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Articoli di riviste sul tema "Nickel-aluminum alloys"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 11 febbraio 2022

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1

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. 2 (30 giugno 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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2

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. 2 (15 settembre 2019): 34–41. http://dx.doi.org/10.53671/ptukrj.v7i2.76.

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Abstract (sommario):

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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3

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. 2 (15 settembre 2019): 34–41. http://dx.doi.org/10.53671/pturj.v7i2.76.

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Abstract (sommario):

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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4

Hernández-Méndez, F., A. Altamirano-Torres, José G. Miranda-Hernández, Eduardo Térres-Rojas e Enrique Rocha-Rangel. "Effect of Nickel Addition on Microstructure and Mechanical Properties of Aluminum-Based Alloys". Materials Science Forum 691 (giugno 2011): 10–14. http://dx.doi.org/10.4028/www.scientific.net/msf.691.10.

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In this work a comparative study between microstructure and mechanical properties of aluminum-nickel alloys with different contents of nickel was carried out. Alloys were produced by powders metallurgy. Characterization results indicates that the microstructure of the aluminum-nickel alloys present a thin and homogeneous distribution of an intermetallic compound in the aluminum’s matrix, identified as Al3Ni. Furthermore, it was find out that the amount of intermetallic Al3Ni increase as the nickel content in the alloy rises. Regarding the mechanical properties evaluated; it was establishes that the hardness, compression and flexion resistances also were improved due to the presence of the intermetallic compound.

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5

Saadeddine, S., J. F. Wax, B. Grosdidier, J. G. Gasser, C. Regnaut e J. M. Dubois. "Structure Factors of Binary Aluminum-Nickel and Ternary Aluminum-Nickel-Silicon Liquid Alloys". Physics and Chemistry of Liquids 28, n. 4 (dicembre 1994): 221–30. http://dx.doi.org/10.1080/00319109408030252.

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6

Ramunni, Viviana P. "Diffusion behavior in Nickel–Aluminum and Aluminum–Uranium diluted alloys". Computational Materials Science 93 (ottobre 2014): 112–24. http://dx.doi.org/10.1016/j.commatsci.2014.06.039.

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7

Khakimov, Iskandar B., Firuz A. Rakhimov, Izatullo N. Ganiev e Ziyodullo R. Obidov. "OXIDATION KINETIC AND ANODIC BEHAVIOR OF Zn22Al ALLOY DOPED WITH NICKEL". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, n. 6 (15 maggio 2021): 35–40. http://dx.doi.org/10.6060/ivkkt.20216406.6368.

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The article presents the results of the study of the oxidation kinetics and the anodic behavior of the zinc-aluminum alloy Zn22Al, doped with nickel, in various corrosive environments. The kinetic and energy parameters of the process of high-temperature oxidation of alloys are determined. It is shown that the process of high-temperature oxidation of samples of Zn22Al-Ni alloys is characterized by a monotonic decrease in the true oxidation rate and an increase in the effective activation energy at the content of the alloying component in the initial Zn0.5Al alloy up to 0.5 wt.%. It was found that nickel additives within the studied concentration (0.01-0.5 wt.% ) slightly increases the oxidability of the base alloy Zn22Al at temperatures of 523, 573 and 623 K. It is shown that the dependence of the corrosion potential of zinc-aluminum alloys on the nickel content in them is of the same type, i.e. the additives of the alloying component contribute to the displacement of the corrosion potential in the region of positive values. The influence of the aggressiveness of the corrosive medium on the anodic behavior of alloys when comparing concentrated electrolytes with the increasing concentration of chloride ions in the sodium chloride solution is established. It is determined that the potentials of pitting formation and repassivation of the initial alloys shift to a more positive region with an increase in the nickel concentration in the alloys. The greatest shift of these potentials to the positive region is observed when alloying alloys containing small nickel additives. It is shown that the corrosion products of the studied alloys consist of a mixture of protective oxide films Al2O3, ZnO, NiO, Al2O3·ZnO and Al2O3·Ni2O3. It was found that the alloying of zinc-aluminum alloys with nickel (in the range of 0.01–0.05 wt.%) reduces the corrosion rate of the base alloy by 2-3 times. The proposed alloy compositions can be used as an anode coating for corrosion protection of steel products and structures.

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8

Taher, Abulmaali M. "Effect of Alloying Elements on the Hardness Property of 90% Copper-10% Nickel Alloy". Materials Science Forum 872 (settembre 2016): 13–17. http://dx.doi.org/10.4028/www.scientific.net/msf.872.13.

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The objective of this study is to investigate the effect of adding some alloying elements (including iron, aluminum, chromium, cobalt, and titanium) to 90 wt. % copper – 10 wt. % nickel alloy on the hardness property. Copper-nickel synthetic alloys were prepared in an induction furnace, in an argon/7% vol. hydrogen atmosphere in cylindrical boron nitride crucibles. They were then homogenized at 950°C for 10 hours in the same protective atmosphere. Vickers hardness measurements, microstructure examination, and Energy Dispersive Spectrometry (EDS) mapping analysis were performed for all synthetic alloys. Hardness measurements results show that the addition of all the alloying elements used in this investigation improve the hardness of the 90 wt. % copper – 10 wt. % nickel alloy. It was concluded that the aluminum was the most effective alloying element on the hardness value for 90 wt. % copper – 10 wt.% nickel alloy.

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9

Rybalka, Konstantin V., Luiza A. Beketaeva, Vyacheslav S. Shaldaev, Nataliya G. Bukhan’ko e Alexey D. Davydov. "Electrochemical Behavior of Nickel-Aluminum Alloys in Sodium Chloride Solutions". Advanced Materials Research 138 (ottobre 2010): 7–20. http://dx.doi.org/10.4028/www.scientific.net/amr.138.7.

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The anodic and cathodic reactions involved in the corrosion process on several nickel-aluminum alloys including two intermetallic compounds NiAl and Ni3Al in the NaCl solutions are studied. A procedure of pretreatment of test specimens and measuring the anodic and cathodic voltammograms is developed. It enabled us to obtain reproducible results including Tafel portions of voltammograms. The corrosion potentials Ecorr and corrosion currents icorr are determined by the coordinates of the intersection of anodic and cathodic Tafel plots. The dependences of Ecorr and icorr on the alloy composition (the content of nickel in the binary nickel-aluminum alloys), on the concentration of NaCl, and рН of unbuffered NaCl solutions with the additions of HCl or NaOH are determined. The anodic behavior of the alloys in a wide potential range is studied using the potentiodynamic method and the method of stepwise raising anodic potential with an exposure of electrode at each potential for a certain time. The dependences of pitting potential on the concentration of solution are determined for two intermetallic compounds.

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10

Huang, Yuan Sheng. "Nickel-Diamond Compound Electroless Plating on Cast Aluminum Alloys". Advanced Materials Research 189-193 (febbraio 2011): 265–68. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.265.

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In order to improve both the hardness and the erosion resistance of cast aluminum alloys, nickel-diamond compound coatings were deposited on the alloys by a compound electroless plating process. The morphology, phase structure, hardness, erosion resistance and adhesion of the electroless coating were investigated. The results show that the pretreatment such as removing the silicon in the surface of the alloys, zinc dipping, alkali electroless nickel is necessary. The deposition of an electroless nickel coating without diamond prior to nickel-diamond electroless plating can improves the erosion resistance. A best nickel-diamond compound electroless plating process is found. The hardness of the nickel-diamond compound coating reaches 730 HV. Both the adhesion and erosion resistance of the compound coatings are very good.

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11

Sobiecki, Jerzy Robert, R. Sitek e Tadeusz Wierzchoń. "The Use of Trimethylaluminum for Producing Surface Layers by the PACVD Method". Materials Science Forum 475-479 (gennaio 2005): 3887–90. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.3887.

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The paper presents the use of trimethylaluminum in PACVD method to obtain the surface layers like alumina or aluminum nitride on Inconel nickel alloy. The glow discharge nitriding at a temperature of 750°C leads to the formation of aluminum oxynitride in the layer, whereas annealing in argon plasma at a temperature of 1050°C – to the formation of nickel and aluminum based intermetallic phases of the NiAl or Ni3Al type with aluminum oxide present within the outer zone of the coating. The presence of the surface layer of the Al2O3+NiAl+Ni3Al type formed on nickel alloys may be significant from the point of view of the applications that require a high heat resistance.

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12

Naeem, Haider T., Kahtan S. Mohammed, Khairel R. Ahmad e Azmi Rahmat. "The Influence of Nickel and Tin Additives on the Microstructural and Mechanical Properties of Al-Zn-Mg-Cu Alloys". Advances in Materials Science and Engineering 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/686474.

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The effects of nickel and nickel combined tin additions on mechanical properties and microstructural evolutions of aluminum-zinc-magnesium-copper alloys were investigated. Aluminum alloys containing Ni and Sn additives were homogenized at different temperatures conditions and then aged at 120°C for 24 h (T6) and retrogressed at 180°C for 30 min and then reaged at 120°C for 24 h (RRA). Comparison of the ultimate tensile strength (UTS) of as-quenched Al-Zn-Mg-Cu-Ni and Al-Zn-Mg-Cu-Ni-Sn alloys with that of similar alloys which underwent aging treatment at T6 temper showed that gains in tensile strengths by 385 MPa and 370 MPa were attained, respectively. These improvements are attributed to the precipitation hardening effects of the alloying element within the base alloy and the formation of nickel/tin-rich dispersoid compounds. These intermetallic compounds retard the grain growth, lead to grain refinement, and result in further strengthening effects. The outcomes of the retrogression and reaging processes which were carried on aluminum alloys indicate that the mechanical strength and Vickers hardness have been enhanced much better than under the aging at T6 temper.

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13

Nascimento, Maurício Silva, Givanildo Alves dos Santos, Rogério Teram, Vinícius Torres dos Santos, Márcio Rodrigues da Silva e Antonio Augusto Couto. "Effects of Thermal Variables of Solidification on the Microstructure, Hardness, and Microhardness of Cu-Al-Ni-Fe Alloys". Materials 12, n. 8 (18 aprile 2019): 1267. http://dx.doi.org/10.3390/ma12081267.

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Aluminum bronze is a complex group of copper-based alloys that may include up to 14% aluminum, but lower amounts of nickel and iron are also added, as they differently affect alloy characteristics such as strength, ductility, and corrosion resistance. The phase transformations of nickel aluminum–bronze alloys have been the subject of many studies due to the formations of intermetallics promoted by slow cooling. In the present investigation, quaternary systems of aluminum bronze alloys, specifically Cu–10wt%Al–5wt%Ni–5wt%Fe (hypoeutectoid bronze) and Cu–14wt%Al–5wt%Ni–5wi%Fe (hypereutectoid bronze), were directionally solidified upward under transient heat flow conditions. The experimental parameters measured included solidification thermal parameters such as the tip growth rate (VL) and cooling rate (TR), optical microscopy, scanning electron microscopy (SEM) analysis, hardness, and microhardness. We observed that the hardness and microhardness values vary according to the thermal parameters and solidification. We also observed that the Cu–14wt%Al–5wt%Ni–5wi%Fe alloy presented higher hardness values and a more refined structure than the Cu–10wt%Al–5wt%Ni–5wt%Fe alloy. SEM analysis proved the presence of specific intermetallics for each alloy.

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14

Jo, Hyunbin, Soomin Lee, Donghyun Kim e Junghoon Lee. "Low Temperature Sealing of Anodized Aluminum Alloy for Enhancing Corrosion Resistance". Materials 13, n. 21 (31 ottobre 2020): 4904. http://dx.doi.org/10.3390/ma13214904.

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Sealing as a post treatment of anodized aluminum is required to enhance the corrosion resistance by filling nanopores, which allow the penetration of corrosive media toward the base aluminum. We designed a mixed sealing solution with nickel acetate and ammonium fluoride by modifying traditional nickel fluoride cold sealing. The concentration of mixed sealing solution affected the reaction rate of sealing and corrosion current density of anodized aluminum alloy. The higher concentration of mixed sealing solution improved the sealing rate, which was represented by a decrease of corrosion current density of anodized aluminum alloy. However, a mixed sealing solution with 2/3 concentration of general nickel fluoride sealing solution operated at room temperature showed the lowest corrosion current density compared to traditional methods (e.g., nickel fluoride cold sealing (NFCS) and nickel acetate hot sealing) and other mixed sealing solutions. Moreover, the mixed sealing solution with 2/3 concentration of general NFCS had a lower risk for over sealing, which increases the corrosion current density by excessive dissolution of anodic oxide. Therefore, the mixed sealing solution with optimized conditions designed in this work possibly provides a new method for enhancing the corrosion resistance of anodized aluminum alloys.

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15

Tan, Zhengquan, e S. M. Heald. "Interfacial reactions between nickel–chromium alloys and aluminum". Journal of Applied Physics 71, n. 8 (15 aprile 1992): 3766–72. http://dx.doi.org/10.1063/1.350887.

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16

Shaffer, Peter T. B., e Randy R. Donn. "Aluminum nitride refractories for handling high-nickel alloys". JOM 42, n. 3 (marzo 1990): 59. http://dx.doi.org/10.1007/bf03220902.

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17

Dybkov, V. I., E. S. Meshkov, V. V. Kovylyaev e G. Z. Omel'chenko. "Solubility of iron-nickel alloys in liquid aluminum". Soviet Powder Metallurgy and Metal Ceramics 31, n. 7 (luglio 1992): 598–601. http://dx.doi.org/10.1007/bf00793440.

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18

Xing, Qing, Lin Fan, Wei Min Guo, Xiang Xi Chen, Li Hua Gong e Chao Yang. "Galvanic Corrosion of 70-30 Copper-Nickel Alloy in Contact with Nickel-Aluminum Bronze in Simulated Deep Sea Environment". Advanced Materials Research 1095 (marzo 2015): 124–29. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.124.

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Abstract (sommario):

The galvanic corrosion behavior of 70-30 copper-nickel alloy as a brand new seawater pipe material and nickel-aluminum bronze as the commonly used pipe valve material in simulated low temperature conditions of deep sea was studied. The galvanic corrosion potential and galvanic current density of the pair were monitored, and the galvanic corrosion tendency and effect at different temperature were evaluated. Combined with the electrochemical measurements, the influence of seawater temperature on galvanic corrosion behavior was also discussed. The results showed that as the result of coupling, 70-30 copper-nickel alloy acting as the coupled cathode was prevented from corrosion, while nickel-aluminum bronze became the sacrificial anode. With the decrease of seawater temperature, the galvanic corrosion tendency and galvanic corrosion rate of the pair decreased. The change in galvanic corrosion tendency with seawater temperature was attributed to the different electrochemical properties induced by the inherent difference in chemical compositions of the alloys. The low galvanic corrosion rate and effect were related to the reduced mass transfer rates at low temperature. Moreover, the electrochemical behavior of the copper alloys was much sensitive to the change in the amount of dissolved oxygen at the lower seawater temperature, especially for the alloy with higher passivation ability, i.e., 70-30 copper-nickel alloy.

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19

Okamoto, H. "Al-Ni (Aluminum-Nickel)". Journal of Phase Equilibria & Diffusion 25, n. 4 (1 agosto 2004): 394. http://dx.doi.org/10.1361/15477030420232.

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20

Nosova, Ekaterina A., Antonina A. Kuzina e Anna V. Kuts. "Development of the Process of Pseudo-Ligatures Manufacturing from Aluminum and Nickel Powders for the Modification of Alloys". Applied Mechanics and Materials 698 (dicembre 2014): 452–56. http://dx.doi.org/10.4028/www.scientific.net/amm.698.452.

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Compacting after pressing and sintering of briquettes made from an aluminum powder with an average particle size from 50 to 150 microns, the specific surface area Ssp=0.26 m2/g and a nickel powder with an average particle size from 25 to 100 microns, the specific surface area Ssp= 0.03 m2/g has been investigated. Pressing load varied from 15 to 25 MPa for the aluminum powder and from 20 to 45 MPa for the nickel powder. Sintering of aluminum powder briquettes was carried out at temperatures (0.5-0.83) of melting temperature, (0.3-0.46) of melting temperature from the nickel powder. It is shown that the application of high pressure, low temperatures and short time makes it possible to receive pseudo-ligatures from an aluminum powder with porosity about 32% and a nickel powder with porosity about 30%.

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21

Goldman, R. W., A. E. Segall e J. C. Conway. "The Dry Sliding Behavior of Aluminum Alloys Against Steel in Sheave Wheel Applications". Journal of Tribology 123, n. 4 (20 ottobre 2000): 676–81. http://dx.doi.org/10.1115/1.1339981.

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The dry sliding behavior of various 2xxx and 7xxx aluminum alloys with and without nickel-aluminum bronze-coatings were evaluated for industrial sheave wheel applications involving steel cables. In order to simulate the wear caused by a cable within the sheave groove, wear tests were conducted using a pin-on-ring wear test configuration. For these tests, the various aluminum alloys were worn against a 387 steel using an interfacial pressure of 13.9 MPa and a sliding velocity of 9.42 m/s. Results indicated that for the conditions studied, the 7xxx aluminum alloys exhibited a superior wear resistance relative to the 2xxx aluminum alloys with and without nickel-aluminum bronze coatings. A wear mode analysis based upon optical and electron microscopy revealed material removal mechanisms dominated by adhesive and abrasive wear. Moreover, a statistical analysis indicated a potential relationship between wear rate and a combination of yield strength, solidus temperature and post-wear inverse hardness.

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22

Okamoto, H. "Al-Ni (aluminum-nickel)". Journal of Phase Equilibria 14, n. 2 (aprile 1993): 257–59. http://dx.doi.org/10.1007/bf02667823.

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23

Tomolya, Kinga, Dóra Janovszky e Anna Sycheva. "Amorphization of CuZr Based Alloy Powders by Mechanical Milling". Materials Science Forum 790-791 (maggio 2014): 509–14. http://dx.doi.org/10.4028/www.scientific.net/msf.790-791.509.

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The effect of nickel addition was studied in the CuZr system creating alloys with near eutectic composition. Nickel and aluminum have been regarded as useful elements to improve the plasticity, thermal stability of the CuZr-based amorphous alloys. Cu49Zr45Al6and (Cu49Zr45Al6)95Ni5were selected because of the good glass-forming ability. After 15 h of milling the structure of the powders was amorphous based on the XRD analysis. By adding nickel, the crystallization temperature (Tx) shifted to higher temperatures compared to CuZrAl alloy. The value of supercooled liquid region was 64 K, which means CuZrAl has a comparatively high glass forming ability.

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24

SHASHIKALA, A., A. SHARMA e D. BHANDARI. "Solar selective black nickel–cobalt coatings on aluminum alloys". Solar Energy Materials and Solar Cells 91, n. 7 (16 aprile 2007): 629–35. http://dx.doi.org/10.1016/j.solmat.2006.12.001.

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Kuppahalli, Prabhakar, R. Keshavamurthy, P. Sriram e J. T. Kavya. "Microstructural and Mechanical behaviour of Nickel Aluminum Bronze alloys". IOP Conference Series: Materials Science and Engineering 577 (7 dicembre 2019): 012044. http://dx.doi.org/10.1088/1757-899x/577/1/012044.

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26

Zemljakov, S. A., A. M. Guriev, M. A. Guriev e S. G. Ivanov. "Surface hardening of aluminum alloys by chemical nickel plating". Letters on Materials 7, n. 2 (2017): 165–69. http://dx.doi.org/10.22226/2410-3535-2017-2-165-169.

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27

Arbuzov, Aleksey B., Vladimir A. Drozdov, Dmitry A. Shlyapin e Alexander V. Lavrenov. "INTERACTION OF ALUMINUM-COBALT AND ALUMINUM-NICKEL ALLOYS ACTIVATED BY LIQUID GALLIUM-INDIUM EUTECTIC WITH TERT-BUTYL CHLORIDE FOR FORMATION OF CATALYTIC METAL - ALUMO-CHLORIDE COMPLEXES". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, n. 9-10 (22 ottobre 2018): 64–69. http://dx.doi.org/10.6060/ivkkt20186109-10.5862a.

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It is known that binary alloys of aluminum and metals of the iron group (cobalt, nickel) after their activation with the liquid eutectic gallium-indium by the removal of “passivating” oxide layers sharply increase the reactivity with respect to organochlorines. Corresponding reactions lead to the formation of metal – alumo - chloride complexes as inorganic products, which are active in many practically important catalytic reactions of liquid-phase conversion of hydrocarbons such as: alkylation, isomerization, oligomerization. This approach which was previously developed by the authors for the polycrystalline aluminum, is of interest in metal-complex catalysis since the formation of catalytic alumo-chloride and/or metal-alumo-chloride complexes can be carried out directly in the reaction medium, i.e. in situ. In this work, the local composition, structure and morphology of surface layers of aluminum-cobalt and aluminum-nickel alloys activated with liquid gallium-indium eutectic were studied using the methods of scanning electron microscopy and X-ray energy-dispersive spectrometry to determine the physicochemical regularities of the dynamics of their interaction with tert-butyl chloride at room temperatures. The formation of metal chloride complexes in the interphase area “activated alloy - tert-butyl chloride” was studied by ATR-FT-IR method in situ. The results obtained indicate that mono- and bi- nuclear alumo-chloride anions stabilized by cobalt and nickel cations are formed during the interaction. It is assumed that the ionic complex pairs formed are the active centers in liquid-phase reactions of hydrocarbons transformation at low temperatures. These structures are responsible for significantly change in the selectivity of catalytic processes compared to aluminum chloride catalyst. For citation: Arbuzov A.B., Drozdov V.A., Shlyapin D.A., Lavrenov A.V. Interaction of aluminum-cobalt and aluminum-nickel alloys activated by liquid gallium-indium eutectic with tert-butyl chloride for formation of catalytic metal - alumo-chloride complexes. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 9-10. P. 64-69

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Monogenov, A. A., V. E. Gunther, O. A. Ivchenko, A. N. Stebluk, A. A. Radkewich, A. A. Ariamkin e S. G. Shtofin. "Structure and Properties of Porous Alloys Based on NiTi Doped by Al, Fabricated by SHS-method". KnE Materials Science 2, n. 1 (17 luglio 2017): 62. http://dx.doi.org/10.18502/kms.v2i1.781.

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The effect of aluminum doping of porous TiNi-based alloy on structure, penetrability, strength properties and characteristic temperature intervals of martensitic transformations, multiple shape memory effect (MSME) parameters were studied. In this paper porous alloys from mixture of titanium, nickel and aluminum (CAl=0-2.0 at. %) powders were obtained by self propagation high temperature synthesis (SHS-method). Aluminum additives allow to obtain a material which is characterized by an increased content of fine pores 10-20 mm, uniform pore size distribution, an increased level of strength. The optimum concentration of Al to obtain high properties of material was defined. The porous TiNi-based alloys doped with aluminum are promising to solve a number of complex medical problems, such as in vascular surgery and cellular technologies.

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Trzepieciński, Tomasz, Andrzej Trytek e Hirpa G. Lemu. "Study of Frictional Properties of AMS Nickel-Chromium Alloys". Key Engineering Materials 674 (gennaio 2016): 244–49. http://dx.doi.org/10.4028/www.scientific.net/kem.674.244.

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The research reported in this article has considered the frictional characteristics of three kinds of AMS nickel-chromium alloys that are commonly used in aerospace industry. These are alloys with additions of titanium and aluminum AMS5542, nickel-chromium alloy AMS5596, and non-magnetic, corrosion and oxidation resistant, nickel-chromium alloy AMS5599. To determine the friction coefficient two tribological tests, a strip drawing test and a pin-on-disc tribometer have been conducted. Three different friction conditions were considered, dry friction, lubrication conditions using two grades of oils used in sheet metal forming of AMS alloys. The experimental results have ascertained several relationships showing the effect of sheet metal surface roughness, lubricant conditions and sheet orientation on the value of friction coefficient in sheet metal forming processes. Different levels of normal pressure were also used in friction tests. The results further showed that the surface topography and sample orientation in the rolling direction of the sheet are significant factors that influence the friction coefficient. It has been observed that the tested AMS alloys, selected from aerospace industry applications, exhibit anisotropic resistance to the friction corresponding to the measured orientation in relation to the rolling direction of the sheet.

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30

Bennett, J. C., e C. V. Hyatt. "Microstructure of Laser Surface Melted Nickel Aluminum Bronze". Microscopy and Microanalysis 5, S2 (agosto 1999): 868–69. http://dx.doi.org/10.1017/s1431927600017669.

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The copper alloys commonly referred to as nickel aluminum bronzes (NAB) are widely used in marine applications due to their excellent seawater corrosion resistance and good mechanical properties. Unfortunately, these alloys are susceptible to a variety of surface sensitive degradation processes such as cavitation and wear which significantly reduce service life. Laser surface melting and cladding techniques have recently demonstrated a potential to substantially enhance the performance of NAB components. This is associated with the occurrence of a martensitic or Widmanstätten transformation from the high temperature bcc β phase accompanied by precipitation of ordered intermetallic particles collectively referred to as κ. Optimization of these techniques requires an improved understanding of the evolution of microstructure in the NAB system under conditions of rapid solidification, however little data is currently available. In this paper, transmission electron microscopy is used to examine the microstructures of a series of laser surface melted NAB alloys containing from 8 to 12 wt. % Al, 3.8 to 6.5 wt. % Ni, 3.8 to 6.5 wt. % Fe, ∽1 wt. % Mn and, in some cases, lesser amounts of Ti or Zr.

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31

Jarfors, Anders E. W., Andong Du, Gegan Yu, Jinchuan Zheng e Kaikun Wang. "On the Sustainable Choice of Alloying Elements for Strength of Aluminum-Based Alloys". Sustainability 12, n. 3 (2 febbraio 2020): 1059. http://dx.doi.org/10.3390/su12031059.

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Aluminum alloys are today entirely recyclable and are seen as a sustainable material. However, there are limitations in the use of aluminum from material strength and cost perspective. Nickel, copper and rare earth metals are alloying elements that may provide strength at room and elevated temperatures. These are, however, often seen as harmful from a sustainability viewpoint. Additionally, these alloying elements are commonly costly. The current paper makes an analysis of the sustainability–strength dimension of alloying, together with a cost perspective, to guide alloy producers and alloy users in making an educated choice of direction for future materials and material development.

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32

Kravchenko, D. V., I. A. Kozlov e A. A. Nikiforov. "METHODS FOR PREPARING THE SURFACE OF ALUMINUM ALLOYS FOR ELECTROPLATING (review)". Proceedings of VIAM, n. 6 (2021): 82–99. http://dx.doi.org/10.18577/2307-6046-2021-0-6-82-99.

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A review of modern scientific publications in the field of methods for preparing the surface of aluminum alloys for electroplating is presented. It is shown that the most widely used methods of preparation are: zinc treatment, high-porosity anodic oxidation and immersion nickel plating. A number of combined methods for preparing the surface of aluminum alloys for electroplating are given. Methods of direct application of electroplating coatings on aluminum and its alloys without the use of a sublayer, both by electrolytic and chemical methods, are considered.

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33

Fan, Yang Yang, e Makhlouf M. Makhlouf. "Castable Aluminium Alloys for High Temperature Applications". Materials Science Forum 765 (luglio 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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34

Amirkhiz, Babak Shalchi, Dharmendra Chalasani e Mohsen Mohammadi. "TEM Study of Additively Manufactured Metallic Alloys: Nickel Aluminum Bronze". Microscopy and Microanalysis 25, S2 (agosto 2019): 2588–89. http://dx.doi.org/10.1017/s1431927619013679.

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35

Heerman, L. "Electroplating of Nickel-Aluminum Alloys from Room Temperature Molten Chloroaluminates". ECS Proceedings Volumes 1994-13, n. 1 (gennaio 1994): 441–48. http://dx.doi.org/10.1149/199413.0441pv.

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36

Dybkov, V. I., e E. S. Meshkov. "Kinetics of solution of iron-nickel alloys in liquid aluminum". Soviet Powder Metallurgy and Metal Ceramics 31, n. 11 (novembre 1992): 970–72. http://dx.doi.org/10.1007/bf00797628.

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37

Ovcharenko, V. E., Sergei Grigorievich Psakhye e E. N. Boyangin. "Bulk Nanostructured Ni₃Al Intermetallic and Ni₃Al-Base Alloy". Applied Mechanics and Materials 682 (ottobre 2014): 210–15. http://dx.doi.org/10.4028/www.scientific.net/amm.682.210.

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We show here that Ni3Al compound which is widely used as the base metal for advanced multipurpose hot-resistant alloys may be efficiently bulk nanostructured for improving its physical and strength characteristics. Developing the nanostructured component in the bulk of the intermetallic compound is achieved by plastic deformation of an SHS product during its synthesis and crystallization under conditions of thermal explosion of nickel/aluminum powder mixture of stoichiometric composition. It was shown that the nanosize component is formed on the basis of intermetallic Ni3Al synthesized by SHS under hot forging conditions from nickel/aluminum powder mixed with an inert binder component. Developing the nanosize structural components improves strength of the intermetallic alloy.

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38

Ishii, Fujio, Shiro Ban-Ya e Mitsutaka Hino. "Thermodynamics of the Deoxidation Equilibrium of Aluminum in Liquid Nickel and Nickel-Iron Alloys." ISIJ International 36, n. 1 (1996): 25–31. http://dx.doi.org/10.2355/isijinternational.36.25.

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39

Guo, K., Y. Liu, G. Gou, W. Zhang, W. Gao e Wanjng Wang. "Electroplating and brazing joining of 5083 aluminum alloy to CFRP". International Journal of Modern Physics B 33, n. 01n03 (30 gennaio 2019): 1940044. http://dx.doi.org/10.1142/s0217979219400447.

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This study has analyzed the welding joint of carbon fiber reinforced plastics (CFRP) and aluminum alloys. The surface of CFRP and 5083 Al alloy was modified by electroplating with nickel at first. Then the effect of electroplating parameters on coating was explored. SEM images revealed that the coating gradually became well but then began to fall off with the current density and the plating time increased. CFRP and aluminum alloys were brazed at 285[Formula: see text]C and held for 20 s. Shear test was used to evaluate the strength of the joint and the strength was probably 7.56 MPa. SEM and EDS tests showed that there existed diffusion of the elements in the welding process and the joint reached the bonding of atomic or molecular sizes. Thus, this experiment achieved the tight brazing joining between thermoset CFRP and aluminum alloys providing the joining method of the application for CFRP.

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40

Raghavan, V. "Al-Fe-Ni (Aluminum-Iron-Nickel)". Journal of Phase Equilibria & Diffusion 26, n. 1 (1 febbraio 2005): 70–71. http://dx.doi.org/10.1361/15477030522536.

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41

Raghavan, V. "Al-Ni-Si (Aluminum-Nickel-Silicon)". Journal of Phase Equilibria & Diffusion 26, n. 3 (1 giugno 2005): 262–67. http://dx.doi.org/10.1361/15477030523643.

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42

Raghavan, V. "Al-Ni-Ti (Aluminum-Nickel-Titanium)". Journal of Phase Equilibria & Diffusion 26, n. 3 (1 giugno 2005): 268–72. http://dx.doi.org/10.1361/15477030523652.

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43

Raghavan, V. "Al-Ni-V (Aluminum-Nickel-Vanadium)". Journal of Phase Equilibria & Diffusion 26, n. 3 (1 giugno 2005): 273–75. http://dx.doi.org/10.1361/15477030523661.

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44

Raghavan, V. "Al-Co-Ni (Aluminum-Cobalt-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 372–80. http://dx.doi.org/10.1361/154770306x116315.

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45

Raghavan, V. "Al-La-Ni (Aluminum-Lanthanum-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 392. http://dx.doi.org/10.1361/154770306x116333.

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46

Raghavan, V. "Al-Nb-Ni (Aluminum-Niobium-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 397–402. http://dx.doi.org/10.1361/154770306x116351.

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47

Raghavan, V. "Al-Nd-Ni (Aluminum-Neodymium-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 403–4. http://dx.doi.org/10.1361/154770306x116360.

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48

Raghavan, V. "Al-Cr-Ni (Aluminum-Chromium-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 381–88. http://dx.doi.org/10.1361/154770306x116397.

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49

Raghavan, V. "Al-Cu-Ni (Aluminum-Copper-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 389–91. http://dx.doi.org/10.1361/154770306x116405.

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50

Raghavan, V. "Al-Mo-Ni (Aluminum-Molybdenum-Nickel)". Journal of Phase Equilibria & Diffusion 27, n. 4 (1 agosto 2006): 393–96. http://dx.doi.org/10.1361/154770306x116414.

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