Tensile behavior of CoCrFeMnNi high-entropy alloy with intermediate strain rate included

IF 4.4 2区工程技术 Q1 MECHANICS

European Journal of Mechanics A-Solids Pub Date : 2024-08-06 DOI:10.1016/j.euromechsol.2024.105412

Bing Du , Yi Ding , Xin Bai , Muhammad Atif , Dongyang Qin , Yulong Li

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引用次数: 0

Abstract

High-entropy alloys (HEAs) have garnered considerable attention for their exceptional mechanical properties, positioning them as promising candidates for diverse industrial applications. This study investigates the mechanical properties of CoCrFeMnNi HEAs over a wide range of strain rates. Based on a novel electromagnetic loading device equipped with high-speed photography, intermediate strain rate tests of the HEAs are conducted. The intermediate strain rate test results show the effectiveness of the experiments. Experimental results exhibit a remarkable strain rate sensitivity of the HEA during tension tests. Microstructural analysis reveals the collaborative interplay between deformation twins and dislocations, enhancing strength-plasticity relationships under tension loading. Finally, a constitutive model (M-JCK) integrated by Johnson-cook model and KHL model is proposed to describe the mechanical behavior of HEAs. The results demonstrate that the M-JCK model outperforms traditional models, providing enhanced accuracy in capturing the complex responses of HEAs across varying strain rates.

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包含中间应变率的 CoCrFeMnNi 高熵合金的拉伸行为

高熵合金（HEAs）因其优异的机械性能而备受关注，成为各种工业应用的理想候选材料。本研究调查了 CoCrFeMnNi 高熵合金在各种应变速率下的机械性能。基于配备高速摄影功能的新型电磁加载装置，对 HEA 进行了中间应变速率测试。中间应变速率测试结果表明了实验的有效性。实验结果表明，在拉伸试验中，HEA 对应变速率具有显著的敏感性。微结构分析揭示了变形孪晶和位错之间的协同作用，从而增强了拉伸加载下的强度-塑性关系。最后，提出了一个由约翰森-库克模型和 KHL 模型集成的构成模型（M-JCK）来描述 HEA 的力学行为。结果表明，M-JCK 模型优于传统模型，能更准确地捕捉 HEA 在不同应变速率下的复杂响应。

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来源期刊

European Journal of Mechanics A-Solids 物理-力学

CiteScore

7.00

自引率

7.30%

发文量

275

审稿时长

48 days

期刊介绍： The European Journal of Mechanics endash; A/Solids continues to publish articles in English in all areas of Solid Mechanics from the physical and mathematical basis to materials engineering, technological applications and methods of modern computational mechanics, both pure and applied research.