强力错距旋压Al-Zn-Mg-Cu(7075)合金管材的显微组织与力学性能  

Microstructure and mechanical properties of Al−Zn−Mg−Cu(7075)alloy tubes prepared via power stagger spinning

作　　者：郑凡林 陈洪胜 王文先[3] 高会良 高永康 Fan-lin ZHENG;Hong-sheng CHEN;Wen-xian WANG;Hui-liang GAO;Yong-kang GAO(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Intelligent Underwater Equipment,Taiyuan 030024,China;College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,太原030024 [2]山西省智能水下装备重点实验室,太原030024 [3]太原理工大学材料科学与工程学院,太原030024

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第8期2287-2302,共16页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51805358,51775366);Key Research and Development Program of Jinzhong,China(No.Y201023);College Students’Innovative Entrepreneurial Training Plan Program,China(No.202010112011);Shanxi Province Key Research and Development Project,China(No.202102150401003)。

摘　　要：采用强力错距旋压技术在400℃(HS)和室温(RTS)条件下制备7075铝合金管材,并对其成形过程中的显微组织演变和力学性能变化进行研究。结果表明:经过旋压变形后,7075铝合金管材的晶粒明显细化,并且在400℃下厚度减薄60%和70%(HS-60%和HS-70%)的管材组织以变形组织为主,而厚度减薄85%(HS-85%)的管材组织以再结晶组织为主。此外,HS-85%管材由于动态再结晶和异常晶粒长大的出现,形成了具有弱立方织构的双峰晶粒组织。随着400℃下厚度减薄率从0%增加到85%,管材的屈服强度(YS)和极限抗拉强度(UTS)先增加后降低,而伸长率则先降低后增加。室温厚度减薄85%(RTS-85%)的管材的UTS和YS分别为613.5和567.9 MPa,与HS-85%管材相比,分别提高了33.7%和57.4%,但其伸长率仅为7.3%。The tubes of 7075 aluminum alloy were fabricated by power stagger spinning at 400°C(HS)and room temperature(RTS),and then the microstructure evolution and mechanical properties were investigated.Results show that the grains after spinning are refined prominently,and the tubes after 60%and 70%thickness reduction(HS-60%and HS-70%)are dominated by the deformed structure,while the recrystallized structure is dominant in the tube after 85%thickness reduction at 400°C(HS-85%).Furthermore,a bimodal grain structure with a weak Cube texture is obtained in the HS-85%sample due to the emergence of the dynamic recrystallization(DRX)and abnormal grain growth.As the thickness reduction increases from 0%to 85%during spinning at 400°C,the yield strength(YS)and ultimate tensile strength(UTS)increase first and then decrease,while the elongation decreases first and then increases.Compared with that of the HS-85%sample,the UTS and YS of RTS-85%sample are 613.5 and 567.9 MPa,respectively,which are improved by 33.7%and 57.4%,while the elongation is only 7.3%.

关 键 词：7075铝合金 强力错距旋压 显微组织演变 双峰晶粒结构 异常晶粒长大 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]