Abstract
A semisolid microstructure of Mg 2Si/Al composite is successfully achieved by isothermal heat treatment process, and the effects of holding temperature on semisolid microstructure of the composites are investigated. The result shows that, at the low heat treatment temperature, the morphology of primary Mg 2Si particles are identified as irregular shape and α-Al grains exhibit elliptic and/or rosette type, and their sizes are non-uniform from 35 to 130 μm and 41 to 191 μm, respectively. With the increasing of treatment temperature, the morphologies of primary Mg 2Si and α-Al grains change to spherical type, and their sizes decrease and become relatively uniform.
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