You are here

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

TitleA deformation-processed Al-matrix/Ca-nanofilamentary composite with low density, high strength, and high conductivity
Publication TypeJournal Article
Year of Publication2017
AuthorsTian, L, Russell, A, Riedemann, T, Mueller, S, Anderson, I
JournalMaterials Science and Engineering a-Structural Materials Properties Microstructure and Processing
Volume690
Pagination348-354
Date Published04
Type of ArticleArticle
ISBN Number0921-5093
Accession NumberWOS:000399511400038
Keywords&, deformation, Electrical resistivity/conductivity, Materials Science, Metal matrix composite (MMCs), metal-metal composites, Metallurgical Engineering, Microstructure, Powder processing, Severe plastic, strength, Technology - Other Topics
Abstract

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.

DOI10.1016/j.msea.2017.03.010
Custom 1

AlCa Composites

Alternate JournalMater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.