研究了未变质处理和变质处理的AZ91D镁合金在半固态等温热处理过程中的组织演变,并对其组织演变机理进行了探讨.结果表明:AZ91D镁合金在液-固相区570℃等温处理时,未变质处理的δ相由粗大的树枝晶演变为大块状,随后δ相发生熔化分离,并在半固态等温过程中演变为球状,初生相最小尺寸可达50～80μm;变质处理的初生δ相由等轴晶演变为小块状,随后进一步熔化分离为更细小的块状,接着逐渐演变为球状组织,初生相最小尺寸可达20～60μm.等温处理时间过长时,两种组织都会发生合并长大.
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