SEMI-SOLID FORMING OF A390 HYPER-EUTECTIC ALUMINUM ALLOY

摘要

Strain-introduced A390 hyper-eutectic aluminum alloy specimens were press-formed at their semi-solid temperatures and their microstructural changes, heat treatment characteristics and tensile properties were investigated. Fine and spherical solid particles of α phase can be obtained on heating to the semi-solid temperature, and the particles distribute uniformly by semi-solid forming at 565°C using 15% strain-introduced bulk. A specimen having such microstructure indicates a similar age hardening to as-cast specimen and relatively high tensile strength as compared with that formed at other semi-solid temperatures.