| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Rare Earth Elements on the Microstructure and Properties of Titanium Alloy Laser-welded Joints |
| CHENG Donghai, ZHANG Futing, TAO Xuanyu, YU Chao, GONG Hao, LI Haitao*, WANG De, XIONG Zhenyu
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| School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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Abstract Rare earth element Yb was incorporated in the form of Yb2O3 into the laser weld of TC4 titanium alloy to explore the influences of rare earth elements on the microstructure, room-temperature properties, and high-temperature properties of the laser-welded joints of TC4 titanium alloy. The research indicates that there are white Yb2O3 particles dispersedly distributed within the original β grains of the weld, which can effectively narrow the width of the weld center and refine the β-grain size. When the content of Yb2O3 is 6%, the width of the weld center reduces by 22. 3%, and the β-grain size shrinks by 32. 4%. Yb2O3 can enhance the plasticity of the laser-welded joints of titanium alloy. With the increase in the Yb2O3 content, both the room-temperature elongation and the high-temperature elongation of the weld initially increase and then decrease. When the Yb2O3 content is 6%, the room-temperature elongation reaches a maximum of 6. 8%, and the high-temperature elongation attains a maximum of 382%.
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Published: 10 February 2025
Online: 2025-02-05
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2025, Vol. 39 
