The effect of grain boundary on irradiation tolerance of U-Mo alloy: Defect evolution and mechanical properties

IF 1.4 3区物理与天体物理 Q3 INSTRUMENTS & INSTRUMENTATION

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms Pub Date : 2024-11-12 DOI:10.1016/j.nimb.2024.165561

Hang You , Xuelian Ou , Junjie Ai , Tengfei Ma , Xiaofeng Tian

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引用次数: 0

Abstract

The presence of grain boundaries (GBs) as an efficient defect sink can significantly impact the material’s radiation endurance. This study applied molecular dynamics (MD) methods to investigate the GB in U-Mo alloys interacted with defects caused by irradiation and the mechanical properties of the U-Mo alloys before and after irradiation. The results of this study indicate that the number of surviving defects is sensitive to both temperature and the distance between the primary knock-on atom (PKA) and the GBs. The numbers of residual interstitials and vacancies decrease with increasing temperature in GB models. Furthermore, vacancy cluster sizes decrease with increasing temperature, large-sized interstitial clusters cannot be formed at all three temperatures studied. The analysis of the efficiency of different GBs as sinks reveals that their ability to absorb defects is positively correlated with strain width. Compared with the SC models, the GB models have better resistance to irradiation.

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晶界对 U-Mo 合金辐照耐受性的影响缺陷演变与机械性能

晶界（GB）作为一种有效的缺陷汇，其存在会对材料的辐照耐受性产生重大影响。本研究采用分子动力学（MD）方法研究了 U-Mo 合金中与辐照造成的缺陷相互作用的 GB 以及 U-Mo 合金在辐照前后的力学性能。研究结果表明，存活缺陷的数量对温度和原敲原子（PKA）与 GB 之间的距离都很敏感。在 GB 模型中，残余间隙和空位的数量随着温度的升高而减少。此外，空位簇的大小随温度升高而减小，在研究的所有三个温度下都无法形成大尺寸的间隙簇。对不同 GB 作为汇的效率分析表明，它们吸收缺陷的能力与应变宽度呈正相关。与 SC 模型相比，GB 模型具有更好的抗辐照能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms 物理-核科学技术

CiteScore

2.80

自引率

7.70%

发文量

231

审稿时长

1.9 months

期刊介绍： Section B of Nuclear Instruments and Methods in Physics Research covers all aspects of the interaction of energetic beams with atoms, molecules and aggregate forms of matter. This includes ion beam analysis and ion beam modification of materials as well as basic data of importance for these studies. Topics of general interest include: atomic collisions in solids, particle channelling, all aspects of collision cascades, the modification of materials by energetic beams, ion implantation, irradiation - induced changes in materials, the physics and chemistry of beam interactions and the analysis of materials by all forms of energetic radiation. Modification by ion, laser and electron beams for the study of electronic materials, metals, ceramics, insulators, polymers and other important and new materials systems are included. Related studies, such as the application of ion beam analysis to biological, archaeological and geological samples as well as applications to solve problems in planetary science are also welcome. Energetic beams of interest include atomic and molecular ions, neutrons, positrons and muons, plasmas directed at surfaces, electron and photon beams, including laser treated surfaces and studies of solids by photon radiation from rotating anodes, synchrotrons, etc. In addition, the interaction between various forms of radiation and radiation-induced deposition processes are relevant.