Microstructure and helium irradiation performance of high purity tungsten processed by cold rolling

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• 作者：Zhe Chen^a ; ^c ; Wenjia Han^a ; Jiangang Yu^a ; Laszlo Kecskes^b ; Kaigui Zhu^a ; ^{kgzhu@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Qiuming Wei^c ; ^{qwei@uncc.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Rolling ; Tungsten ; Plasma facing materials ; Irradiation
• 刊名：Journal of Nuclear Materials
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：479
• 期：Complete
• 页码：418-425
• 全文大小：1927 K

文摘

This work aims to investigate the effects of confined cold rolling on the evolution of microstructure, hardness, and helium irradiation performance of high purity tungsten (W). Using a final rolling temperature of 450 °C, W samples were severely deformed by confined cold rolling up to equivalent strains (ε_eq) of 1.6 and 3.3. Experimental results indicate that the average grain size of W specimens processed by confined cold rolling has been greatly reduced, and the rolled W samples with ε_eq ∼3.3 do not show an “ideal texture” of (001)[110] which is the expected texture of bcc metals processed by conventional cold rolling. The irradiation resistance against 60 keV He⁺ ions with up to a dose of 1.5 × 10²² ions·m⁻² of the rolled W is compared to that of the as-received W. Results show that, due to an improvement of the metal's ductility, blister bursting with a partially opened lid forms on the surface of the rolled W, whereas blister bursting with a fully opened lid forms on the surface of the as-received W.