Artigos de revistas: "Aluminum Metallurgy"

1

Hildeman, Gregory J., e Michael J. Koczak. "Aluminum Powder Metallurgy". JOM 38, n.º 8 (agosto de 1986): 30–32. http://dx.doi.org/10.1007/bf03257784.

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Kustov, A. D., e O. G. Parfenov. "High-speed aluminum metallurgy". Doklady Chemistry 462, n.º 2 (junho de 2015): 149–51. http://dx.doi.org/10.1134/s0012500815060075.

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Takeda, Yoshinobu, Yusuke Odani e Tetsuya Hayashi. "Powder metallurgy of aluminum alloys." Bulletin of the Japan Institute of Metals 27, n.º 10 (1988): 789–96. http://dx.doi.org/10.2320/materia1962.27.789.

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4

Bolaños-Bernal, Sergio Esteban, e Irma Angarita-Moncaleano. "Graphene reinforced aluminum matrix composite obtaining by powder metallurgy". ITECKNE 16, n.º 2 (16 de dezembro de 2019): 18–24. http://dx.doi.org/10.15332/iteckne.v16i2.2353.

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Several researchers have reported graphene as an ideal reinforcement for composite materials due to its interesting properties [1]. The graphene-reinforced aluminium matrix composite material was obtaining by powder metallurgy. This study investigated the effect of aluminum powder morphology on compaction capacity and mechanical strength of composite material. Different milling times were used to determine the optimal time required in manufacturing. The proper compaction load was determined change its values and analyzing the effect of the different loads on the characteristics of the composite. Sintering parameters were established according to previous studies employed by other researchers. Finally, it is determined that with 0.5% wt graphene presents phenomena of grain refinement and higher electrical conductivity of the compound with respect to powder metallurgical aluminum.

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5

TAKEDA, Yoshinobu. "A prospect of aluminum powder metallurgy." Journal of Japan Institute of Light Metals 37, n.º 10 (1987): 639–45. http://dx.doi.org/10.2464/jilm.37.639.

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6

Pramanik, Dipankar. "Aluminum-Based Metallurgy for Global Interconnects". MRS Bulletin 20, n.º 11 (novembro de 1995): 57–60. http://dx.doi.org/10.1557/s0883769400045590.

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In an integrated circuit (IC), the global interconnects are used to run power and ground to the individual transistors as well as to send signals across the chip. The width of interconnects can vary, depending on the current that is carried by the interconnect. Figure 1 shows a cross section of a double-metal complementary metal oxide semiconductor (CMOS) circuit illustrating the major components of a multilevel metallization circuit. The global interconnect connects to the diffusion and polysilicon gates through the contacts. The intermetal dielectric electrically separates the different levels of interconnect. The connection between the global interconnects at adjacent levels is made through the vias. The choice of a global interconnect for a multilevel metallization forces one to consider how the interaction between the various components of this system can affect the performance of the interconnect. For example, the intermetal dielectric changes the mechanical stress in the interconnect; the presence of W plugs in vias can affect the electromigration resistance of interconnects. In this article, we will examine the problems that are encountered when using Al alloys as a global interconnect and illustrate how the material properties can be modified to solve these problems.

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Kulkarni, G. J., D. Banerjee e T. R. Ramachandran. "Physical metallurgy of aluminum-lithium alloys". Bulletin of Materials Science 12, n.º 3-4 (setembro de 1989): 325–40. http://dx.doi.org/10.1007/bf02747140.

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8

Donaldson, I. W. "High Thermal Conductivity Aluminum Powder Metallurgy Materials". Materials Science Forum 783-786 (maio de 2014): 120–25. http://dx.doi.org/10.4028/www.scientific.net/msf.783-786.120.

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High thermal conductivity aluminum has special advantages for electronic packaging and thermal management applications because of the combination of excellent thermal conductivity and relatively low density. Recent development of new press-and-sinter aluminum materials with low levels of alloying that sinters to a high density yielding a high thermal conductivity approaching the theoretical value for pure aluminum. The sintered materials possess thermal conductivity (TC) exceeding 200 w/m-oK (typically 215 – 230 w/m-oK), which makes it unique, since cast and wrought aluminum materials typically fall below 175 w/m-oK. This allows the benefits of powdered metal for low cost manufacturing at high volumes of parts to be realized. This unique combination of low cost and high TC makes these materials an attractive alternative to higher TC materials such as copper. In addition, a metal matrix composites (MMCs) press and sinter approach to tailoring the coefficient of thermal expansion (CTE) can also be used.

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9

Jiang, Z., C. Lucien Falticeanu e I. T. H. Chang. "Warm Compression of Al Alloy PM Blends". Materials Science Forum 534-536 (janeiro de 2007): 333–36. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.333.

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With the onging trend of reducing the weight of automotive parts, there is also an increasing trend in the use of light alloys. Recently, aluminum powder metallurgy has been the subject of great attention due to the combination of the lightweight characteristics of aluminium and the efficient material utilisation of the powder metallurgical process, which offer attractive benefits to potential end-users. Conventional press and sinter route of non-ferrous P/M products are based compaction at room temperature prior to the sintering cycle. However, warm compaction process has successfully provided increased density in ferrous powder metallurgy parts, which contributes to better mechanical properties and consequently overall performance of those parts. This study is aimed at exploring the use of warm compaction process to aluminium powder metallurgy. This paper presents a detailed study of the effect of warm compression and sintering conditions on the resultant microstructures and mechanical properties of Al-Cu-Mg-Si PM blend.

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10

TSUCHIDA, Shigeo. "Degassing and consolidation in aluminum powder metallurgy." Journal of Japan Institute of Light Metals 37, n.º 10 (1987): 656–64. http://dx.doi.org/10.2464/jilm.37.656.

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11

Bora, Anil, P. P. Singha, P. S. Robi e A. Srinivasan. "Powder metallurgy processing of ruthenium aluminum alloys". Journal of Materials Processing Technology 153-154 (novembro de 2004): 952–57. http://dx.doi.org/10.1016/j.jmatprotec.2004.04.155.

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12

Gonza´lez-Carrasco, J. L., F. Garci´a-Cano, G. Caruana e M. Lieblich. "Aluminum/Ni3Al composites processed by powder metallurgy". Materials Science and Engineering: A 183, n.º 1-2 (junho de 1994): L5—L8. http://dx.doi.org/10.1016/0921-5093(94)90914-8.

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13

Barrera, E. V., J. Sims e D. L. Callahan. "Development of fullerene-reinforced aluminum". Journal of Materials Research 10, n.º 2 (fevereiro de 1995): 366–71. http://dx.doi.org/10.1557/jmr.1995.0366.

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Powder metallurgy and casting have been used to produce aluminum with 1.3, 4, and 8 vol. % fullerene additions. Fullerene extract was mixed with Al and heat-treated to obtain various levels of dispersion of the fullerenes. Intergranular dispersion of stable fullerenes was accomplished by both powder metallurgy and casting; however, x-ray diffraction indicated the formation of some Al4C3. Homogeneous dispersion did not occur because of limited diffusion in the solid state or limited solubility of fullerene in Al in the liquid state. Enhancements in hardness over that for Al were observed yet were not comparable to precipitation hardened Al alloys since a less homogeneous dispersion was achieved. Interest in Al having fullerene additions is for development of fullerene strengthened materials where fullerenes act as nanosize dispersoids for dispersion strengthening of metals or as a lightweight reinforcement in metal-matrix composites.

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14

Behera, Rajesh Kumar, Birajendu Prasad Samal e Sarat Chandra Panigrahi. "Manufacture of die and their designing parameters for sintered AMC product". Matériaux & Techniques 107, n.º 6 (2019): 605. http://dx.doi.org/10.1051/mattech/2020009.

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The main goal in the advancement of composites with an aluminum metal matrix is to provide high performance and better mechanical properties from the currently available materials. Aluminium metal composite (AMC) can be researched and used in many industrial applications, such as manufacturing, aerospace, defense, pipelines and the automotive industry. The production of AMC is only possible with help of a suitable die in solid route of powder metallurgy process. Thus, the design of die is most important step in the process of powder metallurgy. The shape, size and design of the die directly influence the final AMC product. A number of steps and considerations like stress concentration and the propagation of cracks should be made for designing the die before its manufacture. The present work is made to attempt the fabrication and design of a cold compaction die with EN 10083 steel used for powder metallurgy process.

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15

Khamsuk, Sunisa, K. Choosakull e P. Wanwong. "Effect of Space Holder Size on the Porous High Purity Aluminum Property". Key Engineering Materials 846 (junho de 2020): 93–98. http://dx.doi.org/10.4028/www.scientific.net/kem.846.93.

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Porous high purity aluminum was fabricated using a powder metallurgy route combined with the space holder technique. The high purity aluminum powder was mixed with three different particle sizes and contents of the space holder material. The mixed powders were cold compacted at 400 MPa and sintered at 550 °C. The effects of space holder size on the microstructure and mechanical properties of porous high purity aluminum were systematically studied. Results revealed that the size and content of the space holder materials have a significant effect on the mechanical properties of porous aluminium. The compressive strength and hardness of the porous aluminum increased as the size and amount of the space holder material increased and decreased, respectively. The thickness of the cell wall increased with an increase particle size of the space holder material.

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16

Otsuki, Masato, Koichi Yuri e Tohru Kohno. "Cavitation Erosion Characteristics of Powder Metallurgy Aluminum Alloys." Journal of the Japan Society of Powder and Powder Metallurgy 41, n.º 8 (1994): 922–26. http://dx.doi.org/10.2497/jjspm.41.922.

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17

Campbell, John B. "An advance in powder metallurgy aluminum alloy etchants". Metallography 18, n.º 4 (novembro de 1985): 413–20. http://dx.doi.org/10.1016/0026-0800(85)90009-6.

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18

Ekvall, J. C., e D. J. Chellman. "Ingot metallurgy aluminum-lithium alloys for aircraft structure". Journal of Aircraft 24, n.º 4 (abril de 1987): 255–61. http://dx.doi.org/10.2514/3.45434.

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19

Mishra, R. S., T. R. Bieler e A. K. Mukherjee. "Superplasticity in powder metallurgy aluminum alloys and composites". Acta Metallurgica et Materialia 43, n.º 3 (março de 1995): 877–91. http://dx.doi.org/10.1016/0956-7151(94)00323-a.

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20

Webster, D. "Aluminum-lithium powder metallurgy alloys with improved toughness". Metallurgical Transactions A 19, n.º 3 (março de 1988): 603–15. http://dx.doi.org/10.1007/bf02649274.

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21

Perepelitsyn, V. A., V. A. Proshkin, V. M. Rytvin, V. G. Ignatenko, I. A. Yarosh e A. N. Abyzov. "Non-traditional domestic refractory materials for aluminum metallurgy". Refractories and Industrial Ceramics 49, n.º 4 (julho de 2008): 257–60. http://dx.doi.org/10.1007/s11148-008-9090-7.

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22

Awad, Mahmoud, Noha M. Hassan e Sathish Kannan. "Mechanical properties of melt infiltration and powder metallurgy fabricated aluminum metal matrix composite". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 235, n.º 13 (10 de maio de 2021): 2093–107. http://dx.doi.org/10.1177/09544054211015956.

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Metal foams have drawn an increasing interest especially in applications where weight and energy absorption are critical. Despite the extensive studies available on their characterization and enhanced fabrication techniques, limited work was found on the possibility of producing a porous composite foam. The objective of this article is to investigate two new synthesis techniques for manufacturing metal matrix composite foam that is, powder metallurgy and melt infiltration. Both techniques are studied using Sodium Chloride (NaCl) as a space holder in an aluminum-based metal matrix and graphene nanoparticles as reinforcements. The effect of the quantity added of both the space holder and graphene is studied using designed experiments. Although powder metallurgy provided lower baseline hardness, experimentation results suggest the superiority of the process over melt infiltration in terms of porosity and hardness. Results suggest that baseline aluminum hardness can be increased by up to 21.5% using powder metallurgy and 15% using melt infiltration. In terms of porosity, powder metallurgy porosity increased baseline more than ten folds while melt infiltration only doubled the baseline porosity. Moreover, it is easier to control the macroscopic shape, density, and distribution of the pores using powder metallurgy. It is also easier to disperse the reinforcement homogenously. Results will support several industries such as military, automotive, medical, and aerospace in developing this innovative material with superior properties and coping with their need for advanced applications.

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23

Tiryakioğlu, Murat. "Intrinsic and Extrinsic Effects of Microstructure on Properties in Cast Al Alloys". Materials 13, n.º 9 (25 de abril de 2020): 2019. http://dx.doi.org/10.3390/ma13092019.

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The metallurgy of cast aluminum alloys has always been considered to be different from that of wrought alloys. Metallurgists have been taught that pores are intrinsic in cast aluminum alloys and that mechanical properties in cast aluminum alloys are controlled by dendrite arm spacing, the presence of Fe-bearing particles, and the size of Si particles in Al–Si alloys, which fracture and debond during deformation, leading to premature failure. Whether these effects are intrinsic or extrinsic, i.e., mere correlations due to the structural quality of castings, is discussed in detail. Ideal properties are discussed, based on findings presented mostly in physics literature. Pores and hot tears in aluminum castings are extrinsic. Moreover, the effect of dendrite arm spacing on elongation, precipitation, and subsequent fracture of β–Al5FeSi platelets, and finally Si particle fracture and debonding are all extrinsic. A fundamental change in how we approach the metallurgy of cast aluminum alloys is necessary.

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24

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 (junho de 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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Zhu, Wan Bo, Zheng Gui Zhang, Hao Nan Chen e Tie Xiao. "Review and Outlook of Aluminum Matrix Composites". Materials Science Forum 984 (abril de 2020): 119–24. http://dx.doi.org/10.4028/www.scientific.net/msf.984.119.

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In the past 20 years, the development of aluminum matrix composites (AMCs) has made a qualitative leap. This article comprehensively introduces the performance characteristics and the preparation methods of aluminum matrix composites. The powder metallurgy method (P/M) is elaborated in detail. And the applications of aluminum matrix composites in aerospace, automobile and other fields are described. Finally, the future development of aluminum matrix composites is prospected.

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26

Pourali, Omid, Hashem Ghasemi Kadijani e Farideh Mohammadi Khangheshlaghi. "Chemical conditioning and monitoring to control and minimize chemistry-related damages in Heller dry cooled combined cycle power plants". Anti-Corrosion Methods and Materials 64, n.º 2 (6 de março de 2017): 188–208. http://dx.doi.org/10.1108/acmm-02-2016-1648.

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Purpose An effective chemical conditioning technique was successfully tested and investigated to control and minimize the chemistry-related damages within mixed metallurgy steam and water cycle of Heller dry cooled combined cycle power plants (CCPPs), in which cooling water and condensate are completely mixed in direct contact condenser. This study aims to perform a comprehensive experimental research in four mixed metallurgy steam and water cycle. Design/methodology/approach A comprehensive experimental study was carried out in four mixed metallurgy steam and water cycle fabricated with ferrous- and aluminum-based alloys which have various corrosion resistance capabilities in contact with water. Chemical conditioning was conducted using both volatile and non-volatile alkalizing agents, and, to perform chemical conditioning effectively, quality parameters (pH, conductivity, dissolved oxygen, sodium, silica, iron, aluminum and phosphate) were monitored by analyzing grab and online samples taken at eight key sampling points. Findings Results indicated that pH was the most critical parameter which was not mainly within the recommended ranges of widely used standards and guidelines at all key sampling points that generally increases the occurrence of chemistry-related damages. The other quality parameters were mostly satisfactory. Originality/value In this research, the development of a suitable chemical conditioning technique in mixed metallurgy steam and water cycle, fabricated with ferrous and aluminum-based alloys, was studied. The obtained results in this thorough research work was evaluated by comparison with the chemistry limits of the widely used standards and guidelines, and combined use of volatile and solid alkalizing agents was considered as a promising chemical conditioning technique for utilization in mixed metallurgy units of Heller dry cooled CCPPs.

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27

Sunada, S., e N. Nunomura. "Electrochemical Impedance Characteristics of Sintered 7075 Aluminum Alloy Under Ssrt Condition". Archives of Metallurgy and Materials 58, n.º 2 (1 de junho de 2013): 505–8. http://dx.doi.org/10.2478/amm-2013-0027.

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Powder metallurgy (P/M) process has the advantage of better formability to fabricate complex shape products without machining and welding. And recently this P/M process has been applied to the production of aluminum alloys. The P/M aluminum alloys thus produced also have received considerable interest because of their fine and homogeneous structure. Many papers have been published on the mechanical properties of the aluminum alloys produced by P/M process while there have been few on their corrosion properties from the view point of electrochemistry. In this experiment, therefore, two kinds of 7075 aluminum alloys prepared by the conventional ingot metallurgy (I/M) process and P/M process were used, I/M material is commercially available. and their corrosion behavior were investigated through the electrochemical tests such as potentiodynamic polarization test, slow rate strain tensile (SSRT) test and electrochemical impedance spectroscopy (EIS) measurement under SSRT test in the corrosion solution and the deionized water.

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Luo, Hong Jie, Hao Lin, Jian Kun Zhang e Guang Chun Yao. "Al-Si Alloy Foam Prepared by Two Step Foaming Method". Materials Science Forum 817 (abril de 2015): 42–47. http://dx.doi.org/10.4028/www.scientific.net/msf.817.42.

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Two basic methods can be used to fabricate aluminum foam. One is powder metallurgy route which can provide the near net shape casting containing aluminum foam core, and the other is melt foaming route which can prepare large scale aluminum foam plate directly. To combine the advantages of above two methods, the precursor was obtained through melt foaming route and then baked in a furnace like that of powder metallurgy method in this investigation. The test results indicated that the SiC and TiH2 particles after treatment in air could be dispersed in Al-Si matrix alloy melt and the precursors were obtained. The porosity and their pore diameter of the precursors decreased along with the temperature reducing as well as the magnesium or SiC particles adding. The density of Al-Si alloy foam decreased with the elevation of baking temperature and extension of heating time before collapse of foam block occurred. The foaming process parameters were seriously affected by the aluminum alloy composition.

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29

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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Cojocaru, Mihai Ovidiu, Mihaela Raluca Condruz e Florică Tudose. "Consolidation Features of Aluminum-Alumina Compositions by Powder Metallurgy Methods". Solid State Phenomena 254 (agosto de 2016): 110–15. http://dx.doi.org/10.4028/www.scientific.net/ssp.254.110.

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In this paper was followed the processing flow of aluminum-alumina compositions (10÷20% alumina) in powder state, aiming to obtain aluminum matrix composites reinforced with alumina particles, starting from selecting and mixing the grading fraction of both components reaching up to sintering; it was analyzed the way in which reflects the variation of grading fraction ratio (expressed through average particle diameter in the analyzed fractions limits) on the level of technological interest features: apparent density, tapped density, flowability, presability and on densification after sintering (in various environments). By transmission electron microscopy was observed that aluminum particles showed on the surface a nanoscale oxide film, so the sintering occurs between congeneric areas – by solid phase sintering mechanisms [1, 2, 3]. The analysis of thermophysical properties revealed a decrease of thermal diffusivity at an increase of alumina, simultaneous with the decrease of the densification level.

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Kuz’min, M. P., M. Yu Kuz’mina, Jia Q. Ran, A. S. Kuz’mina e A. E. Burdonov. "The use of carbon-containing wastes of aluminum production in ferrous metallurgy". Izvestiya. Ferrous Metallurgy 63, n.º 10 (10 de dezembro de 2020): 836–41. http://dx.doi.org/10.17073/0368-0797-2020-10-836-841.

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The article discusses the prospects of recycling the most massive wastes of aluminum production (namely, used cathode blocks of electrolyzers, gas treatment dust, gas treatment residue, and flotation tailing). It have been indicated the volumes of wasteaccumulation and a special attention has been focused on the need of their disposal with a view to improve the environmental conditions of the territories adjacent to the industrial zones. Specific characteristics of the generated waste have been determined, which indicate the possibility of their secondary use and transfer from waste to by-products.Existing technical solutions relevant to the issue have been reviewed, and the reasons preventing their implementation have been explained. The most promising methods of waste processing to be carried out successfully in the current economic conditions have been identified. Spent cathode blocks can be used at ferrous metallurgy enterprises (in blast furnaces and converters) as a substitute for expensive coke and fluorspar, and finely dispersed waste can be used at cement enterprises. The areas have been determined that in the future will significantly increase the volume of processing and the demand for these wastes of the aluminum industry in technological processes of ferrous metallurgy. The possibilities for cooperation between aluminum refineries and ferrous metallurgy enterprises, as well as other related industries, were emphasized in detail.

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Hayashi, Tetsuya, e Kentaro Azetsu. "Development of Aluminum Powder Metallurgy Composites for Cylinder Liner." Journal of the Japan Society of Powder and Powder Metallurgy 48, n.º 5 (2001): 426–31. http://dx.doi.org/10.2497/jjspm.48.426.

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Koizumi, Takuya, Kota Kido, Kazuhiko Kita, Koichi Mikado, Svyatoslav Gnyloskurenko e Takashi Nakamura. "Foaming Agents for Powder Metallurgy Production of Aluminum Foam". MATERIALS TRANSACTIONS 52, n.º 4 (2011): 728–33. http://dx.doi.org/10.2320/matertrans.m2010401.

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Research Association Of Aluminum Po e Yoshinobu TAKEDA. "Achievement of the research association of aluminum powder metallurgy." Journal of Japan Institute of Light Metals 40, n.º 2 (1990): 145–55. http://dx.doi.org/10.2464/jilm.40.145.

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Sigli, Christophe, H. Vichery e B. Grange. "Computer Assisted Metallurgy for Non Heat Treatable Aluminum Alloys". Materials Science Forum 217-222 (maio de 1996): 391–96. http://dx.doi.org/10.4028/www.scientific.net/msf.217-222.391.

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Xie, Zhen-kai, Yasuo Yamada e Takumi Banno. "Mechanical Properties of Microporous Aluminum Fabricated by Powder Metallurgy". Japanese Journal of Applied Physics 45, No. 32 (11 de agosto de 2006): L864—L865. http://dx.doi.org/10.1143/jjap.45.l864.

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Jamal, N. A., O. Maizatul, H. Anuar, F. Yusof, Y. Ahmad Nor, K. Khalid e M. N. Zakaria. "Preliminary development of porous aluminum via powder metallurgy technique". Materialwissenschaft und Werkstofftechnik 49, n.º 4 (abril de 2018): 460–66. http://dx.doi.org/10.1002/mawe.201700269.

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Rack, H. J. "FABRICATION OF HIGH PERFORMANCE POWDER-METALLURGY ALUMINUM MATRIX COMPOSITES". Advanced Materials and Manufacturing Processes 3, n.º 3 (janeiro de 1988): 327–58. http://dx.doi.org/10.1080/08842588708953210.

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Chen, J. K., e I. S. Huang. "Thermal properties of aluminum–graphite composites by powder metallurgy". Composites Part B: Engineering 44, n.º 1 (janeiro de 2013): 698–703. http://dx.doi.org/10.1016/j.compositesb.2012.01.083.

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Buasri, Achanai, Chudeth Prasanwon, Bhornwalan Boonsong, Pantira Kohprasert e Vorrada Loryuenyong. "The Fabrication of Graphene-Reinforced Aluminum Composites by Powder Metallurgy and Uniaxial Pressing". Key Engineering Materials 780 (setembro de 2018): 10–14. http://dx.doi.org/10.4028/www.scientific.net/kem.780.10.

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This research studied the fabrication of graphene-reinforced aluminum composite via powder metallurgy and uniaxial pressing. The process started from mixing graphene with aluminum powder with various content of graphene (0.5, 1, 1.5, 2 and 4 wt.%) in acetone medium, followed by dispersion process at high frequency using an ultrasonic bath. The mixed composite powders were then formed into pellet and sintered at 600°C. The results showed that when graphene content in graphene reinforced aluminum composite is low (0.5wt.%, 1wt.% and 1.5wt.%), the hardness was enhanced. It was suspected that graphene could get into aluminum matrix and impede the grain growth of aluminum and dislocation movement. However, when excessive graphene content was added, graphene nanoplatelets tended to agglomerate, decreasing the hardness of composite. Similarly, the improvement of electrical and thermal conductivities was achieved with a low content of graphene. The well dispersion of graphene in aluminum matrix could facilitate the electron transport and to induce the pore reduction throughout the matrix.

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Baghchesara, Mohammad Amin, Hossein Abdizadeh e Hamid Reza Baharvandi. "Effects of MgO Nano Particles on Microstructural and Mechanical Properties of Aluminum Matrix Composite prepared via Powder Metallurgy Route". International Journal of Modern Physics: Conference Series 05 (janeiro de 2012): 607–14. http://dx.doi.org/10.1142/s201019451200253x.

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The objective of the present investigation was to evaluate the microstructural and mechanical properties of Al /nano MgO composite prepared via powder metallurgy method. Pure atomized aluminum powder with an average particle size of 1μm and MgO particulate with an average particle size between 60 to 80 nm were used. Composites containing 1.5, 2.5 and 5 percent of volume fraction of MgO were prepared by powder metallurgy method. The specimens were pressed by Cold Isostatic Press machine (CIP), subsequently were sintered at 575, 600 and 625°C. After sintering and preparing the samples, mechanical properties were measured. The results of microstructure, compression and hardness tests indicated that addition of MgO particulates to aluminum matrix composites improves the mechanical properties.

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Chebotarev, A. G., e D. D. Sementsova. "Comprehensive Assessment of Working Conditions and Occupational Disease Rates at Mining and Metallurgical Enterprises". Mining Industry Journal (Gornay Promishlennost), n.º 1/2021 (15 de março de 2021): 114–19. http://dx.doi.org/10.30686/1609-9192-2021-1-114-119.

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The paper presents the results of hygienic assessment of the working environment and work process factors at surface and underground ore mining operations, ferrous metallurgy plants and aluminum production facilities. It has been established that workers are affected by a complex of production factors (dust, toxic substances, noise, vibration, unfavorable micro climate, etc.), the level of which often exceeds the hygienic standards. The workplace conditions of the primary jobs at these enterprises in 60-80% of cases are classified as hazardous, i.e. Class 3 of various hazard degrees. The incidence of occupational diseases remains high, especially in underground mining and at aluminum production plants. The specific features of mining and metallurgical operations and the severity of unfavorable production factors determine the structure of occupational morbidity. Occupational respiratory diseases are most common among workers in the ferrous metallurgy industry and account for 70.3% in total. Vibration-induced pathologies are most frequently diagnosed among excavator, bulldozer and dump truck operators, and account for 52.9% of all the diagnosed occupational diseases. Hearing organ pathology in the form of neurosensory loss of hearing among workers of mining and metallurgical enterprises ranges from 10.2% (aluminum smelters) to 22.7% (ferrous metallurgy plants) in the occupational morbidity structure. Chronic intoxication with fluorine compounds at aluminum smelters was diagnosed in 68.1% of cases. The results obtained confirm the pressing need to improve the working conditions, introduce preventive measures based on the primary prevention principles, and reduce the risk factors of health problems among the workers.

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Uzun, A. "Compressive Crush Performance of Square Tubes Filled with Spheres of Closed-Cell Aluminum Foams". Archives of Metallurgy and Materials 62, n.º 3 (26 de setembro de 2017): 1755–60. http://dx.doi.org/10.1515/amm-2017-0267.

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AbstractThis paper describes the compressive crush behaviour of spheres of closed-cell aluminium foams with different diameters (6, 8 and 10 mm) and square tubes filled with these spheres. The spheres of closed-cell aluminium foams are net spherical shape fabricated via powder metallurgy methods by heating foamable precursor materials in a mould. The square tubes were filled by pouring the spheres of closed-cell aluminium foams freely (without any bonding). The compressive crush performance of square tubes filled with spheres of closed-cell aluminum foams were compared to that of the empty tubes. The results show a significant influence of the spheres of closed-cell aluminium foam on the average crushing load of the square tubes. The energy absorption in the square tube filled with spheres of closed-cell aluminium foam with diameters of 10 mm is higher than in the other square tubes. The spheres of closed-cell aluminium foams led to improvement of the energy absorption capacity of empty tubes.

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Dong, Kai Xin, Chao Yuan, Shuang Gao e Jian Ting Guo. "Oxidation Behavior of a Disk Powder Metallurgy Superalloy". Materials Science Forum 898 (junho de 2017): 467–75. http://dx.doi.org/10.4028/www.scientific.net/msf.898.467.

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Oxidation behaviors of a spray-forming disk superalloy LSHR were investigated in the temperature range of 750-900°C. The composition and morphology of oxidation scales were investigated by X-ray diffraction (XRD), scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS), and electron probe microanalysis (EPMA). Oxidation kinetics was studied by the means of isothermal oxidation testing in air and weight gain measurement. The oxide scales were composed of Cr2O3, TiO2, Al2O3 and a small amount of NiCr2O4. The experiment results showed that oxidation kinetics and oxide layers followed a square power law as time extended from 750 to 900°C. With the oxidation temperature increasing, external scale thickness, and internal oxidation zone increased. The oxidation behavior was controlled by the diffusion of oxygen, chromium, titanium, and aluminum ions, as chromium, titanium, and aluminum ions diffused outward and oxygen diffused inward. Based on the standard HB5258-2000 spray-forming LSHR exhibited an excellent oxidation resistance in the whole test temperature range.

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Veillère, Amélie, Hiroki Kurita, Akira Kawasaki, Yongfeng Lu, Jean-Marc Heintz e Jean-François Silvain. "Aluminum/Carbon Composites Materials Fabricated by the Powder Metallurgy Process". Materials 12, n.º 24 (4 de dezembro de 2019): 4030. http://dx.doi.org/10.3390/ma12244030.

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Aluminum matrix composites reinforced with carbon fibers or diamond particles have been fabricated by a powder metallurgy process and characterized for thermal management applications. Al/C composite is a nonreactive system (absence of chemical reaction between the metallic matrix and the ceramic reinforcement) due to the presence of an alumina layer on the surface of the aluminum powder particles. In order to achieve fully dense materials and to enhance the thermo-mechanical properties of the Al/C composite materials, a semi-liquid method has been carried out with the addition of a small amount of Al-Si alloys in the Al matrix. Thermal conductivity and coefficient of thermal expansion were enhanced as compared with Al/C composites without Al-Si alloys and the experimental values were close to the ones predicted by analytical models.

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Sarmah, Ankita, Siddhartha Kar e Promod Kumar Patowari. "Surface modification of aluminum with green compact powder metallurgy Inconel-aluminum tool in EDM". Materials and Manufacturing Processes 35, n.º 10 (1 de junho de 2020): 1104–12. http://dx.doi.org/10.1080/10426914.2020.1765253.

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Vani, Vemula Vijaya, e Sanjay Kumar Chak. "The effect of process parameters in Aluminum Metal Matrix Composites with Powder Metallurgy". Manufacturing Review 5 (2018): 7. http://dx.doi.org/10.1051/mfreview/2018001.

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Metal Matrix Composites are developed in recent years as an alternative over conventional engineering materials due to their improved properties. Among all, Aluminium Matrix Composites (AMCs) are increasing their demand due to low density, high strength-to-weight ratio, high toughness, corrosion resistance, higher stiffness, improved wear resistance, increased creep resistance, low co-efficient of thermal expansion, improved high temperature properties. Major applications of these materials have been in aerospace, automobile, military. There are different processing techniques for the fabrication of AMCs. Powder metallurgy is a one of the most promising and versatile routes for fabrication of particle reinforced AMCs as compared to other manufacturing methods. This method ensures the good wettability between matrix and reinforcement, homogeneous microstructure of the fabricated MMC, and prevents the formation of any undesirable phases. This article addresses mainly on the effect of process parameters like sintering time, temperature and particle size on the microstructure of aluminum metal matrix composites.

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Wei, Li, e Yu Sun. "Study on Bubble's Stability in Process of Preparing Foam Aluminum by Powder Metallurgy Method". Advanced Materials Research 146-147 (outubro de 2010): 370–73. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.370.

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In this paper, the bubble’s stability is studied in the process of preparing foam aluminum by powder metallurgy. In this work, carborundum particles, soot powder and carbon fiber are added into pure aluminum powder, respectively. The microstructure of cell wall of foam aluminum, the viscosity and surface tension of melt is investigated. It is discussed the bubble stability which is controlled through adding SiC particles, soot powder and carbon fiber, and the mechanism of bubble’s stability is analyzed. The experiment results showed that the homogeneity of bubble holes of foam aluminum is better than that which is obtained by adding SiC practical and carbon fiber into the raw materials. SEM images showed that SiC particles and carbon fiber distribute evenly on cell wall of foam aluminum. It means that during foaming a lot of SiC particles and carbon fiber distribute diffusively in liquid aluminum melted. It increases the viscosity of melt so that stability of bubble is increased.

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Gallego Parra, Samuel, Mihai Alin Pop, Tibor Bedő e Virgil Geamăn. "Thixoforming and Powder Metallurgy - A Comparative Study and Practical Case". Materials Science Forum 907 (setembro de 2017): 193–97. http://dx.doi.org/10.4028/www.scientific.net/msf.907.193.

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Pistons are commonly made of a cast aluminum alloy for excellent and lightweight thermal conductivity. Thermal conductivity is the ability of a material to conduct and transfer heat. Aluminum expands when heated and proper clearance must be provided to maintain free piston movement in the cylinder bore. The piston transforms chemical energy of the burned fuel into a mechanical energy. For this reason, the pistons are submitted to a complex combination of thermal stresses and high temperature mechanical cycles. In this study both powder metallurgy (PM) and thixoforming techniques are used to process a metallic matrix composite (MMC) as a promising material for pistons. Aluminum as matrix and copper powder, to enhance thermal conductivity, and glass fiber, which increases Young’s modulus and a lower thermal expansion coefficient, as reinforcement, are obtained for this aim. The optical microscope images showed in this study are a clear example of the distribution of the glass fiber in the matrix. These results can be the basis for new researches to develop and to obtain materials for new advanced materials for pistons.

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Jamaludin, Shamsul Baharin, Josef Hadipramana, Mohd Fitri Mohd Wahid, Kamarudin Hussin e Azmi Rahmat. "Microstructure and Interface Analysis of Glass Particulate Reinforced Aluminum Matrix Composite". Advanced Materials Research 795 (setembro de 2013): 578–81. http://dx.doi.org/10.4028/www.scientific.net/amr.795.578.

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A characterization of microstructure and interface was made on the composites Al-4 % Cu reinforced with 15 wt. % glass particulate. The composite was fabricated by powder metallurgy followed by solution treatment and artificial ageing. The microstructures of the composite showed that the glass particulates were in-homogenously distributed in the matrix and segregated near copper. The aluminum oxide layer was found between aluminum, copper and glass particulate. Micro cracks were observed in the aluminum oxide layer and at the interface between aluminum oxide layer and aluminum. Hardness increased as ageing time increased. Interface behavior and aging time influenced the hardness of the composite.

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