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,2021,50(1):78~84.[Dalian University of Technology,Yuan shijun,Yu Chao,He aidi,Ma Guangyi,Niu Fangyong,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.]
直接激光沉积Ti6Al4V/Inconel 718复合材料微观组织与力学性能分析
投稿时间:2019-12-05  修订日期:2020-02-13
中文关键词:  直接激光沉积  Ti6Al4V/Inconel 718复合材料  微观组织  显微硬度  摩擦磨损
基金项目: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
中文摘要:
      Ti6Al4V和Inconel 718合金被广泛用于航空航天。但TC4或Inconel 718难以同时满足轻量化和耐高温的需求。本文采用直接激光沉积制备了不同比例Ti6Al4V / Inconel 718复合材料。分别通过X射线衍射,扫描电子显微镜和能谱仪分析相组成,微观结构和元素分布。同时,研究了显微硬度和摩擦磨损性能。研究表明:随着Inconel 718的比例增加,有Ti2Ni和Ni3Ti金属间化合物形成。Ti2Ni的形成机理为:β→α+ Ti2Ni和L→β-Ti+ Ti2Ni,且Ti2Ni金属间化合物的偏析机理为晶间偏析。随着Inconel 718含量增加,复合材料的显微硬度逐渐增加。当Inconel 718的体积分数为50%时,其平均显微硬度值为770 HV,比100% Ti6Al4V的平均显微硬度高85.5%。显微硬度增加与Ti2Ni金属间化合物的析出强化直接相关。复合材料以磨料磨损为主,并伴随着黏着磨损。随着Inconel 718的增加,黏着磨损减弱。当Inconel 718的体积分数达到达到50%时,磨损量仅为100% Ti6Al4V的36.9%。
Microstructure Evaluation and Mechanical Properties of Ti6Al4V/Inconel 718 Composites Prepared by Direct Laser Deposition
英文关键词:Direct laser deposition  Ti6Al4V/Inconel 718 composites  Microstructure  Microhardness  Friction and Wear
英文摘要:
      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.
作者单位E-mail
吴东江 School of Mechanical Engineering djwudut@dlut.edu.cn 
元世军 School of Mechanical Engineering  
余超 School of Mechanical Engineering  
何爱迪 School of Mechanical Engineering  
马广义 School of Mechanical Engineering gyma@dlut.edu.cn 
牛方勇 School of Mechanical Engineering  
卢凡 School of Mechanical Engineering  
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