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陈曦,张钊,谢发勤,马铁军,李文亚,吴向清.在线去应力退火对线性摩擦焊TiAl合金接头微结构与力学性能的影响机制[J].稀有金属材料与工程(英文),2021,50(8):2765~2770.[Chen Xi,Zhang Zhao,Xie Faqin,Ma Tiejun,Li Wenya and Wu Xiangqing.Microstructure Evolution and Mechanical Properties of Linear Friction Welded TiAl Alloy Joint with Online Stress Relieving[J].Rare Metal Materials and Engineering,2021,50(8):2765~2770.]
Microstructure Evolution and Mechanical Properties of Linear Friction Welded TiAl Alloy Joint with Online Stress Relieving
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Received:June 23, 2020  
DOI:
Key words: linear friction welding  TiAl alloys  online stress relieving  microstructure  mechanical property
Foundation item:国家自然科学基金项目面上项目;陕西省自然科学基础研究计划重点项目
Author NameAffiliation
Chen Xi,Zhang Zhao,Xie Faqin,Ma Tiejun,Li Wenya and Wu Xiangqing  
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Abstract:
      Crack-free TiAl joints were welded by linear friction welding with online stress relieving process. Microstructural examination demonstrates that the joint has a clearly identified weld zone which consists mainly of equiaxed γ grains with a few α2 phase. Lamellar grains in thermo-mechanically affected zones near the weld margin are oriented along with the flow direction of the plasticized material. The microhardness of the joint presents a global increase from the base metal to the weld interface by about 1700 MPa; the tensile strength of the joints ranges from 683 MPa to 717 MPa at ambient temperature, which is comparable to that of the base metal. The refinement strengthening contributes to enhancing the joint strength.