2003•The Chinese Journal of Nonferrous MetalsRequires access

Influence of combined melt treatment of Sr + B on microstructure and mechanical properties of Al-Si-Mg casting alloy

Liao Heng

Abstract

The influence of addition of Al 1B master alloy on the microstructure and mechanical properties of Al 11.6%Si 0.4%Mg alloy modified with 0.030%Sr were discussed. It is found that the Al B master alloy has a very strong power of refining dendrite in near eutectic Al Si casting alloys. The mechanical properties and the fractographs of the alloy as cast and after T6 heat treatment by three different melt treatments (no modifying+no refining, 0.030%Sr modifying, 0.030% Sr modifying+ 0.028%B refining) were also compared. It is concluded that the combined melt treatment of Sr+B is very necessary and important to improve the mechanical properties of the near eutectic Al Si casting alloys, especially the ductility.

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Key concepts: Materials science, Eutectic system, Alloy, Microstructure, Refining (metallurgy), Casting, Metallurgy, Dendrite (mathematics)