重固溶再双级时效处理对7175铝合金力学性能和微观组织的影响  

Effects of resolution and reaging treatment on mechanical properties and microstructure of 7175 aluminum alloy

作　　者：尚勇[1] 张立武[1] 

机构地区：[1]中国航天科技集团公司四院七四一四厂,西安710025

出　　处：《固体火箭技术》2006年第3期225-228,共4页Journal of Solid Rocket Technology

摘　　要：采用SEM、TEM、拉伸试验、电导率测试及观察等方法,研究了重固溶再双时效制度对7175铝合金性能的影响。结果表明,在对7175铝合金的重固溶再双时效处理中,第二级时效温度是重要的影响因素。经过480℃×2 h+95℃×8 h+180℃×10 h固溶时效后,得到了较佳的综合性能。同时,当7175铝合金晶内析出相为更多更细小的GP区和小尺寸的η′相,晶界析出相尺寸较大时,材料将对应着良好综合性能。THe effects of resolution and reaging treatment on mechanical properties of 7175 aluminum alloy were investigated by using scanning electron microscopy （ SEM ）, transmission electron microscopy （ TEM ）, tensile test and conductivity measurement test. The results show that the second-stage ageing temperature is the most important effect factor,and the optimum comprehensive properties can be obtained by means 480℃×2h＋95℃×8h＋180℃×10h resolution and reaging treatment. At the same time ,when intracrystalline precipitated phase of 7175 aluminum alloy includes more and finer GP zone and small-size η＇ phase, and size of precipitated phase in grain boundary becomes bigger, the material would possess good comprehensive properties.

关 键 词：铝合金 力学性能 重固溶 双级时效 

分 类 号：TG166.3[金属学及工艺—热处理]