Hybrid diffusive-displacive helium outgassing in Cu/Nb multilayer composites
Hybrid diffusive-displacive helium outgassing in Cu/Nb multilayer composites
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Cu/Nb 多层复合材料中的混合扩散-置换氦除气
DOI：
10.1016/j.scriptamat.2020.113706
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发表时间：
2021-01-12
影响因子：
6
通讯作者：
Li, Ju
中科院分区：
文献类型：
--
作者：
Gao, Rui;Jin, Miaomiao;Li, Ju
气体的产生会降低核应用中的材料性能。提出建造自组装气泡通道来帮助将气体释放到表面。在本研究中，通过热解吸光谱、原位 TEM 加热和分子动力学模拟来评估结构损伤较低的氦辐照 Cu/Nb 多层膜中除气的可行性。我们发现排气网络的形成具有混合扩散-位移性质，具有扩散气泡合并和裂纹引起的位移断裂。后者可能会破坏多层结构的完整性。这表明应仔细设计利用自组装空腔网络的除气策略，以避免大规模结构失效。 (c) 2020 年由 Elsevier Ltd 代表 Acta Materialia Inc. 发布。
Gas generation degrades material properties in nuclear applications. The construction of self-assembled bubble channels was proposed to help release gas to the surface. In this study, thermal desorption spectroscopy, in-situ TEM heating and molecular dynamics simulations were carried out to assess the out gassing feasibility in helium-irradiated Cu/Nb multilayers with low structural damage. We found that the formation of outgassing networks has a hybrid diffusive-displacive nature, with diffusive bubble coalescence and crack-induced displacive fracture. The latter could destroy the integrity of the multilayer structure. This suggests that the outgassing strategy making use of self-assembled cavity networks should be carefully designed to avoid large-scale structural failure. (c) 2020 Published by Elsevier Ltd on behalf of Acta Materialia Inc.