Helium-induced swelling and mechanical property degradation in ultrafine-grained W and W-Cu nanocomposites for fusion applications
Helium-induced swelling and mechanical property degradation in ultrafine-grained W and W-Cu nanocomposites for fusion applications
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DOI：
10.1016/j.scriptamat.2022.114641
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发表时间：
2022-05
影响因子：
6
通讯作者：
M. Wurmshuber;M. Balooch;Xi Huang;P. Hosemann;D. Kiener
中科院分区：
文献类型：
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作者：
M. Wurmshuber;M. Balooch;Xi Huang;P. Hosemann;D. Kiener
除了高剂量辐射和极端热负荷外，部署在新型核聚变反应堆中的材料的一个主要问题是氦气泡的形成和生长。这项工作研究了氦注入超细晶W和纳米晶W-Cu后的膨胀和力学性能退化，这两种材料可能分别作为聚变堆偏滤器和热沉材料的候选材料。结果表明，超细晶W和单晶W在氦注入后具有相似的体积膨胀，但表现出不同的发泡行为。然而，与粗晶复合材料相比，W-Cu纳米复合材料表现出较小的膨胀，这是因为辐射诱导的空位通过界面有效地湮没。此外，氦填充的空腔结构导致了复合材料的相当大的软化。
Besides high dose radiation and extreme thermal loads, a major concern for materials deployed in novel nuclear fusion reactors is the formation and growth of helium bubbles. This work investigates the swelling and mechanical property degradation after helium implantation of ultrafine-grained W and nanocrystalline W-Cu, possible candidates for divertor and heat-sink materials in fusion reactors, respectively. It is found that ultrafine-grained W and single crystalline W experience similar volumetric swelling after helium implantation but show different blistering behavior. The W-Cu nanocomposite, however, shows a reduced swelling compared to a coarse-grained composite due to the effective annihilation of radiation-induced vacancies through interfaces. Furthermore, the helium-filled cavity structures lead to considerable softening of the composite.