Abstract：The nmAlN/Al composites were prepared by conventional powder mixing and mechanical alloying methods (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 of nmAlN/Al 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 particles to the order of 109, thus reducing the sinterability of the composite powder and hence the composite properties.
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2024, Vol. 31 