时效对新型Al-Zn-Mg-Cu合金力学及应力腐蚀性能的影响  

Influence of Aging Tempers on Mechanical and Stress Corrosion Properties of Novel Al-Zn-Mg-Cu Alloy

作　　者：李锡武[1] 熊柏青[1] 张永安[1] 李志辉[1] 朱宝宏[1] 刘红伟[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《稀有金属》2010年第4期503-508,共6页Chinese Journal of Rare Metals

基　　金：国家高技术研究发展计划资助项目(2008AA03Z506);国家自然科学基金资助项目(50904010)

摘　　要：通过力学性能和电导率测试、慢应变速率试验(SSRT)以及显微组织TEM分析,研究了不同时效制度对新型Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr合金力学及应力腐蚀性能的影响。结果表明,合金的力学性能和应力腐蚀性能与时效制度密切相关。T6状态下,晶内析出相弥散细小,晶界析出相呈连续分布,合金的强度最高,抗应力腐蚀性能最差;经T7双级过时效处理后,晶界析出相粗化呈离散分布,出现明显宽化的晶间无析出带,合金的抗应力腐蚀性能得到明显提高,但其强度损失较多。经三级时效处理后,合金的组织综合了T6态和T7态的优点,使合金既有高的强度又有良好的抗应力腐蚀性能,合金的极限抗拉强度、屈服强度、伸长率和电导率分别达到580,570 MPa,16.7%和23.3 MS.m-1。The influence of different aging tempers on mechanical and stress corrosion properties of a novel Al-7.5Zn-1.7Mg-1.4Cu-0.12Zr alloy was studied by the measurement of mechanical properties and electrical conductivity,slow strain rate testing(SSRT),and the TEM analysis of microstructure.The results showed that the mechanical properties and stress corrosion properties of the alloy were greatly associated with the aging tempers.After T6 temper treatment,the alloy could get a very fine distribution of precipitat...

关 键 词：AL-ZN-MG-CU合金 时效 力学性能 应力腐蚀 显微组织 

分 类 号：TG156.92[金属学及工艺—热处理]