In situ study on enhanced heavy ion irradiation tolerance of porous Mg
In situ study on enhanced heavy ion irradiation tolerance of porous Mg
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DOI：
10.1016/j.scriptamat.2017.09.018
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发表时间：
2018-02-01
影响因子：
6
通讯作者：
Zhang, X.
中科院分区：
文献类型：
--
作者：
Li, Jin;Chen, Y.;Zhang, X.
众所周知，镁极易受到辐射损伤。在这里，我们通过透射电子显微镜下的原位氪离子辐照研究表明，与致密的粗粒Mg相比，多孔Mg中的缺陷密度和尺寸都大大减少了。在粗粒Mg中，低剂量时形成棱柱位错环和基位错环，高剂量时形成基位错环。同时，在辐照多孔Mg中，基底环在整个辐照过程中占主导地位。讨论了提高多孔镁辐照耐受性的机理。(C) 2017材料学报Elsevier Ltd.出版。版权所有。
Mg is known to be highly vulnerable to irradiation damage. Here we show, via in situ Kr ion irradiation studies inside a transmission electron microscope, that both defect density and size have been reduced substantially in porous Mg compared to dense coarse-grained Mg counterpart. Both prism and basal dislocation loops form at low dose in coarse-grained Mg, but basal loops dominate at a higher dose level. Meanwhile, in irradiated porous Mg, basal loops prevail throughout the entire irradiation process. Mechanisms that lead to enhanced irradiation tolerance of porous Mg are discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.