Effect of Cr/Al ratio on the microstructure and mechanical properties of CoFeNiCrxAl1−x high-entropy alloys

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-01-23 DOI:10.1063/5.0249769

Hongquan Song, Chuangshi Feng, Zhou Guan, Wei Zhang, Hengyong Yang, Yu Tang, Kai Zeng, Xin Yuan, Jiawei Zhang, Jia Liu, Fuxiang Zhang

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引用次数: 0

Abstract

Achieving strength-ductility and functional integration is a key issue to promote the application of alloys in the field of functional materials. CoFeNiCrxAl1−x alloys exhibit excellent magnetic and corrosion resistance properties; however, their mechanical properties remain underexplored and insufficiently understood. In this work, the microstructure and mechanical properties of CoFeNiCrxAl1−x alloys were investigated, and their intrinsic deformation mechanisms were elucidated. The results indicate that as Cr is gradually replaced by Al, the phase structure transforms from a single-phase face-centered cubic (FCC) structure to a dual-phase FCC and body-centered cubic (BCC), and finally to a BCC/B2 structure. Mechanical tests demonstrated that alloy hardness rises with higher Al content, with the Cr0Al1 alloy exhibiting a hardness approximately 3.3 times greater than that of the Cr1Al0 alloy. Notably, the Cr0.5Al0.5 alloy exhibits an optimal strength-ductility balance, with a yield strength increase in about 60% to 248 MPa and tensile strength increase in about 36% to 610 MPa, while maintaining nearly the same ductility as the Cr1Al0 alloy. The deformation mechanisms were found to be driven by solid solution strengthening due to severe lattice distortion, a high dislocation density resulting from reduced dislocation formation energy, the second-phase strengthening and interface strengthening via the micrometer-scale BCC phase, and twin-induced plasticity induced by the reduced stack fault energy. This work broadens the potential applications of CoFeNiCrxAl1-x alloys as versatile engineering and magnetic functional materials.

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Cr/Al比对CoFeNiCrxAl1−x高熵合金组织和力学性能的影响

实现合金的强度-塑性与功能一体化是促进合金在功能材料领域应用的关键问题。CoFeNiCrxAl1−x合金具有优异的磁性和耐腐蚀性；然而，它们的力学特性仍未被充分探索和理解。本文研究了CoFeNiCrxAl1−x合金的显微组织和力学性能，并阐明了其固有变形机制。结果表明：随着Cr逐渐被Al取代，相结构由单相面心立方（FCC）结构转变为双相FCC -体心立方（BCC）结构，最终转变为BCC/B2结构；力学试验表明，合金硬度随Al含量的增加而升高，Cr0Al1合金的硬度约为Cr1Al0合金的3.3倍。值得注意的是，Cr0.5Al0.5合金表现出最佳的强度-塑性平衡，屈服强度提高约60%至248 MPa，抗拉强度提高约36%至610 MPa，同时保持与Cr1Al0合金基本相同的塑性。变形机制主要有：严重的晶格畸变导致的固溶强化、位错形成能量降低导致的高位错密度、微米级BCC相的第二相强化和界面强化以及层错能量降低导致的双致塑性。这项工作拓宽了CoFeNiCrxAl1-x合金作为多功能工程和磁性功能材料的潜在应用。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.