Segregation of Particles and its Influence on the Morphology of the Eutectic Silicon Phase in A;-7 wt. percent Si Alloys

摘要

A new modification phenomenon is reported for Al-Si alloys, where the Al-Si eutectic is refined by segregated TiB_2 particles. The TiB_2 particles are pushed to the Al-Si phase boundary during solidification of the eutectic and it is believed that at high concentrations the TiB_2 particles restrict solute redistribution causing refinement of the Si.