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本文研究了机械合金化+热压(HP)烧结制备的钨钒(W-V)合金在热冲击作用下的表面损伤行为。以合金中钒的质量分数作为变量,探究钒质量分数的变化(1%~10%)对钨钒合金抗热冲击性能的影响。利用光学显微镜、扫描电镜、能谱仪、纳米压痕仪等多种测试方式,分析表征了HP烧结钨钒合金的组织结构特征及其经过热冲击测试后的表面开裂及熔化行为特征。结果表明:在1 800°C、20 MPa的压力条件下保温2 h可以制备出致密度高、合金化程度高的钨钒合金,且随着钒质量分数的增加,合金样品的致密度有所提高;合金样品中钨基体硬度大于富钒相,在高能电子束模拟的国际热核聚变实验堆(ITER)边界局域模(ELMs)热冲击作用下,钨基体对裂纹扩展的阻碍作用明显强于富钒相;随着钒质量分数的升高,合金的开裂阈值和熔化阈值均降低,本文对相关机理进行了讨论。
In this paper, the surface damage behavior of tungsten-vanadium (W-V) alloy prepared by mechanical alloying + hot pressing (HP) sintering under thermal shock was studied. The effect of vanadium mass fraction (1% ~ 10%) on the thermal shock resistance of tungsten-vanadium alloy was investigated using the mass fraction of vanadium in the alloy as a variable. The microstructures of HP-sintered tungsten-vanadium alloy were characterized and characterized by optical microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), nanoindentation and other tests, and their surface cracking and melting behavior after thermal shock test were analyzed. The results show that the tungsten-vanadium alloy with high density and high degree of alloying can be prepared by holding at a temperature of 800 ° C and a pressure of 20 MPa for 2 h. With the increase of the mass fraction of vanadium, the density of the alloy sample . The hardness of the tungsten matrix in the alloy samples is greater than that of the vanadium-rich phase. Under the ITER boundary local mode (ELMs) thermal shock simulated by the high-energy electron beam, the effect of the tungsten matrix on the crack propagation is obviously strong In vanadium rich phase, as the mass fraction of vanadium increases, the cracking threshold and the melting threshold of the alloy decrease, the relevant mechanism is discussed in this paper.