通过金相分析、XRD、SEM及TEM等分析手段,研究了AZ91D镁合金热处理状态下的相结构变化,结果表明:AZ91D镁合金在420℃固溶保温20 h,β-Mg<,17>Al<,12>几乎全部分解,Al原子以置换固溶的形式进入到Mg基体中;175℃时效保温不同的时间,随着时效保温时间的延长,析出相的析出方式和形态都发生变化.TEM观察发现,时效18 h的AZ91D镁合金中存在着短柱状的析出相,β-Mg<,17>Al<,12>与α-Mg之间存在着[011]<,β>//[13 42]<,α>的位向关系.
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