对AlSi7Mg合金(A356)半固态压铸件和液态压铸件进行了不同工艺的固溶与时效热处理,分析了其显微组织与疏松度,测定了硬度、拉伸强度及延伸率等力学性能.实验得出,铝合金半固态压铸件原始态的力学性能优于液态压铸件,并且半固态压铸件时效强化效果尤其明显,拉伸强度可达330MPa以上,延伸率10%以上.这主要是由于半固态压铸件比液压件具有更加致密,且为球状的非树枝晶组织.铝合金半固态压铸件时效强化,机理主要归于弥散析出Mg2Si强化相.
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