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李雪峤,金头男,杜社军,常雷,林英华,雷永平.激光原位制备TiB/Ti-6Al-4V复合涂层中TiB管状结构的形成机制[J].稀有金属材料与工程(英文),2018,47(3):915~919.[Li Xueqiao,Jin Tounan,Du Shejun,Chang Lei,Lin Yinghua,Lei Yongping.Formation mechanism of the tubular TiB in situ formed in TiB/Ti-6Al-4V composite coating by laser cladding.[J].Rare Metal Materials and Engineering,2018,47(3):915~919.]
Formation mechanism of the tubular TiB in situ formed in TiB/Ti-6Al-4V composite coating by laser cladding.
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Received:January 13, 2016  Revised:March 15, 2016
DOI:
Key words: laser cladding  Formation mechanism  EBSD  TEM
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Author NameAffiliationE-mail
Li Xueqiao 北京工业大学 材料科学与工程学院 281388511@qq.com 
Jin Tounan 北京工业大学 材料科学与工程学院 tnjinkim@bjut.edu.cn 
Du Shejun 西部超导材料科技股份有限公司  
Chang Lei 北京工业大学 材料科学与工程学院  
Lin Yinghua 北京工业大学 材料科学与工程学院  
Lei Yongping 北京工业大学 材料科学与工程学院  
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Abstract:
      The morphology, distribution and crystallographic orientation of TiB in situ formed in TiB/Ti-6Al-4V composite coating by laser was observed and analyzed by TEM, EBSD systematically, in order to explore the formation mechanism of tubular TiB. The results show that, TiB showed two morphologies: rod and needle. And the morphology of TiB crystals is controlled by growth time and element concentration. Rod-like TiB nucleated in the hypereutectic region, and needle-like TiB nucleated in the eutectic and hypoeutectic region. The growth of (010)B27 and (001)BF planes will no longer be stable, when the the product of diameter and the growth rate of TiB exceed the critical value. The growth rate in the edge region of TiB is faster than the center due to the concentration of B. TiB eventually forms a tubular structure because B element is consumed by the growth of edges that further inhibits the growth of the central region.With the increase of diameter of TiB, the tubular structure appears more frequently.