Influence of dynamic recrystallization on microstructure and mechanical properties of welding zone in Al-Mg-Si aluminum profile during porthole die extrusion

作     者：Shi-kang LI Luo-xing LI Hong HE Zhi-wen LIU Long ZHANG 李世康;李落星;何洪;刘志文;张龙

作者机构：State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082China College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China 

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

年 卷 期：2019年第29卷第9期

页      面：1803-1815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：Project(U1664252)supported by the National Natural Science Foundation of China 

主　　题：6063 aluminum alloy porthole die extrusion dynamic recrystallization microstructure mechanical properties 

摘      要：The effect of dynamic recrystallization(DRX)on the microstructure and mechanical properties of 6063 aluminum alloy profile during porthole die extrusion was studied through experiment and *** grain morphology was observed by means of electron backscatter diffraction(EBSD)*** results show that,at low ram speeds,increasing the ram speed caused an increase in DRX fraction due to the increase of temperature and strain *** contrast,at high ram speeds,further increasing ram speed had much less effect on the temperature,and the DRX faction decreased due to high stain *** microhardness and fraction of low angle boundaries in the welding zones were lower than those in the matrix *** grain size in the welding zone was smaller than that in the matrix zone due to lower DRX *** decrease of grain size and increase of extrudate temperature were beneficial to the improvement of microhardness.