Damage behavior of REE-doped W-based material exposed to high-flux transient heat loads

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• 作者：Jing Shi^a ; Lai&ndash ; Ma Luo^a ; ^c ; ^{luolaima@126.com} ; Jin&ndash ; shan Lin^a ; Xiang Zan^a ; ^c ; Xiao&ndash ; yong Zhu^a ; ^c ; Qiu Xu^b ; Yu&ndash ; Cheng Wu^a ; ^c ; ^{ycwu@hfut.edu.cn}
• 关键词：REE-doped W-based material ; Transient heat loads ; Laser beam ; Mechanism
• 刊名：Fusion Engineering and Design
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：113
• 期：Complete
• 页码：92-101
• 全文大小：6274 K
• 卷排序：113

文摘

Pure W and W-Lu alloys were prepared by mechanical alloying (MA) and spark plasma sintering (SPS) technology. The performance and relevant damage mechanism of W-(0%, 2%, 5%, 10%) Lu alloys under transient heat loads were investigated using a laser beam heat load test to simulate the transient events in future nuclear fusion reactors. Scanning electron microscopy was used to observe the morphologies of the damaged surfaces and energy dispersive X-ray spectroscopy was used to conduct composition analysis. Damages to the surface such as cracks, pits, melting layers, Lu-rich droplets, and thermal ablation were observed. A mass of dense fuzz-like nanoparticles formed on the outer region of the laser-exposed area. Recrystallization, grain growth, increased surface roughness, and material erosion were also observed. W-Lu samples with low Lu content demonstrated better thermal performance than pure W, and the degree of damage significantly deteriorated under repetitive transient heat loads.