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陈 硕,赵忠民,张 龙,程兆刚,于贵波.中间钛片对TiB2基陶瓷/钛合金梯度复合材料组织性能的影响[J].稀有金属材料与工程(英文),2018,47(3):788~793.[Chen Shuo,Zhao Zhongmin,Zhang Long,Cheng Zhaogang and Yu Guibo.Effects of Ti sheet insert on microstructure and properties of graded composites of TiB2-based ceramic and Ti-6Al-4V steel[J].Rare Metal Materials and Engineering,2018,47(3):788~793.]
Effects of Ti sheet insert on microstructure and properties of graded composites of TiB2-based ceramic and Ti-6Al-4V steel
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Received:March 18, 2016  Revised:April 20, 2016
DOI:
Key words: graded composite  self-propagating synthesis  interfacial microstructure  atomic interdiffusion  thermal match
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Chen Shuo,Zhao Zhongmin,Zhang Long,Cheng Zhaogang and Yu Guibo  
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Abstract:
      By inserting Ti sheet between ceramic powder and Ti alloy steel, (TiC-TiB2)/Ti-6Al-4V graded composites were rapidly prepared by SHS centrifugal-casting process under different Ti sheet thickness from 0.5 mm to 1.5 mm. XRD, FESEM and EDS results showed that there was no significant change in phase composition of the ceramic matrix, but promoted the microstructure refinement of the reaction products with the thickness increased. Meanwhile, the introduction of Ti sheet not only enhances the thickness of the gradient interface, but also decreased the thermal infected zone of interface. Moreover, fusion bonding and atomic interdiffusion between liquid TiC-TiB2 and excessive Ti liquid in thermal vacuum circumstances were considered to initiate peritectic reaction of , direct growth of TiB solids from liquid Ti and eutectic reaction of TiB solids and liquid Ti at the final stage of joint solidification, so that consumption of TiB2 solids and increase of TiB crystal improved the interface residual stress, and the joint of the ceramic to Ti alloy was achieved in multilevel and multiscale. The joint in better thermal match and continuously-graded microstructure represents not only a transitional change in Vickers hardness but also the high shear strength of 316±25 MPa between the ceramic and Ti alloy.