Ultrastrong nanocrystalline FeCoNiCr high entropy alloy with outstanding thermal stability

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-04-02 DOI:10.1016/j.msea.2025.148282

Guoying Liu, Youyue Jiang, Chenjing Ma, Zhen Yuan, Baoru Sun, Tongde Shen

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引用次数: 0

Abstract

FeCoNiCr-based high-entropy alloys (HEAs) exhibit excellent irradiation resistance and outstanding mechanical performance, particularly at cryogenic temperatures, rendering them strong candidates for manufacturing high-performance parts in extreme environments. Nanocrystalline (NC) FeCoNiCr-based HEAs exhibit greater strength compared to their coarse-grained (CG) equivalents. Yet, their thermal stability is often subpar. The reason is that the nanograins experience considerable coarsening upon heating to a temperature between 0.4 and 0.6 of their melting point (T_m). In this work, we report an NC FeCoNiCr HEA, containing 1 at% lanthanum (NC FeCoNiCr-La HEA), synthesized via mechanical alloying (MA) and high temperature & high pressure (HTHP) sintering methods, with an average grain diameter of 59 nm and an exceptionally high hardness of 715 HV, displaying prominent thermal stability up to 1000 °C (0.74T_m). The thermal stability is explained by the segregation of elemental lanthanum and La-O-rich nanoprecipitates (NPs) at the grain boundaries (GBs).

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.