The influence of helium and heavy ion irradiations on radiation responses of single crystal Cu with nanovoids: An in situ TEM study
The influence of helium and heavy ion irradiations on radiation responses of single crystal Cu with nanovoids: An in situ TEM study
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DOI：
10.1016/j.actamat.2022.118293
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发表时间：
2022-08
期刊：
影响因子：
9.4
通讯作者：
C. Fan;Z. Shang;Meimei Li;Haiyan Wang;A. El-Azab;Xinghang Zhang
中科院分区：
文献类型：
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作者：
C. Fan;Z. Shang;Meimei Li;Haiyan Wang;A. El-Azab;Xinghang Zhang
氦是一种常见的核反应产物，它在辐照引起的空穴膨胀中起着重要的作用。尽管人们对氦在金属和合金中的效应进行了广泛的研究，但大多数研究都是基于辐照后的分析或计算机模拟。可以证明空洞如何在高温辐射下在He存在下演变的确凿证据仍然有限。在这项工作中，我们performedin situheavy离子辐照研究在透射电子显微镜，以比较在单晶铜中预先存在的纳米空洞的辐射响应受到单束的1 MeV的Kr离子和顺序的双束的14 keV的He离子和1 MeV的Kr离子在350 °C。我们的研究表明，纳米空隙将不断收缩，直到被消除时，由一个单一的氪离子束照射。相比之下，注入氦气的Cu中的纳米空洞可以达到稳定状态并最终停止收缩。此外，氦对重离子辐照下的空泡/气泡演化动力学的影响进行了讨论的框架内提出的临界气泡模型和气泡粗化模型。
Helium is a common nuclear reaction product, and it plays an important role in radiation-induced void swelling. Although extensive studies have been conducted to investigate the helium effects in metals and alloys, most of them were based on the post-irradiation analyses or computer simulations. Conclusive evidence that can demonstrate how voids evolve in the presence of He under high-temperature radiation remains limited. In this work, we performedin situheavy ion radiation studies in a transmission electron microscope to compare the radiation response of the preexisting nanovoids in single crystal copper subjected to a single beam of 1 MeV Kr ions and a sequential dual beam of 14 keV He ion and 1 MeV Kr ion at 350 °C. Our studies revealed that the nanovoids would contract continuously until being eliminated when irradiated by a single beam of Kr ions. In comparison, the nanovoids in helium-injected Cu could reach a stable state and eventually stopped shrinking. Moreover, the influence of helium on the kinetics of void/bubble evolution under heavy ion irradiation was discussed within the framework of a proposed critical bubble model and bubble coarsening model.