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吴东江,元世军,余超,何爱迪,马广义,牛方勇,卢凡.直接激光沉积Ti6Al4V/Inconel 718复合材料微观组织与力学性能分析[J].稀有金属材料与工程(英文),2021,50(1):78~84.[Dalian University of Technology,Yuan shijun,Yu Chao,He aidi,Ma Guangyi,Niu Fangyong and Lu Fan.Microstructure Evaluation and Mechanical Properties of Ti6Al4V/Inconel 718 Composites Prepared by Direct Laser Deposition[J].Rare Metal Materials and Engineering,2021,50(1):78~84.]
Microstructure Evaluation and Mechanical Properties of Ti6Al4V/Inconel 718 Composites Prepared by Direct Laser Deposition
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Received:December 05, 2019  
DOI:
Key words: Direct laser deposition  Ti6Al4V/Inconel 718 composites  Microstructure  Microhardness  Friction and Wear
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),中国博士后科学基金
Author NameAffiliation
Dalian University of Technology,Yuan shijun,Yu Chao,He aidi,Ma Guangyi,Niu Fangyong and Lu Fan  
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Abstract:
      Ti6Al4V and Inconel 718 alloys are both extensively used in the aerospace industry. However, TC4 or Inconel 718 is difficult to meet the demand of both light weight and high temperature resistance. In this paper, the composites of different Ti6Al4V/Inconel 718 ratios were prepared by direct laser deposition. The phase, microstructure and element distribution were analyzed by X-ray Diffraction, scanning electron microscope and energy dispersive spectrometer, respectively. The microhardness, friction and wear properties were also investigated. With Inconel 718 increasing, Ti2Ni and Ni3Ti intermetallic compound were formed. The forming mechanism of Ti2Ni is: β→α+Ti2Ni and L→β-Ti+Ti2Ni, and the segregation mechanism of Ti2Ni intermetallic compound was intergranular segregation. As the doping of Inconel 718 increased, the microhardness of the composites increased gradually. When the volume fraction of Inconel 718 was 50%, the average microhardness value was 770 HV, which was 85.5% higher than that of 100% Ti6Al4V. The reason for the increase of microhardness was directly related to Ti2Ni intermetallic compound precipitation strengthening. Wear experiments showed that the composites were dominated by abrasive wear and accompanied by adhesive wear. As Inconel 718 increased, the adhesion was weakened, and when Inconel 718 reached 50% volume fraction, the wear volume was just 36.9% of that of 100% Ti6Al4V.