Combined effects of ECAP and subsequent heating parameters on semi-solid microstructure of 7075 aluminum alloy

作     者：Ramin MESHKABADI Ghader FARAJI Akbar JAVDANI Vahid POUYAFAR Ramin MESHKABADI;Ghader FARAJI;Akbar JAVDANI;Vahid POUYAFAR

作者机构：School of Mechanical EngineeringCollege of EngineeringUniversity of TehranTehran 11155-4563Iran Department of Mechanical EngineeringUniversity of TabrizTabriz ***Iran 

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

年 卷 期：2016年第26卷第12期

页      面：3091-3101页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0806[工学-冶金工程] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0703[理学-化学] 0802[工学-机械工程] 0814[工学-土木工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

主　　题：7075 aluminum alloy equal channel angular pressing semi-solid microstructure grain size shape factor 

摘      要：The combined effects of equal channel angular pressing (ECAP) and subsequent heating to a semi-solid temperature on the microstructural characteristics of the 7075 aluminum alloy were investigated. The microstructure is influenced by several parameters including the number of ECAP passes, ECAP route, consequent heating temperature, and holding time. The effects of these parameters on the microstructural characteristics including grain size and shape factor of the 7075 aluminum alloy were studied using experimental tests and Taguchi method. The results indicate that five-pass ECAP in route BA and subsequent isothermal holding at 630 °C for 15 min are more appropriate for achieving a semi-solid microstructure. The processing route and holding time have the highest impact on the grain size while the number of ECAP passes and heating temperature have the least impact on the grain size. Meanwhile, the shape factor is significantly influenced by the processing route, holding time and heating temperature while it is less influenced by the number of ECAP passes.