Influence of damage rate on irradiation hardening behavior in proton-irradiated Fe-Cu alloy

IF 3.2 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-09-05 DOI:10.1016/j.jnucmat.2025.156148

Yusuke Noshi , Moe Ishiwaki , Ryoya Ishigami , Kazuhiro Yasuda , Ken-ichi Fukumoto

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Abstract

To investigate the effects of damage rate on irradiation-induced hardening and microstructural evolution, proton irradiation experiments were conducted on Fe-0.05 wt.%Cu binary alloy samples over a wide range of ion fluxes spanning three orders of magnitude. The samples were then subjected to nano-indentation tests and microstructural observations. Nano-indentation hardness tests revealed greater hardening at lower damage rates, even under the same damage level. TEM observation showed that larger but fewer dislocation loops formed under low damage rate conditions, while high damage rates produced smaller but denser dislocation loops. STEM/EDS analysis showed that as the damage rate decreased, the number density and diameter of Cu-rich precipitates increased, and the Cu concentration therein increased. Irradiation hardening contribution was estimated by invoking the dispersed-barrier hardening model and the Russell-Brown model indicating that the effect of damage rate on irradiation hardening controlled by CRPs is dominant. Since kinetic modeling simulation showed enhanced vacancy mobility at lower damage rates and enhanced Cu-rich precipitate formation, it supported the experimental results. Our findings suggest that damage rate has a significant effect on irradiation hardening behavior, and that low damage rate significantly contributes to the nucleation and growth process of Cu-rich precipitates by thermal diffusion during prolonged irradiation.

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损伤速率对质子辐照Fe-Cu合金辐照硬化行为的影响

为了研究损伤率对辐照诱导硬化和显微组织演变的影响，在三个数量级的离子通量范围内对Fe-0.05 wt.%Cu二元合金样品进行了质子辐照实验。然后对样品进行纳米压痕测试和微观结构观察。纳米压痕硬度测试显示，即使在相同的损伤水平下，在较低的损伤速率下也会有较大的硬化。TEM观察表明，低损伤率条件下形成的位错环较大但较少，而高损伤率条件下形成的位错环较小但较密集。STEM/EDS分析表明，随着损伤速率的降低，富Cu析出相的数量密度和直径增加，其中Cu浓度增加。采用分散屏障硬化模型和Russell-Brown模型估算辐照硬化贡献，表明损伤率对CRPs控制辐照硬化的影响占主导地位。由于动力学建模模拟表明，在较低的损伤速率下，空位迁移率增强，富cu沉淀形成增强，因此支持了实验结果。研究结果表明，损伤速率对辐照硬化行为有显著影响，低损伤速率显著促进了长时间辐照过程中富cu析出物的热扩散成核和生长过程。

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

Journal of Nuclear Materials 工程技术-材料科学：综合

CiteScore

5.70

自引率

25.80%

发文量

601

审稿时长

63 days

期刊介绍： The Journal of Nuclear Materials publishes high quality papers in materials research for nuclear applications, primarily fission reactors, fusion reactors, and similar environments including radiation areas of charged particle accelerators. Both original research and critical review papers covering experimental, theoretical, and computational aspects of either fundamental or applied nature are welcome. The breadth of the field is such that a wide range of processes and properties in the field of materials science and engineering is of interest to the readership, spanning atom-scale processes, microstructures, thermodynamics, mechanical properties, physical properties, and corrosion, for example. Topics covered by JNM Fission reactor materials, including fuels, cladding, core structures, pressure vessels, coolant interactions with materials, moderator and control components, fission product behavior. Materials aspects of the entire fuel cycle. Materials aspects of the actinides and their compounds. Performance of nuclear waste materials; materials aspects of the immobilization of wastes. Fusion reactor materials, including first walls, blankets, insulators and magnets. Neutron and charged particle radiation effects in materials, including defects, transmutations, microstructures, phase changes and macroscopic properties. Interaction of plasmas, ion beams, electron beams and electromagnetic radiation with materials relevant to nuclear systems.