不完全再结晶Fe40Mn10Cr25Ni25高熵合金的室温及低温力学性能

doi:10.13251/j.issn.0254-6051.2021.06.032

金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 160-167.DOI: 10.13251/j.issn.0254-6051.2021.06.032

不完全再结晶Fe₄₀Mn₁₀Cr₂₅Ni₂₅高熵合金的室温及低温力学性能

武雅桃¹, 黄德军², 杨慧君^1,3, 张敏¹, 乔珺威^1,3

1.太原理工大学材料科学与工程学院, 山西太原 030024;
2.(中国)上海思百吉仪器系统有限公司, 上海 201100;
3.太原理工大学新材料界面科学与工程教育部重点实验室, 山西太原 030024

收稿日期:2021-04-16 出版日期:2021-06-25 发布日期:2021-07-21
通讯作者: 乔珺威,教授,博士生导师,E-mail:qiaojunwei@gmail.com
作者简介:武雅桃(1994—),女,硕士研究生,主要研究方向为高熵合金的变形行为,E-mail:wuyatao3@hotmail.com。
基金资助:
山西省自然科学基金(201901D111105,201901D111114);新金属材料国家重点实验室开放课题(2020-Z09)

Room temperature and cryogenic temperature mechanical properties of partially recrystallized Fe₄₀Mn₁₀Cr₂₅Ni₂₅ high-entropy alloy

Wu Yatao¹, Huang Dejun², Yang Huijun^1,3, Zhang Min¹, Qiao Junwei^1,3

1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan Shanxi 030024, China;
2. Malvern Panalytical (China) Co., Ltd., Shanghai 201100, China;
3. Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan Shanxi 030024, China

Received:2021-04-16 Online:2021-06-25 Published:2021-07-21

摘要/Abstract

摘要： 采用冷轧和退火热处理工艺制备了不完全再结晶结构的Fe₄₀Mn₁₀Cr₂₅Ni₂₅高熵合金,分析了合金的室温(298 K)及低温(77 K)拉伸时的力学性能。结果表明,合金具有优良的室温及低温力学性能,合金在低温拉伸时强度和塑性均得到了提高,其室温强度和断后伸长率分别为880 MPa和18%,低温强度和断后伸长率分别为1360 MPa和36%。合金在室温变形以位错滑移为主,低温变形以位错滑移和孪生为主。室温拉伸时,粗晶晶粒先于细晶晶粒变形,导致试样内部产生了应变梯度,提高了合金的加工硬化率,使合金在室温下具有良好的强塑性。低温拉伸时,粗晶晶粒中形成了大量的变形孪晶,从而提高了合金的低温力学性能。

关键词: 高熵合金, 显微组织, 力学性能, 位错, 孪晶

Abstract: The Fe₄₀Mn₁₀Cr₂₅Ni₂₅ high-entropy alloy (HEA) with partial recrystallization was prepared by cold rolling and subsequent annealing. The tensile properties of the alloy at room temperature (298 K) and cryogenic temperature (77 K) were studied. The results show that the alloy has excellent room temperature and cryogenic temperature mechanical properties. Both the strength and ductility of the alloy are improved under tension at cryogenic temperature. The strength and percentage elongation after fracture at room temperature are 880 MPa and 18% respectively, and 1360 MPa and 36% respectively at 77 K. The tensile deformation of the alloy at room temperature is dominated by dislocation slip, but by dislocation slip and twinning at cryogenic temperature. The coarse grains deform before fine grains under tensile stress at room temperature, resulting in a strain gradient inside the specimen, so that the work hardening rate of the alloy is increased, the alloy exhibits excellent combination of strength and ductility at room temperature. A large quantity of high-density deformation twins are formed in the coarse grains under tensile stress at cryogenic temperature, so that the cryogenic temperature mechanical properties of the alloy can be improved.

Key words: high-entropy alloy, microstructure, mechanical properties, dislocation, twin

中图分类号:

TG139

武雅桃, 黄德军, 杨慧君, 张敏, 乔珺威. 不完全再结晶Fe₄₀Mn₁₀Cr₂₅Ni₂₅高熵合金的室温及低温力学性能[J]. 金属热处理, 2021, 46(6): 160-167.

Wu Yatao, Huang Dejun, Yang Huijun, Zhang Min, Qiao Junwei. Room temperature and cryogenic temperature mechanical properties of partially recrystallized Fe₄₀Mn₁₀Cr₂₅Ni₂₅ high-entropy alloy[J]. Heat Treatment of Metals, 2021, 46(6): 160-167.

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不完全再结晶Fe₄₀Mn₁₀Cr₂₅Ni₂₅高熵合金的室温及低温力学性能

Room temperature and cryogenic temperature mechanical properties of partially recrystallized Fe₄₀Mn₁₀Cr₂₅Ni₂₅ high-entropy alloy

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