期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 629, 期 -, 页码 184-187出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.12.220
关键词
Nitride materials; Metal matrix composites; Gas-solid reaction; Mechanical properties
Full and partial nitridation of Al powders were obtained by heating commercial pure Al powders at different temperatures for different time under pressure-less H-2 and N-2 atmosphere. Then the fully nitrided powders were wet ball milled to prepare AlN powders while the partially nitrided powders were consolidated, and then extruded into AlN/Al composites. In-situ formation of AlN on the surface of Al powders was successfully controlled in the nitridation process. AlN dispersoids transformed from particle-like to needle-like, and finally to fully reacted AlN clusters consisted of their nano-scale fine particles. As a result, AlN powders with a mean particle size of about 200 nm and a purity of 98.63 wt% could be prepared, and AlN/Al composites with adjustable combinations of strength and elongation can be fabricated as well. (C) 2015 Elsevier B.V. All rights reserved.
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