Characterization of microstructure and properties of Al�?�Al$_3$Zr�?�Al$_2$O$_3$ composite

[摘要] Aluminium-based metal matrix composite strengthened by in situ Al$_2$O$_3$ and Al$_3$Zr particles were synthesized by powder metallurgy route. Phase analysis by X-ray diffraction and scanning electronmicroscopy revealed that the reaction between Al and ZrO$_2$ produced Al$_2$O$_3$ and Al$_3$Zr phases in the sintered composites. The hardness of the composite is a strong function of sintering temperature as well as the volume fraction of reinforcements. The dry sliding wear test results clearly indicated that increasing the volume fraction of zirconia particles in the compositeimproved the wear resistance. Microcutting, ploughing, delamination and oxidation were the main mechanisms of wear.

[学科分类] 材料工程

[关键词] Metal matrix composite;hardness;wear;scanning electron microscopy.