Microstructure of as-extruded 7136 aluminum alloy and its evolution during solution treatment

作     者：Yun-Qiang Fan Kai Wen Zhi-Hui Li Xi-Wu Li Yong-An Zhang Bai-Qing Xiong Jian-Xin Xie 

作者机构：State Key Laboratory of Nonferrous Metals and ProcessesGeneral Research Institute for Nonferrous Metals State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology Beijing 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2017年第36卷第4期

页      面：256-262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：supported by the National Key Research and Development Program of China (No. 2016YFB0300903) the National Program on Key Basic Research Project of China (No. 2012CB619504) the National Natural Science Foundation of China (No. 51274046) 

主　　题：7136 Aluminum alloy Microstructure Solution treatment Tensile property 

摘      要：With the aid of scanning electron microscopy （SEM）, energy-dispersive spectroscopy （EDS）, X-ray diffraction （XRD）, differential scanning calorimetry （DSC） analysis and electron backscatter diffraction （EBSD）, the microstructure of the alloy in as-extruded state and various solution-treated states was investigated. The results indi- cate that second phase of the as-extruded 7136 aluminum alloy mainly consists of Mg（Zn, Cu, Al）2 and Fe-rich phases. The Mg（Zn, Cu, Al）2 phase directly dissolves into the matrix during solution treatment with various solution temperatures. After solution treated at 475℃ for 1 h, Mg（Zn, Cu, Al）2 phases are dissolved into the matrix, while Fe-rich phases still exist. Fe-rich phases could not dissolve into the matrix by prolonging solution time. The mechanical property test and EBSD observation show that two-stage solution treatment makes no significant improvement in mechanical properties and recrystallization of the alloy. The optimized solution treatment parameter is chosen as 475 ℃/1 h.