Effect of heat treatment on hydrogen embrittlement susceptibility of Al0.25CoCrFeNi high entropy alloy

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2024-05-10 DOI:10.1016/j.engfailanal.2024.108432

Min Liu , Wenjing Lu , Fangjie Li , Shidong Zhang , Qin Shen , Menglu Jian , Zhongyi Lei , Zhanyong Wang

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引用次数: 0

Abstract

In this study, the influences of annealing and aging treatments on the hydrogen embrittlement (HE) behavior of the cryo-rolled Al_0.25CoCrFeNi high entropy alloy (HEA) were investigated through tensile tests and electrochemical hydrogen charging experiments. The results found that the aged sample showed high strength but was more susceptible to HE. A trade-off between the strength and HE resistance was achieved in the annealed + aged sample. Electron backscatter diffraction analysis and fracture characteristics were performed to clarify the HE mechanism. The high dislocation density and aggregated second phase along the grain boundaries in the aged sample were the important factors to help the initiation of HE crack, and then increasing the HE susceptibility. The annealed + aged sample with low dislocation density and aging precipitation reduced the risk of hydrogen-induced cracking and resulting in the excellent HE resistance. This work offered the method to obtain a comprehensive improvement in the strength and HE resistance of this alloy.

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热处理对 Al0.25CoCrFeNi 高熵合金氢脆敏感性的影响

本研究通过拉伸试验和电化学充氢实验，研究了退火和时效处理对低温轧制的 Al0.25CoCrFeNi 高熵合金（HEA）氢脆（HE）行为的影响。结果发现，老化样品具有较高的强度，但更容易受到 HE 的影响。退火+老化的样品在强度和抗 HE 能力之间实现了权衡。通过电子反向散射衍射分析和断裂特征研究，阐明了 HE 的机理。老化样品中的高位错密度和沿晶界聚集的第二相是导致高热裂纹萌发并进而增加高热敏感性的重要因素。退火+老化样品的低位错密度和老化析出降低了氢致开裂的风险，因而具有优异的抗氢致开裂性能。这项研究为全面提高该合金的强度和抗氢裂性能提供了方法。

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

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.