分别熔炼了含Li和不含Li的2种7XXX系合金,合金经过双级时效(120℃+160℃)后,利用TEM研究了第二级时效峰值状态时的微观组织.结果表明,2种合金的沉淀强化相均是η′(MgZn2).与不含Li合金相比,含Li合金具有更细小的析出强化相和更窄的沉淀无析出带(PFZs).
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