Mechanistic insights into spinodal L12 nanostructures in mitigating radiation defect growth in Al0.5Cr0.9FeNi2.5V0.2 high-entropy alloys

IF 2.8 2区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Nuclear Materials Pub Date : 2025-02-16 DOI:10.1016/j.jnucmat.2025.155703

Zhengxiong Su, Jianqiang Wang, Jinxue Yang, Ping Zhang, Rui Gao, Chenyang Lu

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引用次数: 0

Abstract

High-entropy alloys with high-content L1₂ nanoprecipitates formed through phase separation have recently demonstrated outstanding mechanical properties across a wide temperature range, making them suitable structural materials for advanced nuclear systems. This study investigates the irradiation response of a high-entropy alloy composed of Al_0.5Cr_0.9FeNi_2.5V_0.2 with varying volumes of L1₂ nanostructures. High-temperature He ion irradiation was performed, and its effects on defect evolution were analyzed using transmission electron microscopy and nanoindentation. The results show that the spinodal order-disorder L1₂ network structure effectively suppresses irradiation-induced defects, as evidenced by reduced dislocation loop size, lower He bubble swelling, and decreased irradiation hardening in alloys with higher L1₂ volume fractions. This is primarily because the L1₂ structure, with its low-misfit coherent interface, undergoes the reversible order-disorder transition that reduces early irradiation point defects and suppresses defect nucleation and growth. Furthermore, the spinodal order-disorder L1₂ nanostructure impedes defect cluster movement by providing diffuse obstacles and forming antiphase boundaries, thereby slowing the growth of defects and He bubbles. This work provides an alloy design strategy to improve irradiation tolerance by exploiting the self-healing and structural complexity of the L1₂ structure.

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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.