Ordering-facilitated lower hydrogen embrittlement sensitivity in a prototype high-entropy alloy

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-18 DOI:10.1016/j.matchar.2024.114473

引用次数: 0

Abstract

The ageing treatment (450 °C/60 h) led to the spinodal decomposition at grain boundaries (GBs) and the development of chemical short-range orders (CSROs) in the alloy matrix, increasing the strength and effectively reducing the hydrogen embrittlement (HE) sensitivity of the equiatomic FeMnNiCoCr alloy. Firstly, the emergence of NiMn- and Cr-rich orders at GB regions reduces hydrogen diffusion rates along GBs and limits hydrogen enrichment at these sites. Secondly, CSROs promote hydrogen accumulation within the grain interior and impede hydrogen penetration, resulting in a shallower hydrogen-affected depth in the aged sample. Moreover, the modulation of hydrogen distribution by microstructure initiates transgranular cracking in the aged sample.

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原型高熵合金中的有序化促进降低氢脆敏感性

时效处理（450 °C/60小时）导致晶界（GBs）的旋光分解和合金基体中化学短程有序（CSROs）的发展，从而提高了等原子铁锰镍钴铬合金的强度并有效降低了氢脆（HE）敏感性。首先，在 GB 区域出现的富镍锰和富铬阶序降低了氢沿 GB 的扩散速率，限制了氢在这些部位的富集。其次，CSRO 促进了氢在晶粒内部的积累，阻碍了氢的渗透，从而使老化样品中受氢影响的深度更浅。此外，微观结构对氢分布的调节作用会引发老化样品中的跨晶裂纹。

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

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.