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

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

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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 out.It is found that the majority of the MgZnCu phase in the fusion zone(FZ)is dissolved in the α-Mg matrix under suitable heat treatment conditions.The remainder is diffusely distributed as rods or granules at the grain bound-aries.The excessive heat treatment temperature(460 ℃)leads to abnormal grain growth(AGG)in the FZ.The substructure gradient between the abnormally grown grains and the surrounding small grains pro-vides the driving force for AGG.Meanwhile,the dissolution of the MgZnCu phase weakens the hindering effect of the second phase on grain boundary migration,setting the stage for AGG.In addition,the detri-mental impact of the continuous MgZnCu phase on the mechanical properties of the welded joint is also lessened by its dissolution.The 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 h.The welding coefficient of the welded joint reaches 97.0％,satisfying the service criteria set forth by the mechanical properties of the welded joints.

GTAWFZHeat treatmentAGGMechanical properties

Weiyang Zhou、Qichi Le、Ye Shi、Qiyu Liao、Tong Wang、Qi Zou、Clodualdo Aranas Jr

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Key Lab of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China

Key Laboratory of Lightweight Structural Materials,Liaoning Province,Northeastern University,Shenyang 110819,China

School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China

Department of Mechanical Engineering,University of New Brunswick,Fredericton,E3B 5A3,New Brunswick,Canada

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国家自然科学基金中央高校基本科研业务费专项高等学校学科创新引智计划(111计划2.0)

51974082N2209001BP0719037

2024

10.1016/j.jmst.2023.06.019

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.169(2)
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