminum-lithium alloys". «Aviation Materials and Technologies», S (junho de 2017): 195–211. http://dx.doi.org/10.18577/2071-9140-2017-0-s-195-211.

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Kim, Kyungmok. "Creep–rupture model of aluminum alloys: Cohesive zone approach". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 229, n.º 8 (10 de julho de 2014): 1343–47. http://dx.doi.org/10.1177/0954406214543413.

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In this article, a creep–rupture model of aluminum alloys is developed using a time-dependent cohesive zone law. For long-term creep rupture, a time jump strategy is used in a cohesive zone law. Stress–rupture scatter of aluminum alloy 4032-T6 is fitted with a power law form. Then, change in the slope of a stress-rupture line is identified on a log–log scale. Implicit finite element analysis is employed with a model containing a cohesive zone. Stress–rupture curves at various given temperatures are calculated and compared with experimental ones. Results show that a proposed method allows predicting creep–rupture life of aluminum alloys.

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Al nefawy, Mohamad Yehea, Fouad El dahiye e Mahmoud Al Assaad. "The Effect of Heat Treatments and Nickel Additive on The Microstructure and Tensile Properties of 7075 Aluminum Alloy". Association of Arab Universities Journal of Engineering Sciences 27, n.º 2 (30 de junho de 2020): 154–61. http://dx.doi.org/10.33261/jaaru.2020.27.2.014.

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The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. The effect of adding Nickel and heat treatments on the microstructure, formed phases and tensile properties of the 7075 aluminum alloy were studied in this paper. Different percentages of nickel [0.1, 0.5, 1] wt% was added to 7075 Aluminum alloy, and various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) was applied on the 7075 alloys that containing nickel. The results obtained by applying of RRA treatment were better than the results of T6 treatment, the tensile properties increased and the microstructure became softer by adding nickel to the studied alloys. The maximum tensile strength of 7075 aluminum alloy was (UTS = 437 Mpa) when RRA heat treatment was applied and 0.5% nickel was added.

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Joseph, Olufunmilayo Oluwabukola, e Micheal Olalekan Aluko. "Effect of Synthetic Materials in Reinforcement of Aluminium Matrix Composites". Materials Science Forum 1076 (8 de dezembro de 2022): 3–11. http://dx.doi.org/10.4028/p-o2816k.

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Aluminium matrix composite is a type of innovative technical material that have applications in aerospace, automotive, biotechnology, electronics, and a lot more. Non-metallic reinforcements can be injected into an aluminium alloy to provide advantages over base metal (Al) alloys. Better mechanical properties, improved microstructure, and corrosion resistance are the benefits that have been noticed upon reinforcements. The proportion of reinforcement, kind, size, and forms of aluminium matrix are all important factors in improving mechanical and tribological properties. Investigation in the creation of highly advanced tailored materials using liquid and solid-state processes and the impact it has on the properties and application are the subject of this work. The current research summarizes recent breakthroughs in aluminium-based composites and other particle reinforcement effects. The experiment findings revealed that strengthening the aluminum matrix with reinforcements increased mechanical properties and improves the microstructure. Also, stir casting was seen to be the most popular liquid metal approach because of its cost effectiveness and processing parameters which could easily be adjusted and monitored. It is concluded that aluminum matrix composites have greater mechanical characteristics, microstructure, and corrosion resistance than unreinforced aluminum alloys.

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Dostál, Petr, Michal Černý, Jaroslav Lev e David Varner. "Proportional monitoring of the acoustic emission in crypto-conditions". Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, n.º 5 (2011): 31–38. http://dx.doi.org/10.11118/actaun201159050031.

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The work is aimed at studying corrosion and fatigue properties of aluminum alloys by means of acoustic emission (AE). During material degradation are acoustic events scanned and evaluated. The main objective of the article is a description of behavior of aluminum alloys degraded in specific conditions and critical degradation stages determination. The first part of the article describes controlled degradation of the material in the crypto–conditions. The acoustic emission method is used for process analyzing. This part contains the AE signals assessment and comparing aluminium alloy to steel. Then the specimens are loaded on high-cyclic loading apparatus for fatigue life monitoring. Also, the synergy of fatigue and corrosion processes is taken into account.The aim is the description of fatigue properties for aluminum alloys that have already been corrosion-degraded. Attention is also focused on the structure of fatigue cracks. The main part of the article is aimed at corrosion degradation of aluminium alloys researched in real time by means of AE. The most important benefit of AE detection/recording is that it provides information about the process in real time. Using this measurement system is possible to observe the current status of the machines/devices and to prevent serious accidents.

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Alasad, Mahmoud, e Mohamad Yahya Nefawy. "The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy". مجلة جامعة فلسطين التقنية للأبحاث 7, n.º 2 (15 de setembro de 2019): 34–41. http://dx.doi.org/10.53671/pturj.v7i2.76.

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The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

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Alasad, Mahmoud, e Mohamad Yahya Nefawy. "The Effect of Heat Treatments and Nickel Additive on The Microstructure and Hardness of 7075 Aluminum Alloy". مجلة جامعة فلسطين التقنية خضوري للأبحاث 7, n.º 2 (15 de setembro de 2019): 34–41. http://dx.doi.org/10.53671/ptukrj.v7i2.76.

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The aluminum alloys of the 7xxx series consist of Al with Zn mainly, Mg and Cu. 7xxx aluminum alloys has high mechanical properties making it distinct from other aluminum alloys. In this paper, we examine the effect of adding Nickel and heat treatments on the microstructure and hardness of the 7075 aluminum alloy. Were we added different percentages of nickel [0.1, 0.5, 1] wt% to 7075 Aluminum alloy, and applied various heat treatments (artificial aging T6 and Retrogression and re-aging RRA) on the 7075 alloys that Containing nickel. By applying RRA treatment, we obtained better results than the results obtained by applying T6 treatment, and we obtained the high values of hardness and a smoother microstructure for the studied alloys by the addition of (0.5 wt%) nickel to alloy 7075.

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Mamala, A., e W. Sciężor. "Evaluation of the Effect of Selected Alloying Elements on the Mechanical and Electrical Aluminium Properties". Archives of Metallurgy and Materials 59, n.º 1 (1 de março de 2014): 413–17. http://dx.doi.org/10.2478/amm-2014-0069.

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Abstract Modern industry expects aluminum products with new, unusual, and well-defined functional properties. Last years we are able to notice constant development of aluminium alloys. In food industry, power engineering, electrical engineering and building engineering, flat rolled products of 1XXX series aluminium alloys are used.8XXX series alloys registered in Aluminium Association during last 20 years may be used as an alternative. These alloys have very good thermal and electrical conductivity and perfect technological formability. Moreover, these materials are able to obtain by aluminium scrap recycling. Fundamental alloy additives of 8XXX series are Fe, Si, Mn, Mg, Cu and Zn. Aluminium alloying with these additives makes it possible to obtain materials with different mechanical ale electrical properties. In this paper, the analysis of alloy elements content (in 8XXX series) effect on chosen properties of material in as cast and after thermal treatment tempers has been presented.

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Ganiev, I. N., F. A. Aliev, H. O. Odinazoda, A. M. Safarov e J. H. Jayloev. "Heat capacity and thermodynamic functions of aluminum conductive alloy E-AlMgSi (Aldrey) doped with gallium". Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering 22, n.º 3 (19 de janeiro de 2020): 219–27. http://dx.doi.org/10.17073/1609-3577-2019-3-219-227.

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Aluminum — a metal whose scope of application is constantly expanding. At present, aluminum and its alloys in a number of areas successfully displace traditionally used metals and alloys. The widespread use of aluminum and its alloys is due to its properties, among which, first of all, low density, satisfactory corrosion resistance and electrical conductivity, ability to apply protective and decorative coatings should be mentioned. All this, combined with the large reserves of aluminum in the earth’s crust, makes the production and consumption of aluminum very promising. One of the promising areas for the use of aluminum is the electrical industry. Conductive aluminum alloys type E-AlMgSi (Aldrey) are representatives of this group of alloys.One of the promising areas for the use of aluminum is the electrical industry. Conducting aluminum alloys of the E-AlMgSi type (Aldrey) are representatives of this group of alloys. The paper presents the results of a study of the temperature dependence of heat capacity, heat transfer coefficient, and thermodynamic functions of an aluminum alloy E-AlMgSi (Aldrey) with gallium. Research conducted in the “cooling” mode. It is shown that the temperature capacity and thermodynamic functions of the E-AlMgSi alloy (Aldrey) with gallium increase, while the Gibbs energy decreases. Gallium additives up to 1 wt.% Reduce the heat capacity, enthalpy, and entropy of the initial alloy and increase the Gibbs energy.

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Hou, Qinghua, Raj Mutharasan e Michael Koczak. "Feasibility of aluminium nitride formation in aluminum alloys". Materials Science and Engineering: A 195 (junho de 1995): 121–29. http://dx.doi.org/10.1016/0921-5093(94)06511-x.

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Moldovan, Petru, Gabriela Popescu e Marilena Cuhutencu. "The Combined Effect of Modifier and Grain Refiner AlTiBSr Master Alloy on Microstructure and Porosity of Aluminum Alloys". Materials Science Forum 526 (outubro de 2006): 223–28. http://dx.doi.org/10.4028/www.scientific.net/msf.526.223.

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The aim of the paper is to present the influence of a new multifunctional material, a master alloy named Al-Sr-Ti-B, in aluminum foundry alloys. The Al-Sr-Ti-B master alloy represents a new combination of two master alloys, already known in aluminum industry, AlTiB and AlSr, used in treatment of aluminum alloys for grain refining and modification. As Strobloy, our master alloy contain fast dissolving SrAl4 particles and also nucleating particles as TiB2 and (Al,Ti)B2 which are important first in modification and second in grain refining of aluminum alloys. The paper presents optic and electron microscopy studies realized on AlSi7Mg alloy treated with this new multifunctional material

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Zhao, Pengfei, Zimu Shi, Xingfu Wang, Yanzhou Li, Zhanyi Cao, Modi Zhao e Juhua Liang. "A Review of the Laser Cladding of Metal-Based Alloys, Ceramic-Reinforced Composites, Amorphous Alloys, and High-Entropy Alloys on Aluminum Alloys". Lubricants 11, n.º 11 (8 de novembro de 2023): 482. http://dx.doi.org/10.3390/lubricants11110482.

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As one of the lightest structural metals, the application breadth of aluminum alloys is, to some extent, constrained by their relatively low wear resistance and hardness. However, laser cladding technology, with its low dilution rate, compact structure, excellent coating-to-substrate bonding, and environmental advantages, can significantly enhance the surface hardness and wear resistance of aluminum alloys, thus proving to be an effective surface modification strategy. This review focuses on the topic of surface laser cladding materials for aluminum alloys, detailing the application background, process, microstructure, hardness, wear resistance, and corrosion resistance of six types of coatings, namely Al-based, Ni-based, Fe-based, ceramic-based, amorphous glass, and high-entropy alloys. Each coating type’s characteristics are summarized, providing theoretical references for designing and selecting laser cladding coatings for aluminum alloy surfaces. Furthermore, a prediction and outlook for the future development of laser cladding on the surface of aluminum alloys is also presented.

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Koizumi, Shohei, Junya Kobayashi e Goroh Itoh. "Deformation Characteristics of 6066 and 6069 Aluminum Alloys at Elevated Temperatures". Materials Science Forum 838-839 (janeiro de 2016): 267–71. http://dx.doi.org/10.4028/www.scientific.net/msf.838-839.267.

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Currently liners of high-pressure hydrogen storage container for fuel cell vehicles are manufactured from the 6061 aluminum alloy pipes through spinning at elevated temperatures. Since the surroundings of the containers are reinforced with a large amount of high-cost CFRP, the use of 6066 or 6069 aluminum alloy with higher strength than 6061 is demanded to lower the cost of the container. However, the formability of these aluminum alloys at elevated temperatures has not been elucidated yet. In this study, tensile deformation characteristics of 6066 and 6069 aluminum alloys at temperatures ranging from 25 to 550°C were investigated. The total elongation of 6066 aluminum alloy was higher than that of 6069 aluminum alloy at 450°C. This may be caused by the lower volume fraction of constituent particles. The flow stresses of the two alloys were almost the same, and were decreased with increasing testing temperature. The increase in elongation and decrease in strength observed in the two alloys were attributable to dynamic recovery.

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Kwak, Z., S. Rzadkosz, A. Garbacz-Klempka, M. Perek-Nowak e W. Krok. "The Properties of 7xxx Series Alloys Formed by Alloying Additions". Archives of Foundry Engineering 15, n.º 2 (1 de junho de 2015): 59–64. http://dx.doi.org/10.1515/afe-2015-0039.

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Abstract Currently there is a constant development in the field of aluminium alloys engineering. This results from, i.a., better understanding of the mechanisms that direct strengthening of these alloys and the role of microalloying. Now it is microalloying in aluminum alloys that is receiving a lot of attention. It affects substantially the macro- and microstructure and kinetics of phase transformation influencing the properties during production and its exploitation. 7xxx series aluminum alloys, based on the Al-Zn-Mg-Cu system, are high-strength alloys, moreover, the presence of Zr and Sr further increases their strength and improves resistance to cracking. This study aims to present the changes of the properties, depending on the alloy chemical composition and the macro- and microstructure. Therefore, the characteristics in the field of hardness, tensile strength, yield strength and elongation are shown on selected examples. Observations were made on ingot samples obtained by semi-continuous casting, in the homogenized state. Samples were prepared from aluminum alloys in accordance with PN-EN 573-3: 2013. The advantage of Al-Zn-Mg-Cu alloys are undoubtedly good strength, Light-weight and resistance to corrosion. As widening of the already published studies it is sought to demonstrate the repeatability of the physical parameters in the whole volume of the sample.

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Mandley, Varinder, e Mamta Janagal. "Methodology to Reduce Casting Defects of Alluminium alloy using Post Heat Treatment". CGC International Journal of Contemporary Technology and Research 2, n.º 1 (30 de dezembro de 2019): 77–80. http://dx.doi.org/10.46860/cgcijctr.2019.12.20.77.

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In early years with the expansion of industries and growth of technology, the usage of aluminum and its alloys is also expanding. Therefore It is additionally utilized in aviation and vehicle industries because of their low thickness, good hardness property, great mechanical properties, better consumption opposition and low coefficient of extension when compared with other metals and alloy. The initial step of assembling in the aluminum combinations begins with the throwing strategy in light of the fact that the underlying throwing structure importantly affects the achievement of thermo-mechanical properties. The initial step of manufacturing in the aluminium alloys is the casting method . The casting structure has an important effect on the success of thermo-mechanical properties. The quality of aluminum amalgams can be dictated by its size and microstructure highlights of circulation all through the throwing procedure. In this way, it is essential to characterize throwing parameters of the aluminum compounds examples for controlling the microstructure properties and throwing abandons. This paper depends on the strategy to evacuate throwing abandons and improve the hardness of the aluminum composites.

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Wu, Zhipeng, Shan Wang e Nan Zhen. "Corrosion Behavior of 7075 and 2A12 Aluminum Alloys in Different Water Environments". Journal of Physics: Conference Series 2101, n.º 1 (1 de novembro de 2021): 012082. http://dx.doi.org/10.1088/1742-6596/2101/1/012082.

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Abstract The corrosion of 7075 and 2A12 aluminium alloys are studied in three types of water, including freshwater lake water, salt lake water and saline lake brine in the Qinghai-Tibet Plateau region. The samples are immersed into the different water for different time, which are divided into four types of 30d, 60d, 90d and 120d. After undergoing dry and wet cycle immersion corrosion under natural conditions, it can be concluded that the two aluminum alloy samples have more serious corrosion in freshwater lakes, and 2A12 aluminum alloy is more corrosion resistant than the 7075 aluminum alloy. The corrosion is mainly pitting, accompanied by crevice corrosion and galvanic corrosion. Cl − can pass through the passivation film on the surface of the samples to form pitting pits, while the dissolved Al 3+ in the matrix and S O 4 2 − in the water can form stable Al 2(SO 4)3 ▪ xH 2 O, which plays a certain protective role for the sample.

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Katz, N. G., I. D. Ibatullin e S. N. Parfenova. "EFFICIENCY OF TREAD ALLOYS FOR VERTICAL STEEL TANKS". Petroleum Engineering 21, n.º 5 (9 de novembro de 2023): 192–97. http://dx.doi.org/10.17122/ngdelo-2023-5-192-197.

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The article discusses the use of various protector alloys made of magnesium and aluminum to protect vertical steel tanks when storing oil and oil products. Characteristics of protector alloys made of magnesium or aluminium and their alloys are shown. Data on the rate of selfdissolution of protector alloys depending on the degree of mineralization of bottom water are given. Gravimetric tests were used to calculate the mass index of the corrosion rate and electrochemical tests were used to calculate the efficiency of the anode current density. An empirical equation is shown by which the self-dissolution rate of protector alloys made of aluminum and magnesium alloys can be calculated, and empirical coefficients are given for the case of using protector alloys considered in the work. The obtained empirical dependence will make it possible to predict the rate of self-dissolution of aluminum and magnesium protector alloys. The efficiency of magnesium and aluminum protector alloys was analyzed and the dependence of the efficiency factor on the anode current density for magnesium and aluminum protector alloys was shown. Shows the effectiveness of using aluminum protector alloys to protect vertical steel tanks. It was concluded that the use of aluminum protector alloys is more efficient, since their efficiency is higher than that of magnesium alloys, this is clearly seen in the graph presented in the work on the dependence of the efficiency on the total mineralization of bottom water. The results of the work can be used in the design of protector protection for vertical steel tanks pre-designated for storage of oil and oil products containing produced water of various salinity.

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Mitiaiev, O. A., e O. L. Skuibida. "IMPROVING THE QUALITY OF ALUMINUM ALLOYS METHODS OF REFINING AND MODIFICATION". Science and Transport Progress, n.º 29 (25 de outubro de 2009): 195–97. http://dx.doi.org/10.15802/stp2009/14098.

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An object under research was the refined and modified secondary aluminum alloy АК9М2. An opportunity to improve the quality of secondary aluminum-based alloys up to the level of primary aluminum alloys has been determined experimentally.

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Marinković, Jelena, e Ljubica Radović. "Influence of retrogression and re-aging treatment on mechanical properties of the alloy EN AW 7049A-T6". Scientific Technical Review 71, n.º 1 (2021): 8–14. http://dx.doi.org/10.5937/str2101008m.

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Aluminum alloys of 7xxx series have the highest strength among all aluminium alloys, but they are prone to the corrosion-induced damage. The retrogression and re-aging heat treatment (RRA) is a heat treatment process applied on the 7xxx series aluminum alloy in T6 temper condition to provide a significant improvement of the corrosion resistance with or without small loss in its strength. The paper presents the influence of RRA treatment on the electrical conductivity and mechanical properties of the aluminum EN AW 7049A-T6 alloy. The retrogression heat treatment was performed at various temperatures (from 180 C to 280 C) and times (from 3 min to 45 min), while re-aging was performed at 120 °C for 24 hours. It has been found that with increasing both temperature and time of retrogression, hardness and strength decrease but the toughness of the alloy increases in comparison to the initial T6 temper. Contrary to hardness values, electrical conductivity rises with an increase in holding time and temperature of retrogression.

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Guo, Hong Min, e Xiang Jie Yang. "Rheoforging of Wrought Aluminum Alloys". Solid State Phenomena 141-143 (julho de 2008): 271–76. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.271.

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Wrought aluminum alloys have wide variety applications in aerospace and automobile industries, due to their superior properties compared to casting aluminum alloys. Rheoforging is a modification of thixoforging, which starts directly from the liquid phase instead of reheating of a billet. In the present process, suitable semi-solid slurries of wrought aluminum alloys are prepared by the LSPSF (low superheat pouring with a shear field) rheocasting process within 25s. The effects of processing conditions on the degree of spherical grain refinement in 2024, 6082 and 7075 alloys are discussed. 2024 and 7075 alloys have been used in order to investigate rheoformability of high performance aluminum alloy. Experimental results show that rheoforging based on LSPSF process can produce relatively homogeneous microstructure throughout the cup-shaped component. However, high solid fraction of semi-solid slurry promotes metal flow and results in solid/liquid segregation. Subsequent optimized heat treatments raise significantly the mechanical properties. Future potentials and challenges to be solved are discussed.

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Kumar, J. Suresh, M. Siva, N. Suneel Kumar, CH V. V. S. S. R. Krishna Murthy e V. V. Ravi Kumar. "Forming of AA2xxx and AA7xxx Sheet Alloys and their Studies on Microstructural and Mechanical Properties of Cold and Cryo Rolled Aluminum Alloys". Materials Science Forum 969 (agosto de 2019): 546–51. http://dx.doi.org/10.4028/www.scientific.net/msf.969.546.

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High strength aluminum alloys will enhancing mechanical properties always plays a major role in controlling microstructure of cast and processed alloy. The desire for more efficient aircraft materials has fueled research of aluminum AA-2xxx and AA7xxx alloys. In these alloys were rolled at cold rolling and at cryorolling to 80 % thickness reductions and an attempt was made to evaluate the optical-microstructural variation and the variation in tensile properties of these aluminum alloys. Cryorolled alloy also exhibited better hardness and strength compared to cold alloy due to suppressed thermal recovery. Coldrolled alloy showed more necking percentage compared to cryorolled for rolling reductions of 80% and more formability was observed.

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KAJIYAMA, Tsuyoshi, e Kazuhiro FUKADA. "Aluminum-manganese and aluminum-manganese-Magnesium alloys." Journal of Japan Institute of Light Metals 38, n.º 6 (1988): 362–73. http://dx.doi.org/10.2464/jilm.38.362.

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