Microstructural evolution and tensile deformation behaviors of fine-grained Fe40Mn20Co20Cr15Si5 high entropy alloy prepared by friction stir processing

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2026-03-01 Epub Date: 2026-04-24 DOI:10.1016/S1003-6326(25)67001-4

Jia LIN , Yuan FANG , Wen WANG , Peng HAN , Ting ZHANG , Qiang LIU , Ya-ting XIANG , Feng-ming QIANG , Ke QIAO , Kuai-she WANG

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Abstract

A fine-grained metastable dual-phase Fe₄₀Mn₂₀Co₂₀Cr₁₅Si₅ high entropy alloy (CS-HEA) with excellent strength and ductility was successfully prepared by friction stir processing (FSP). The microstructural and mechanical properties of the fine-grained CS-HEA were characterized. The results showed that as-cast shrinkage cavities and elemental segregation were eliminated. The average grain size was refined from 121.1 to 5.4 μm. The face-centered cubic phase fraction increased from 23% to 82%. During tensile deformation, dislocation slip dominated at strains ranging from 5% to 17%, followed by transformation induced plasticity (TRIP) from 17% to 26%, and twin induced plasticity (TWIP) from 26% to 37%. The yield strength, ultimate tensile strength, and elongation of the fine-grained CS-HEA were 503 MPa, 1120 MPa, and 37%, respectively. The strength−ductility synergy of fine-grained CS-HEA was attributed to the combined effects of TRIP, TWIP, dislocation strengthening, and fine-grained strengthening.

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搅拌摩擦法制备细晶Fe40Mn20Co20Cr15Si5高熵合金的组织演变及拉伸变形行为

采用搅拌摩擦加工（FSP）成功制备了具有优良强度和延展性的细晶亚稳双相Fe40Mn20Co20Cr15Si5高熵合金（CS-HEA）。对细晶CS-HEA的显微组织和力学性能进行了表征。结果表明：消除了铸态缩孔和元素偏析。平均晶粒尺寸由121.1 μm细化至5.4 μm。面心立方相分数由23%提高到82%。拉伸变形过程中，在5% ~ 17%应变范围内，位错滑移占主导地位，其次是17% ~ 26%的相变诱发塑性（TRIP）和26% ~ 37%的孪晶诱发塑性（TWIP）。细晶CS-HEA的屈服强度为503 MPa，极限抗拉强度为1120 MPa，延伸率为37%。细晶CS-HEA的强度-塑性协同作用是TRIP、TWIP、位错强化和细晶强化的共同作用。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.