Enhanced migration of mono-vacancies in AlxFeCoCrNi high entropy alloys

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Journal of Alloys and Compounds Pub Date : 2024-11-25 DOI:10.1016/j.jallcom.2024.177704

Xudong An, Eryang Lu, Ilja Makkonen, Guanying Wei, Jesper Byggmästar, Jiulong Zhu, Kenichiro Mizohata, Zhehao Chen, Flyura Djurabekova, Wangyu Hu, Huiqiu Deng, Tengfei Yang, Filip Tuomisto

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Abstract

A profound understanding of the fundamental properties of point defects in high entropy alloys (HEAs) is essential to predict their irradiation properties. In this work, particle irradiation was performed to produce point-like defects in the samples, and positron annihilation spectroscopy experiments combined with advanced theoretical modeling to directly reveal the influence of Al content on mono-vacancy migration in Al_xFeCoCrNi HEAs. The results show that the addition of Al to the alloy promotes the migration and recovery of irradiation-induced mono-vacancies. The Al enhanced mono-vacancy recovery is caused by the easier removal of mono-vacancies in Al-rich environments, while the delayed vacancy recovery occurs mainly in Fe-rich and/or Cr-rich environments. The modification of the complex energy landscape encountered by the diffusing species by introduction of trace elements may be an efficient approach for designing alloys with improved radiation tolerance.

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AlxFeCoCrNi 高熵合金中单空位的强化迁移

深刻理解高熵合金（HEAs）中点缺陷的基本特性对于预测其辐照特性至关重要。在这项工作中，通过粒子辐照在样品中产生点状缺陷，并结合正电子湮灭光谱实验和先进的理论建模，直接揭示了铝含量对 AlxFeCoCrNi 高熵合金中单空位迁移的影响。结果表明，在合金中添加铝可促进辐照诱导的单空位迁移和恢复。铝促进单空位恢复的原因是在富铝环境中单空位更容易被清除，而空位恢复延迟主要发生在富铁和/或富铬环境中。通过引入微量元素来改变扩散物种所遇到的复杂能谱，可能是设计具有更强辐射耐受性的合金的有效方法。

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 Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.