In situ studies on irradiation resistance of nanoporous Au through temperature-jump tests
In situ studies on irradiation resistance of nanoporous Au through temperature-jump tests
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DOI：
10.1016/j.actamat.2017.09.054
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发表时间：
2018-01-15
期刊：
影响因子：
9.4
通讯作者：
Zhang, X.
中科院分区：
文献类型：
--
作者：
Li, Jin;Fan, C.;Zhang, X.
纳米多孔材料由于其巨大的比表面积，在减轻辐照损伤方面具有巨大的潜力。先前在室温下对纳米多孔Au的原位辐照研究表明，由于吸收辐照诱导的缺陷，纳米孔收缩，并且收缩率是孔径依赖性的。在后续的温度依赖性研究中，我们发现缺陷密度和纳米孔都随着辐照温度的变化而变化。较高的温度导致较低的缺陷密度和降低的纳米孔收缩率。作为温度的函数的纳米孔的下沉强度估计。此外，与粗粒Au相比，纳米多孔Au表现出显著增强的抗溶胀性。纳米多孔金属的温度依赖性的耐辐照性的潜在机制进行了讨论。(C)2017 Acta Materialia Inc.由Elsevier出版。公司. All rights reserved.
Nanoporous materials have great potentials to alleviate irradiation-induced damage due to their giant surface-to-volume ratio. Previous in situ irradiation study on nanoporous Au at room temperature has shown the shrinkage of nanopores due to the absorption of irradiation-induced defects, and the shrinkage rate is pore-size-dependent. In this follow-up temperature-dependent study, we show that both defect density and nanopores evolve with irradiation temperature. Higher temperature results in lower defect density and reduced shrinkage rate of nanopores. The sink strength of nanopores as a function of temperature is estimated. Moreover, nanoporous Au exhibits significantly enhanced swelling resistance compared to coarse-grained Au. Potential mechanisms for temperature dependent irradiation resistance of nanoporous metals are discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier. Ltd. All rights reserved.