Microstructure and tensile properties of laser melting deposited TiC/TA15 titanium matrix composites
Microstructure and tensile properties of laser melting deposited TiC/TA15 titanium matrix composites
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DOI：
10.1016/j.jallcom.2009.05.112
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发表时间：
2009-10-19
影响因子：
6.2
通讯作者：
Wang, H. M.
中科院分区：
文献类型：
--
作者：
Liu, D.;Zhang, S. Q.;Wang, H. M.
采用激光熔融沉积（LIVID）工艺制备TiC/TA15钛基复合材料。复合材料的微观结构和室温拉伸性能作为 TiC 体积分数的函数进行评估。沉积复合材料中的大部分 TiC 增强材料为等轴或近等轴颗粒。随着TiC体积分数从5%增加到15%，TiC颗粒的平均尺寸为8.6-11.2μm。拉伸测试表明，含有 5 vol.% TiC 的复合材料与整体基体相比表现出更好的强度，而复合材料的拉伸性能随着 TiC 体积分数的进一步增加而恶化。复合材料的损伤机制主要是颗粒破裂，然后是基体的延性破坏。 TiC体积分数高于5%的复合材料拉伸强度下降的主要原因是块状粗大和团聚的TiC增强体在拉伸过程中过早失效，以及复合材料延展性下降。 (C) 2009 Elsevier B.V. 保留所有权利。
TiC/TA15 titanium matrix composites were fabricated by laser melting deposition (LIVID) process. Microstructures and room temperature tensile properties of the composites were evaluated as a function of TiC volume fraction. Majority of the TiC reinforcement was in equiaxed or near-equiaxed particles in the as-deposited composites. Average size of the TiC particulates are 8.6-11.2 mu m as the TiC volume fraction increases from 5% to 15%. Tensile tests indicated that the composite containing 5 vol.%TiC showed better strength compared to monolithic matrix, while tensile properties of the composites deteriorated with further increasing TiC volume fractions. The damage mechanism of the composites is dominated by particle cracking followed by ductile failure of the matrix. The decrease of tensile strength of composites with TiC volume fractions higher than 5% was mainly attributed to the premature failure of the blocky coarse and agglomerated TiC reinforcements during tension, and the degradation in ductility of the composites. (C) 2009 Elsevier B.V. All rights reserved.