Microstructure and mechanical properties of TIG/A-TIG welded AZ61/ZK60 magnesium alloy joints

被引：27
|
作者：
Qin, Bo [1 ,2 ]
Yin, Fu-cheng [1 ]
Zeng, Cheng-zong [3 ]
Xie, Jia-cheng [3 ]
Shen, Jun [3 ]
机构：
[1] Xiangtan Univ, Sch Mat Sci & Engn, Xiangtan 411105, Peoples R China
[2] Hunan Inst Engn, Hunan Prov Key Lab Vehicle Power & Transmiss Syst, Xiangtan 411104, Peoples R China
[3] Chongqing Univ, Coll Mat Sci & Engn, Natl Engn Res Ctr Magnesium Alloys, Chongqing 400044, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2019年 / 29卷 / 09期
基金：
中国国家自然科学基金;
关键词：
AZ61; ZK60; dissimilar joints; tungsten inert gas arc (TIG) welding; activating tungsten inert gas arc (A-TIG) welding; inhomogeneity; VIBRATION; EVOLUTION;
D O I：
10.1016/S1003-6326(19)65094-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The dissimilar joints of AZ61 and ZK60 magnesium alloys were obtained by tungsten inert gas arc (TIG) welding and activating tungsten inert gas arc (A-TIG) welding processes. Microstructure characterization shows that, the fine a-Mg equiaxed dendrite crystals contained Mg17Al12 and MgZn2 particles in the fusion zone. The average size of the alpha-Mg grains in the fusion zone was refined to 19 mu m at welding current of 80 A, which resulted in the largest tensile strength of 207 MPa. The tensile strength and the width of the beam of the A-TIG welded AZ61/ZK60 joints showed strong dependence on the amount of TiO2. However, the inhomogeneity of the heat-affected zone near different base metals presented no significant effect on the mechanical properties of the welded joint.
引用
收藏
页码：1864 / 1872
页数：9
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