Recycling-Inspired Design and Development of an Ultrafine-Grained Phase-Separated High Entropy Alloy

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-10-01 DOI:10.1016/j.jallcom.2025.184155

R. Yara, M.K. Singh, N.K. Chaitanya, M. Gor, U. Sunkari, Y. Miyajima, P.P. Bhattacharjee

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Abstract

Recycling-inspired design and development of a novel phase-separated high entropy alloy (PS-HEA) Co₂₀Cr₂₆Fe₂₀Mn₂₀Ni₁₄)_0.75Cu_0.25 was carried out in this work. The HEA consisted of Cu-rich FCC1 and Cu-lean FCC2 phases and showed a core-shell morphology in the Cu-lean FCC2 phase due to the precipitation of the Cr-rich tetragonal σ-phase. Heavy cold-rolling resulted in the progressive formation of a banded or elongated morphology, deformation-driven fragmentation and dissolution of the σ-phase, and Cr-supersaturation near the σ-phase. Recrystallization was confined to the individual Cu-rich FCC1 and Cu-lean FCC2 bands, which resulted in considerable mutual hindrance to grain growth and the retention of a remarkable ultrafine microstructure compared to other HEAs. Meanwhile, annealing resulted in the formation of σ-phase nanoprecipitates within the Cu-lean FCC2 phase. Solid solution, Hall-Petch strengthening due to ultrafine microstructure, and Orowan-Ashby strengthening due to the nanoprecipitates resulted in a remarkable improvement in yield strength to ~850 MPa with an elongation of ~5-6%. The results highlighted the potential of PS-HEAs as a novel class of HEAs with tunable microstructure and properties for structural applications.

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超细晶相分离高熵合金的循环设计与研制

以循环为灵感设计开发了一种新型相分离高熵合金（PS-HEA） Co20Cr26Fe20Mn20Ni14)0.75Cu0.25。HEA由富cu的FCC1相和贫cu的FCC2相组成，贫cu的FCC2相由于析出富cr的四方σ相而呈现核壳形态。冷轧导致合金逐渐形成条形或细长形，形变导致σ相碎裂和溶出，cr在σ相附近过饱和。与其他HEAs相比，重结晶局限于单个富cu FCC1和贫cu FCC2带，这对晶粒生长造成了相当大的相互阻碍，并保留了显著的超细微观结构。同时，退火导致贫cu FCC2相内形成σ相纳米沉淀。固溶、超细组织形成的Hall-Petch强化和纳米沉淀形成的Orowan-Ashby强化使屈服强度显著提高到~850 MPa，延伸率达到~5-6%。这些结果突出了PS-HEAs作为一类具有可调结构和性能的新型HEAs的潜力。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.