Dual Beam In Situ Radiation Studies of Nanocrystalline Cu
Dual Beam In Situ Radiation Studies of Nanocrystalline Cu
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DOI：
10.3390/ma12172721
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发表时间：
2019-08
期刊：
影响因子：
3.4
通讯作者：
C. Fan;Z. Shang;T. Niu;Jin Li;Haiyan Wang;Xinghang Zhang
中科院分区：
文献类型：
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作者：
C. Fan;Z. Shang;T. Niu;Jin Li;Haiyan Wang;Xinghang Zhang
纳米晶金属已经显示出增强的辐射耐受性，因为晶界作为用于去除辐射诱导的缺陷的有效缺陷汇。然而，纳米晶粒的热稳定性和辐射稳定性是令人关注的，因为当晶粒尺寸福尔斯在几纳米到几十纳米的范围内时，辐射可能会引起纳米晶体金属中的晶界迁移和晶粒粗化。此外，先前的纳米晶金属原位辐射研究主要集中在单重离子束辐射，很少考虑氦对损伤演化的影响。在这项工作中，我们利用原位单束（1 MeV Kr++）和双束（1 MeV Kr++和12 keV He+）辐照，研究了氦对纳米晶Cu在300 °C下的辐射响应和晶粒粗化的影响。对辐照前后的晶粒尺寸、取向和单个晶界特征进行了定量研究。统计结果表明，氦泡在晶界和晶粒内部可以延缓晶粒粗化。这些发现为研究纳米晶金属的辐射响应提供了新的视角。
Nanocrystalline metals have shown enhanced radiation tolerance as grain boundaries serve as effective defect sinks for removing radiation-induced defects. However, the thermal and radiation stability of nanograins are of concerns since radiation may induce grain boundary migration and grain coarsening in nanocrystalline metals when the grain size falls in the range of several to tens of nanometers. In addition, prior in situ radiation studies on nanocrystalline metals have focused primarily on single heavy ion beam radiations, with little consideration of the helium effect on damage evolution. In this work, we utilized in situ single-beam (1 MeV Kr++) and dual-beam (1 MeV Kr++ and 12 keV He+) irradiations to investigate the influence of helium on the radiation response and grain coarsening in nanocrystalline Cu at 300 °C. The grain size, orientation, and individual grain boundary character were quantitatively examined before and after irradiations. Statistic results suggest that helium bubbles at grain boundaries and grain interiors may retard the grain coarsening. These findings provide new perspective on the radiation response of nanocrystalline metals.