Defect evolution in Fe using in-situ Fe-H-He triple-beam simultaneous irradiation under two orders of magnitude of dose rates with constant H/dpa and He/dpa ratios

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

Journal of Nuclear Materials Pub Date : 2025-09-08 DOI:10.1016/j.jnucmat.2025.156157

Ziqi Cao , Yifan Ding , Qinghong Zhong , Mengjie Wu , Guang Ran

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Abstract

The effectiveness and reliability of ion irradiation with high damage rates and without hydrogen and helium production to simulate neutron irradiation with low damage rates and with hydrogen and helium from nuclear reactions in the study of nuclear material irradiation damage has been questioned for a long time. In this work, the evolution of dislocation loops and helium bubbles in pure Fe was examined under Fe-H-He triple-beam simultaneous irradiation with two orders of magnitude (10⁻³ dpa/s-10⁻⁵ dpa/s) changes in the irradiation damage rate while maintaining constant hydrogen & helium-dose ratios (10 appm He/dpa and 45 appm H/dpa). The in-situ TEM analysis revealed the effect of dose rate on defect nucleation/growth: higher dose rates promote high density nucleation of dislocation loops and bubbles, but inhibit their growth. Lower dose rates, on the other hand, favour continuous growth of defects, leading to larger sizes and increased expansion rates. Based on experimental data, a comprehensive prediction equation for swelling ratio considering both dose rate and dose has been established. Additionally, irradiation hardening effects induced by loops demonstrate that high dose rates increase the density of <111> dislocation loops and inhibit their movement, thereby significantly improving material hardening. This study not only validates the feasibility of neutron damage simulation using triple-beam irradiation but also provides critical experimental support for predicting long-term service behaviour of nuclear materials.

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在恒定H/dpa和He/dpa比值下，原位Fe-H-He三束同步辐照Fe的缺陷演化

在核材料辐照损伤研究中，用高损伤率、不产氢、不产氦的离子辐照模拟低损伤率、核反应产生氢、氦的中子辐照的有效性和可靠性一直受到质疑。在Fe-H-He三束同时辐照下，在保持恒定的氢和氦剂量比（10 appm He/dpa和45 appm H/dpa）的情况下，以两个数量级（10−3 dpa/s-10−5 dpa/s）的辐照损伤率变化，研究了纯Fe中位错环和氦泡的演变。原位TEM分析揭示了剂量率对缺陷形核/生长的影响：较高的剂量率促进了位错环和气泡高密度形核，但抑制了它们的生长。另一方面，较低的剂量率有利于缺陷的持续增长，导致更大的尺寸和增加的膨胀率。根据实验数据，建立了考虑剂量率和剂量的溶胀比综合预测方程。此外，环诱导的辐照硬化效应表明，高剂量率增加了<；111>；位错环的密度，抑制了它们的运动，从而显著改善了材料的硬化。该研究不仅验证了三束辐照中子损伤模拟的可行性，而且为预测核材料的长期使用行为提供了关键的实验支持。

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.