Effect of three-step homogenization on microstructure and properties of 7N01 aluminum alloys

作     者：Hua-qiang LIN Ling-ying YE Lin SUN Tao XIAO Sheng-dan LIU Yun-lai DENG Xin-ming ZHANG 林化强;叶凌英;孙琳;肖涛;刘胜胆;邓运来;张新明

作者机构：National Engineering Research Center for High-Speed EMU CRRC Qingdao Sifang Co. Ltd. Qingdao 266000 China School of Materials Science and Engineering Central South University Changsha 410083 China Light Alloy Research Institute Central South University Changsha 410083 China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2018年第28卷第5期

页      面：829-838页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Projects(2016YFB0300901,2016YFB0300902)supported by the National Key Research and Development Program of China Project(51375503)supported by the National Natural Science Foundation of China Project(2013A017)supported by Guangxi Zhuangzu Autonomous Region of China 

主　　题：7N01 aluminum alloy three-step homogenization microstzucture mechanical properties stress corrosion cracking 

摘      要：The effect of different homogenization treatments on the microstructure and properties of the 7N01 aluminum alloy was investigated using hardness measurements, electrical conductivity measurements, tensile and slow strain rate tests, electron probe microanalysis, optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results revealed that three-step homogenization improved the uniformity of Zr distribution by eliminating segregation of the main alloying elements. During the second homogenization step at 350 °C for 10 h, coarse and strip-like equilibrium η phases formed which assisted the nucleation of Al3Zr dispersoids and reduced the width of the precipitate-free zone of A13Zr dispersoids. As a result, coarse recrystallization was greatly reduced after homogenization at 200 °C, 2 h ＋ 350 °C, 10 h ＋ 470 °C, 12 h, which contributed to improving the overall properties of the 7N01 aluminum alloys.