Effect of non-isothermal aging on microstructure and properties of Al−5.87Zn−2.07Mg−2.42Cu alloys  

非等温时效对Al−5.87Zn−2.07Mg−2.42Cu合金组织和性能的影响

作　　者：Yao LI Guo-fu XU Xiao-yan PENG Shi-chao LIU Ying DENG Xiao-peng LIANG 李耀;徐国富;彭小燕;刘时超;邓英;梁霄鹏(中南大学材料科学与工程学院,长沙410083;中南大学有色金属材料科学与工程教育部重点实验室,长沙410083)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China [2]Key Laboratory of Nonferrous Metal Materials Science and Engineering of Ministry of Education,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2021年第10期2899-2908,共10页中国有色金属学报（英文版）

基　　金：the National Key Research and Development Program of China(No.2018YFB2001801);the Postdoctoral Science Foundation of Central South University,China(No.220363);the National Natural Science Foundation of China(No.51601229).

摘　　要：The evolution of microstructure and properties of Al−5.87Zn−2.07Mg−2.42Cu alloys during non-isothermal aging was studied.The mechanical properties of the alloy were tested by stretching at room temperature.The results show that in the non-isothermal aging process,when the alloy is cooled to 140℃,the ultimate tensile strength of the alloy reaches a maximum value of 582 MPa and the elongation is 11.9%.The microstructure was tested through a transmission electron microscope,and the experimental results show that the GP zones andη'phases are the main strengthening precipitates.At the cooling stage,when the temperature dropped to 180℃,the GP zones were precipitated again.Besides,the experimental results show that the main strengthening phase during non-isothermal aging isη'phases.研究Al−5.87Zn−2.07Mg−2.42Cu合金在非等温时效过程中组织和性能的变化,通过室温拉伸机测试合金的力学性能。结果表明,在非等温时效过程中,当合金冷却到140℃时,合金的抗拉强度达到最大值(582 MPa),此时伸长率为11.9%。此外,通过透射电子显微镜对合金的显微组织进行观察,观察结果表明GP区和η'相是合金的主要强化析出相,当合金冷却到180℃时,GP区发生二次析出。此外,经过非等温时效处理的合金的主要强化相仍为η'相。

关 键 词：Al−Zn−Mg−Cu aluminum alloy non-isothermal aging η'phases mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]