Evolution of helium bubbles induced by stress concentration in He-irradiated aluminium
Evolution of helium bubbles induced by stress concentration in He-irradiated aluminium
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DOI：
10.1016/j.matlet.2019.03.091
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发表时间：
2019-07
影响因子：
3
通讯作者：
H. Chen;Wen-qing Liu;Yang-Tse Cheng;J. Peng;Xue Liang;Lijuan Hu;Gang Wang
中科院分区：
文献类型：
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作者：
H. Chen;Wen-qing Liu;Yang-Tse Cheng;J. Peng;Xue Liang;Lijuan Hu;Gang Wang
通过在透射电子显微镜中的原位拉伸实验，证明了应力集中是非均匀应力场中氦泡演化的重要因素。在应力集中中，通过应力梯度驱动的气泡迁移和聚结以及应变时位错滑移诱导的空位吸收发生气泡生长。在具有相似尺寸的气泡合并之后，发生气泡形状演变。随着气泡生长到临界尺寸，随着进一步的应变，气泡逐渐伸长和消失。
By employing anin-situtension experiment in a transmission electron microscope, a stress concentration is demonstrated as a significant contributor to evolution of helium bubbles in a non-uniform stress field. In the stress concentration, a bubble growth occurs through bubble migration and coalescence driven by stress gradients as well as a dislocation slip-induced vacancy absorption upon straining. A bubble-shape evolution occurs after a coalescence of bubbles with similar size. As the bubbles grow to critical sizes, gradual elongation and disappearance of bubbles are found with further straining.