A deformation-processed Al-matrix/Ca-nanofilamentary composite with low density, high strength, and high conductivity

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:690

Article

Tian, Liang¹  Russell, Alan^2,3  Riedemann, Trevor³  Mueller, Soeren⁴  Anderson, Iver^2,3 

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

[3] US DOE, Ames Lab, Ames, IA 50011 USA

[4] Tech Univ Berlin, Gustav Meyer Allee 25, D-13355 Berlin, Germany

关键词: Metal matrix composite (MMCs);    Powder processing;    Severe plastic deformation;    Strength;    Electrical resistivity/conductivity;   

DOI  :  10.1016/j.msea.2017.03.010

来源: Elsevier

【 摘 要 】

Light, strong materials with high conductivity are desired for many applications such as power transmission conductors, fly-by-wire systems, and downhole power feeds. However, it is difficult to obtain both high strength and high conductivity simultaneously in a material. In this study, an Al/Ca (20 vol%) nanofilamentary metal metal composite was produced by powder metallurgy and severe plastic deformation. Fine Ca metal powders (similar to 200 mu m) were produced by centrifugal atomization, mixed with pure Al powder, and deformed by warm extrusion, swaging, and wire drawing to a true strain of 12.9. The Ca powder particles became fine Ca nanofilaments that reinforce the composite substantially by interface strengthening. The conductivity of the composite is slightly lower than the rule-of-mixtures prediction due to minor quantities of impurity inclusions. The elevated temperature performance of this composite was also evaluated by differential scanning calorimetry and resistivity measurements.

【 授权许可】

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