Mechanical alloying for the preparation of nano-aluminum nitride-reinforced aluminum matrix composites
The AlN/Al nanocomposites were prepared by conventional powder mixing and mechanical alloying meth-ods(MA),and their microstructures,macroscopic properties,and microscopic defects were analyzed.The results show that both the conventional powder mixing process and high-energy MA process of nmAlN/Al can effectively enhance the strength of pure aluminum matrix;the high-energy MA process can make nmAlN uniformly dispersed in Al matrix in a relatively short time and effectively inhibit the tendency of agglomeration of nano-ceramic particles;however,with the enhancement of MA,the densification and flexural strength of the material show a decreasing trend.Excessive MA causes a rapid increase in the density of micro defects within the nmAlN/Al composite parti-cles to the order of 109,thus reducing the sinterability of the composite powder and hence the composite properties.
powder metallurgyaluminum matrix compositesnano-aluminum nitridemechanical alloyingdisloca-tion density
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万方数据
维普
