OALib Journal期刊
ISSN: 2333-9721
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Al-Zn-Li-Mg-Cu合金在433K的时效行为
, PP. 19-22
Keywords: Al-Zn-Li-Mg-Cu合金,沉淀硬化
Abstract:
采用透射电镜(TEM)和Vickers硬度计研究了Al-Zn-Li-Mg-Cu合金在433K的人工时效行为.结果表明,在等温时效动力学曲线上存在双阶段硬化行为.第一阶段硬化起因于合金基体上沉淀析出的δ′相(AlLi),时效强化效果来自δ′相;随着时效的进行,到达第二时效硬化峰,在合金基体上除了δ′相外,大量析出一种具有准晶结构的沉淀硬化相(命名为X相),此时,时效强化效果来自δ′相和X相.在X相的周围存在无δ′相析出区,表明X相含有Li原子.X相呈棒状,棒的长轴与基体的〈110)Al方向一致.EDS测试表明,X相富集Cu,Zn和Mg.
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