Abstract
TiB2 particle-reinforced 7075 Al alloy was synthesized to investigate the effect of TiB2 particles on microstructure of semisolid 7075 Al alloy slurry. The mean grain size and shape factor of 3 wt% TiB2/7075 composite could reach 92 μm and 0.64 at 630 °C for 23 min, respectively, and for 6 wt% TiB2/7075 composite, they are 100 μm and 0.64 at 630 °C for 33 min. The microstructure evolution for TiB2/7075 composites in semisolid state includes three-stage process. α-Al begins to nucleate and grow up into rosette grains due to a low degree of supercooling at first. Then rosette grains begin to fuse or grow up at different rates. Finally, the dissolution rate and the growth rate of α-Al reach equilibrium.
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