Effects of single and multi-stage solid solution treatments on microstructure and properties of as-extruded AA7055 helical profile

作     者：Cun-sheng ZHANG Zhao-gang ZHANG Ming-fu LIU En-cheng BAO Liang CHEN Guo-qun ZHAO 张存生;张兆刚;刘明甫;鲍恩成;陈良;赵国群

作者机构：Key Laboratory for Liquid−Solid Structural Evolution&Processing of Materials(Ministry of Education)Shandong UniversityJi’nan 250061China 

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

年 卷 期：2021年第31卷第7期

页      面：1885-1901页

核心收录：

学科分类：080503[工学-材料加工工程] 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）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：the financial supports from the National Natural Science Foundation of China(No.51975330) Science Fund for Distinguished Young Scholars of Shandong Province,China(No.JQ201810) the Key Research and Development Program of Shandong Province,China(No.2019JZZY010360) 

主　　题：7055 aluminum alloy extruded profile solid solution treatment mechanical properties corrosion resistance 

摘      要：The effects of single-stage solution treatment(SST),enhanced solution treatment(EST),high-temperature pre-precipitation(HTPP)and multi-stage solution treatment(MST)on the microstructure,mechanical properties and corrosion resistance of the as-extruded 7055 aluminium alloy(AA7055)helical profile were investigated using differential scanning calorimetry(DSC),optical microscopy(OM),scanning electron microscopy(SEM),electron back-scattered diffraction(EBSD)and transmission electron microscopy(TEM).It was observed that EST and MST could promote the dissolution of the second-phase particles compared with the traditional SST,and the intergranular phases were distinctly discontinuously distributed after HTPP and *** was obvious difference in the main texture type and texture strength for the alloy after different solid solution *** could improve the corrosion resistance of the alloy by regulating the intergranular phases,but the mechanical properties were severely *** the good corrosion resistance of the alloy could be obtained by MST without obvious strength *** a result,the MST is an ideal solid solution treatment scheme for AA7055.