Enhanced cryogenic tensile properties in a Fe-high-entropy alloy

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2025-02-08 DOI:10.1016/j.jallcom.2025.179052

Hailong Yi, Cheng Tao, Chao Chen, Jiarui Fan, Shiwei Wang

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引用次数: 0

Abstract

Face-centered cubic (FCC) high-entropy alloys (HEAs) typically exhibit excellent ductility and are expected to be used in cryogenic engineering applications. However, their moderate yield strength at cryogenic temperatures (typically below 1 GPa) and the high cost of the alloys limit their application. In this paper, we report a (Fe₆₂Ni₁₆Co₉Mn₉Ti₄)₉₇Si₃ Fe-high-entropy alloy (Fe-HEA) with excellent cryogenic tensile strength (yield strength and ultimate tensile strength of 1325 MPa and 1446 MPa, respectively) and ductility (uniform elongation of 20 %). The ultrahigh cryogenic yield strength and uniform elongation of our alloy stem primarily from superior work-hardening and strain-hardening capabilities induced by the heterogeneous structures of bimodal grains and dual phase, FCC → BCC / HCP martensitic transformation, ductile nano-precipitates ((Fe, Ni)₂SiTi), nano-twins, stacking faults, and Lomer-Cottrell locks. The findings of this study provide new insights for developing Fe-HEAs with a good combination of yield strength and ductility at cryogenic temperatures.

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fe -高熵合金的低温拉伸性能增强

面心立方（FCC）高熵合金（HEAs）具有优异的延展性，有望在低温工程中得到应用。然而，它们在低温下的中等屈服强度（通常低于1 GPa）和合金的高成本限制了它们的应用。本文报道了一种具有优异低温抗拉强度（屈服强度1325 MPa，极限抗拉强度1446 MPa）和延展性（均匀伸长率20%）的（Fe62Ni16Co9Mn9Ti4）97Si3铁高熵合金（Fe-HEA）。该合金的超高低温屈服强度和均匀伸长率主要源于双峰晶和双相的非均质组织、FCC→BCC / HCP马氏体相变、延展性纳米析出相（(Fe, Ni)2SiTi）、纳米孪晶、层错和lomo - cottrell锁引起的优越的加工硬化和应变硬化能力。本研究结果为开发具有低温屈服强度和低温塑性良好结合的Fe-HEAs提供了新的见解。

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

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.