锡对铝锌镁铜合金在120℃时效后组织与性能的影响  

Effect of Sn on Microstructure and Property of Al-Zn-Mg-Cu Alloy after Aging at 120 ℃

作　　者：姜荣票[1] 赖建平[1] 刘华山[1] 金展鹏[1] 李晓谦[2] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学机电工程学院,长沙410083

出　　处：《机械工程材料》2012年第7期11-13,37,共4页Materials For Mechanical Engineering

基　　金：国家基础研究计划项目(2010CB731706)

摘　　要：采用透射电子显微镜和维氏显微硬度计研究了锡对铝锌镁铜合金在120℃时效不同时间后组织和性能的影响。结果表明:时效初期,锡能促进GP II区的形成;含锡合金中锡的高空位结合能影响了元素的扩散,导致η′相的粗化被抑制,从而延迟了硬度峰值的出现,而且合金具有更高的硬度。The effects of Sn on microstructure and property of Al-Zn-Mg-Cu alloy after aging at 120℃ for different times were studied by transmission electron microscopy and vickers microhardness measuring. The results show that Sn could promote forming GPII zones at the early stage of aging. The high vacancy binding energy of Sn in the alloy containing Sn could affect element＇s diffusing, thus restrain the coarsening of η′ phase and delay the hardness peak, and the ahoy containing Sn had higher hardness.

关 键 词：锡 析出相 时效行为 铝锌镁铜合金 

分 类 号：TG146.2[一般工业技术—材料科学与工程]