Revealing the synergistic effects of sequential and simultaneous dual beam irradiations in tungsten via in-situ TEM
Revealing the synergistic effects of sequential and simultaneous dual beam irradiations in tungsten via in-situ TEM
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DOI：
10.1016/j.jnucmat.2020.152150
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发表时间：
2020-09-01
影响因子：
3.1
通讯作者：
Maloy, S. A.
中科院分区：
文献类型：
--
作者：
El-Atwani, O.;Cunningham, W. S.;Maloy, S. A.
阐明不同高能束流对核材料辐射响应的协同效应，对于改进暴露于极端环境下的核材料评估方法至关重要。本文介绍了在1223 K温度下对钨进行的原位顺序（He注入，然后Kr辐照，反之亦然）和同时（重离子Kr辐照和He注入）双束辐照。位错环密度，平均面积和总环损伤作为辐照历史和剂量/注量的函数进行量化。还确定了每种条件下最终最大剂量下的环Burgers矢量和空腔损伤（空腔密度、尺寸和体积总变化）。回路损伤演化在所有情况下是不同的，与最小的回路损伤中观察到的同步实验。在氪刺He实验中，氪在He注入过程中产生的位错环的湮灭是一个意想不到的观察结果，可以用位错环下沉强度和随时间变化的缺陷通量的动态演变来解释。位错环筏形成，扩展缺陷附近的裸露区，和空腔损伤进行了比较，在不同的条件。在这项工作中观察到的现象和讨论将刺激进一步的实验和计算建模活动，导致改进的核材料的反应堆相似的环境下的辐射响应的基本理解。出版社：Elsevier B. V.
Elucidating the synergistic effects of different energetic beams on the radiation response of nuclear materials is critical for developing an improved methodology for their evaluation when exposed to extreme environments. This article describes in-situ sequential (He implantation followed by Kr irradiation and vice-versa) and simultaneous (heavy ion Kr irradiation and He implantation) dual beam irradiations performed on tungsten at 1223 K. Dislocation loop density, average area, and total loop damage as a function of irradiation history and dose/fluence are quantified. The loop Burgers vectors and cavity damage (cavity density, size and total change in volume) are also determined at the final maximum dose for each condition. The loop damage evolution was different in all cases, with the smallest loop damage observed in the simultaneous experiment. Annihilation of Kr generated dislocation loops during He implantation in the Kr thorn He experiment was an unanticipated observation that may be explained by the dynamic evolution of dislocation loop sink strengths and time-dependent defect fluxes. Dislocation loop raft formation, denuded zones near extended defects, and cavity damage are compared across the different conditions. The phenomena observed and discussed in this work will stimulate further experimental and computational modeling activities leading to improved fundamental understanding of the irradiation response of nuclear materials under reactor-similar environments. Published by Elsevier B.V.