Phase composition-guided design of nano strengthened high-entropy alloys for enhanced mechanical performance

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-08-14 DOI:10.1016/j.intermet.2025.108956

Li Feng, Gang Qin, Xu Yang, Yao Chen, Liang Wang, Ruirun Chen

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引用次数: 0

Abstract

Nanoprecipitation strengthening has demonstrated significant potential in enhancing the mechanical properties of high-entropy alloys (HEAs). However, the inherent compositional complexity of HEAs poses a critical challenge in designing compositions that enable the controllable formation of coherent nano-precipitates. In this study, we introduce a phase composition tracking strategy for the rational design of nano strengthened HEAs. Applying this strategy, we developed a Co₂₈Cr₃₀Cu₆Mn₁₅Ni₂₁ HEA, where dense coherent spinodal decomposition-induced nano-domains were successfully introduced by aging treatment at 600 °C for 5 h. The microstructure resulted in a remarkable 37 % enhancement in yield strength (from 315 ± 10 MPa to 433 ± 10 MPa) while simultaneously improving ductility (elongation increased from 48 ± 2 % to 53 ± 2 %) in room-temperature tensile tests. Mechanistic analysis indicates that the exceptional strength-ductility synergy stems from the strengthening contribution of coherent spinodal nano-domains. This work establishes a universal paradigm for designing high-performance HEAs with tailored nanoprecipitation strengthening, offering valuable insights into the development of compositionally complex alloys for extreme engineering applications.

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以相组成为导向的纳米强化高熵合金力学性能增强设计

纳米沉淀强化在提高高熵合金（HEAs）力学性能方面显示出巨大的潜力。然而，HEAs固有的成分复杂性对设计能够可控形成相干纳米沉淀物的组合物提出了关键挑战。在本研究中，我们引入了一种相组成跟踪策略，用于纳米强化HEAs的合理设计。利用这一策略，我们开发了Co28Cr30Cu6Mn15Ni21 HEA，在600°C时效5 h后，成功引入了致密相干spinodal分解诱导的纳米结构域。在室温拉伸试验中，该组织使屈服强度提高了37%（从315±10 MPa提高到433±10 MPa），同时提高了延展性（伸长率从48±2%提高到53±2%）。机制分析表明，这种特殊的强度-延性协同作用源于相干旋轴纳米结构域的强化贡献。这项工作为设计具有定制纳米沉淀强化的高性能HEAs建立了一个通用范例，为开发用于极端工程应用的复合合金提供了有价值的见解。

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

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.