Al alloys and Al matrix composites produced by powder metallurgy (PM)have been receiving more attention than conventional melting-casting methods in aerospace,military and car industries, due to the improved physical,chemical and mechanical
properties [1–3]. The large surface area of fine Alor Al alloy
powders makesit possible to introduce naturally formed ultrathin and dense surface oxides,which cannot be reduced to Al [4].
The oxide film will hinder metallurgical bonding between the
powder particles and cause the formation of voids during the
sintering process of the green compacts [5]. Thus,it is difficult to
obtain fully dense Al alloys and Al matrix composites with clean
and sharp interfaces.In particular,low wettability and in-
homogeneous distribution ofceramic reinforcements are the main
issues in the Al matrix composites(AMCs)preparation.The refore,
the world widef fort has been to develop as hort pressing-sin-
tering processtoob tain high performance Al alloys and Al matrix
composites