通过对AZ系镁合金钨极氩弧焊(TIG)焊接接头进行固溶时效处理,研究其显微组织和显微硬度的变化.结果表明,在时效初始阶段(0～10h),熔合区中Al和Zn元素扩散速度和β-Mg17(Al,Zn)12的体积分数增加较快,其显微硬度随之增加较快.随着时效时间的延长,熔合区中的βMg17(Al,Zn)12的析出逐渐达到饱和,β-Mg17(Al,Zn)12的体积分数不再增加,显微硬度基本不变.
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