热缺陷动力学驱动的快速低温辐照蠕变

IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Communications Materials Pub Date : 2024-10-09 DOI:10.1038/s43246-024-00655-5
Alexander Feichtmayer, Max Boleininger, Johann Riesch, Daniel R. Mason, Luca Reali, Till Höschen, Maximilian Fuhr, Thomas Schwarz-Selinger, Rudolf Neu, Sergei L. Dudarev
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引用次数: 0

摘要

在聚变反应堆设计中,反应堆部件出现高应力集中仍然是一个难以解决的现象。在这里,我们观察到了一种非线性高剂量辐射介导的微结构演化效应,并建立了定量模型,这种效应有助于在最具挑战性的低温极限下实现快速应力松弛。我们对暴露在高能离子束下的拉伸钨丝进行了现场观测,结果表明,高达 2 GPa 的内应力在几分钟内就会松弛,松弛的程度和时间尺度可通过原子模拟的无参数多尺度模型准确预测。与传统的辐射蠕变概念不同,这种效应源于纳米级晶体缺陷的自组织,通过热凝聚成扩展的极化位错网络,从而补偿并减轻了外部应力。在聚变反应堆中,暴露于中子辐照的活性冷却合金的蠕变行为预计将严重影响反应堆部件的运行 。
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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Fast low-temperature irradiation creep driven by athermal defect dynamics
The occurrence of high stress concentrations in reactor components is a still intractable phenomenon encountered in fusion reactor design. Here, we observe and quantitatively model a non-linear high-dose radiation mediated microstructure evolution effect that facilitates fast stress relaxation in the most challenging low-temperature limit. In situ observations of a tensioned tungsten wire exposed to a high-energy ion beam show that internal stress of up to 2 GPa relaxes within minutes, with the extent and time-scale of relaxation accurately predicted by a parameter-free multiscale model informed by atomistic simulations. As opposed to conventional notions of radiation creep, the effect arises from the self-organisation of nanoscale crystal defects, athermally coalescing into extended polarized dislocation networks that compensate and alleviate the external stress. The creep behavior of actively cooled alloys exposed to neutron irradiation in fusion reactors is expected to critically affect the operation of reactor components. Here, experiments and simulations of a 16 μm thick tungsten wire exposed to low-temperature irradiation reveal stress relaxation rates far exceeding those associated with thermal creep.
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来源期刊
Communications Materials
Communications Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
12.10
自引率
1.30%
发文量
85
审稿时长
17 weeks
期刊介绍: Communications Materials, a selective open access journal within Nature Portfolio, is dedicated to publishing top-tier research, reviews, and commentary across all facets of materials science. The journal showcases significant advancements in specialized research areas, encompassing both fundamental and applied studies. Serving as an open access option for materials sciences, Communications Materials applies less stringent criteria for impact and significance compared to Nature-branded journals, including Nature Communications.
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