首页|Relationship between solidification path,microstructure evolution and solidification cracking behavior of Mg-Al-Ca alloy during TIG welding

Relationship between solidification path,microstructure evolution and solidification cracking behavior of Mg-Al-Ca alloy during TIG welding

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The high-strength and creep-resistant Mg-Al-Ca-Mn alloys have broad application prospects.However,solidification cracking occurs in these alloys in certain conditions and the origin is still unclear.This work investigated the relationship between the solidification path,microstructure evolution and solidification cracking behavior of the Mg-xAl-2Ca-Mn alloys during tungsten inert gas(TIG)welding.Results show that when the fusion zone's Ca/Al mass ratio ranges from 0.4 to 1.64,solidification cracking occurs at a Ca/Al mass ratio of～0.7.As the Ca/Al mass ratio approaches this value,the grain size increases,and the Laves phases are reduced gradually.The early formed Laves phases play an important role in promoting dendrite segmentation,refining grain size and enhancing grain boundaries.When a solidification path delays the formation of Laves phases,the Laves phases will be reduced accompanied by grain coarsening.In such a solidifying microstructure,intergranular cavitation is easy to occur,and the resistance of the semi-solid alloy to crack propagation is severely reduced.

Magnesium alloyWeldingSolidification crackingSolidification pathLaves phase

Sensen Chai、Qingwei Dai、Shiyu Zhong、Qingshan Yang、Limeng Yin、Dingfei Zhang、Jingkai Feng、Qian Li

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School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China

College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China

Department of Mechanical Engineering,City University of Hong Kong,Hong Kong 999077,SAR,China

XI'AN Rare Metal Materials Institute Co.,Ltd.,Xi'an 710016,China

State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China

National Engineering Research Center for Magnesium Alloy,Chongqing University,Chongqing 400044,China

National Key Laboratory of Advanced Casting Technologies,Chongqing University,Chongqing 400044,China

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国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金重庆市自然科学基金重庆市自然科学基金Scientific and Technological Research Program of Chongqing Municipal Education CommissionInnovative research team of universities in Chongqing

U2102212523011345227109252371095CSTB2022NSCQ-MSX1438CSTB2022NSCQ-MSX0891KJQN202001527CXQT21030

2024

10.1016/j.jmst.2023.10.016

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)：2024.182(15)
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