Room-temperature tensile strength and thermal shock behavior of spark plasma sintered W-K-TiC alloys

Room-temperature tensile strength and thermal shock behavior of spark plasma sintered W-K-TiC alloys
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放电等离子烧结W-K-TiC合金的室温拉伸强度和热震行为

DOI:
10.1016/j.net.2018.09.015
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发表时间:
2019-02
影响因子:
2.7
通讯作者:
Jun Tang
Jun Tang
中科院分区:
工程技术3区
文献类型:
--
作者:
Ke Shi;Bo Huang;Bo He;Ye Xiao;Xiaoliang Yang;Youyun Lian;Xiang Liu;Jun Tang

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具有不同碳化钛浓度(0.05,0.1,0.25,0.5,1,2)wt.%的W-K-TiC合金通过机械合金化和放电等离子烧结制备。研究了纳米TiC颗粒的加入对复合材料的致密度、显微硬度、显微组织、晶体信息、抗热震性和拉伸强度的影响。结果表明,掺杂TiC纳米颗粒主要分布在晶界处。TiC的加入提高了W-K-TiC合金的致密度和显微硬度,其最高显微硬度为731.55。随着TiC添加量从0.05wt%增加到2wt%,室温抗拉强度从141提高到353 MPa。随着TiC掺杂量的增加,W-K-TiC合金的晶粒尺寸从2.56 μm急剧减小到330 nm。随着TiC添加量的增加,W-K-TiC合金的抗热震性能略有提高。
W-K-TiC alloys with different titanium carbide concentrations (0.05, 0.1, 0.25, 0.5, 1, 2) wt.% were fabricated through Mechanical Alloying and Spark Plasma Sintering. The effects of the addition of nano-scaled TiC particles on the relative density, Vickers micro-hardness, microstructure, crystal information, thermal shock resistance, and tensile strength were investigated. It is revealed that the doped TiC nano-particles located at the grain boundaries. The relative density and Vickers micro-hardness of W-K-TiC alloys was enhanced with TiC addition and the highest Vickers micro-hardness is 731.55. As the TiC addition increased from 0.05 to 2 wt%, the room-temperature tensile strength raised from 141 to 353 MPa. The grain size of the W-K-TiC alloys decreased sharply from 2.56 μm to 330 nm with the enhanced TiC doping. The resistance to thermal shock damage of W-K-TiC alloys was improved slightly with the increased TiC addition.
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