李鹏飞,范景莲,韩勇,章曼,田家敏.W-ZrC材料的强韧化机理和界面结合的研究[J].稀有金属材料与工程,2019,48(3):751~757.[Peng-fei Li,Jing-lian Fan,Yong Han,Man Zhang,Jia-min Tian.Toughening Mechanisms and Interfacial Bonding of W-ZrC Composites[J].Rare Metal Materials and Engineering,2019,48(3):751~757.]
W-ZrC材料的强韧化机理和界面结合的研究
投稿时间:2018-03-16  修订日期:2018-04-10
中文关键词:    ZrC粒子  强韧化机理  球化现象  界面结合
基金项目:
中文摘要:
      W-ZrC材料是核聚变面向等离子体部件用很具发展潜力的材料之一。本文采用“溶胶-非均相沉淀-喷雾干燥-热还原-常压氢气烧结”方法制备了W-ZrC材料,研究了ZrC添加对材料的强韧化作用机理以及W与ZrC的界面结合情况。结果表面:ZrC粒子能够提高钨的强度和韧性,其中W-0.5wt.%ZrC在1920℃烧结时其相对密度和拉伸强度分别达到了99.2%和460MPa。瞬态高热负荷冲击显示W-ZrC材料在承受200 MW/m2(5 ms)的高热流冲击时材料表面没有裂纹,ZrC粒子能够消耗裂纹扩展中的能量并且阻碍裂纹扩展。通过W和ZrC的界面结合研究发现,ZrC在烧结过程中存在长大和球化的过程,并且在1600℃烧结1h时转变为近球形粒子。ZrC和W界面结合区域中的W、Zr、C含量呈现光滑过渡,并且显微硬度显示W、ZrC和界面结合区域的硬度分别为12Gpa、22GPa和18Gpa。线扫描和纳米压痕结果表明在W和ZrC粒子界面处形成了(W,Zr)C固溶相。
Toughening Mechanisms and Interfacial Bonding of W-ZrC Composites
英文关键词:Tungsten  ZrC particles  toughening mechanisms  rounding phenomenon  interfacial bonding
英文摘要:
      W-ZrC composites are promising materials for plasma face components. In this article, a process of “sol gel – heterogeneous precipitation –spray drying – hydrogen reduction – ordinary consolidation sintering” was used to prepare W-ZrC composites. The toughening mechanisms and interfacial bonding of W-ZrC composites were studied. ZrC particles could improve the strength and toughness of tungsten. The relative density and tensile strength of W-0.5wt.%ZrC are 99.2 % and 460 MPa sintering at 1920 °C. Preliminary transient high-heat flux test shows that W-ZrC composites can endure high-heat flux of 200 MW/m2(5 ms), and ZrC particles can consume the crack propagation energy and hinder crack propagation. ZrC particles had a process of growing up and rounding, and translated into nearly spherical particles sintering at 1600 °C held for 1 h. At the interfacial bonding zone of ZrC particles and tungsten, W, Zr, and C elements were smooth transition. The hardness of W,ZrC and interfacial bonging zone were 12 GPa, 22 GPa, and 18 GPa, respectively. The linear SEM-EDS and nanoindentation results indicate that the W and ZrC particles form (W,Zr)C compound.
作者单位E-mail
李鹏飞 中南大学 粉末冶金国家重点实验室 lipf166@163.com 
范景莲 中南大学 粉末冶金国家重点实验室  
韩勇 中南大学 粉末冶金国家重点实验室  
章曼 中南大学 粉末冶金国家重点实验室  
田家敏 中南大学 粉末冶金国家重点实验室  
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