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 make sit 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
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 mechanicalproperties [1–3]. The large surface area of fine Alor Al alloypowders make sit 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 thepowder particles and cause the formation of voids during thesintering process of the green compacts [5]. Thus,it is difficult toobtain fully dense Al alloys and Al matrix composites with cleanand sharp interfaces.In particular,low wettability and in-homogeneous distribution ofceramic reinforcements are the mainissues 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 matrixcomposites
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