Enhancement of mechanical properties of GTAW joints for ZC63 magnesium alloy by post-weld heat treatment

作     者：Weiyang Zhou Qichi Le Ye Shi Qiyu Liao Tong Wang Qi Zou Clodualdo Aranas Jr Weiyang Zhou;Qichi Le;Ye Shi;Qiyu Liao;Tong Wang;Qi Zou;Clodualdo Aranas Jr

作者机构：Key Lab of Electromagnetic Processing of MaterialsMinistry of EducationNortheastern UniversityShenyang 110819China Key Laboratory of Lightweight Structural MaterialsLiaoning ProvinceNortheastern UniversityShenyang 110819China School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Department of Mechanical EngineeringUniversity of New BrunswickFrederictonE3B 5A3New BrunswickCanada 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2024年第169卷第2期

页      面：251-263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 Natural Science Foundation of China(No.51974082) the Fundamental Research Funds for the Central Universities(No.N2209001) the Programme of Introducing Talents of Discipline Innovation to Universities 2.0(the 111 Project 2.0 of China,No.BP0719037) 

主　　题：GTAW FZ Heat treatment AGG Mechanical properties 

摘      要：To further improve the microstructure and mechanical properties of gas tungsten arc welded(GTAW)welded joints for ZC63 magnesium alloy,post-weld heat treatment is carried *** is found that the majority of the MgZnCu phase in the fusion zone(FZ)is dissolved in theα-Mg matrix under suitable heat treatment *** remainder is diffusely distributed as rods or granules at the grain *** excessive heat treatment temperature(460℃)leads to abnormal grain growth(AGG)in the *** substructure gradient between the abnormally grown grains and the surrounding small grains pro-vides the driving force for ***,the dissolution of the MgZnCu phase weakens the hindering effect of the second phase on grain boundary migration,setting the stage for *** addition,the detri-mental impact of the continuous MgZnCu phase on the mechanical properties of the welded joint is also lessened by its *** ultimate tensile strength(UTS),yield strength(YS)and elongation(EL)of the welded joints are 255 MPa,119 MPa and 27.0%,respectively,under the post-weld heat treatment process of 440℃×12 *** welding coefficient of the welded joint reaches 97.0%,satisfying the service criteria set forth by the mechanical properties of the welded joints.