Al-Zn-Mg-Cu合金组织和电导率及抗应力腐蚀性能研究Study of microstructure,electrical conductivity and stress corrosion resistance of Al-Zn-Mg-Cu alloys
宁爱林,刘志义,冯春,曾苏民
摘要(Abstract):
研究了三种Al-Zn-Mg-Cu合金在回归再时效状态下的组织、电导率与抗应力腐蚀性能的关系。结果表明,电导率≥35.46%IACS的合金均表现出良好的抗应力腐蚀性能与较高的拉伸强度,晶界组织为粗大分立的η相,晶内为均匀弥散的GP区和η′相;而电导率≤34.63%IACS的合金虽然拉伸强度较高,但抗应力腐蚀性能较低,晶界组织为尺寸较小的链状η相。分析表明,相对常规T73等过时效状态的高电导率(38%~42%IACS),回归再时效状态弥散的晶内组织导致了较低的电导率和高抗拉强度,但粗大分立的晶界析出相仍然使其获得了优良的抗应力腐蚀性能,从而使合金表现出电导率适中(35.46%~36.82%IACS)、抗应力腐蚀性能良好和拉伸强度高的特点。
关键词(KeyWords): 回归再时效;铝合金;电导率;应力腐蚀
基金项目(Foundation): 国家“863”高技术项目(2001AA332030);; 湖南省科技厅重点项目(05GK2018)
作者(Author): 宁爱林,刘志义,冯春,曾苏民
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