A novel method to control agglomeration of ultrafine YAl2 particles in YAl2p/MgLiAl composite

A MgLiAl matrix composite reinforced with modified ultrafine YAl2 particles was developed by stirring casting in which YAl2 particles were modified by milling YAl2 and Mg particles The effects of milling on the microstructures of YAl2 particles and the dispersity of YAl2 particles in YAl2-Mg mixture were investigated The microstructures and mechanical properties of the composite were presented The results show that after mix milling elemental magnesium exists around YAl2 particles and YAl2 particles distribute homogeneously in YAl2-Mg mixture YAl2-Mg mix milling is greatly beneficial to control agglomeration of ultrafine YAl2 reinforcement in matrix and the reinforcement is uniformly distributed in the matrix The tensile strength of the 5 vol % YAl(2)p/MgLiAl composite increases by 90% as compared to the matrix alloy while the elongation is keep at 7% Crown Copyright (C) 2010 Published by Elsevier B V All rights reserved