堆垛层错能对<strong>CrMnFeCoNi</strong>系高熵合金动态力学性能与变形机制的影响

doi:10.11900/0412.1961.2024.00133

金属学报

2025, Vol. 61

Issue (12): 1817-1828 DOI: 10.11900/0412.1961.2024.00133

研究论文

本期目录 | 过刊浏览

堆垛层错能对CrMnFeCoNi系高熵合金动态力学性能与变形机制的影响

尹仕攀¹, 孟泽宇¹, 贺竞瑶¹, 李泽洲¹^,²^,³, 张帆¹^,²^,³(

), 程兴旺¹^,²^,³(

)

1 北京理工大学材料学院北京 100081
2 北京理工大学冲击环境材料技术国家级重点实验室北京 100081
3 北京理工大学唐山研究院唐山 063000

Effect of Stacking Fault Energy on the Dynamic Mechanical Properties and Deformation Mechanisms of CrMnFeCoNi High-Entropy Alloys

YIN Shipan¹, MENG Zeyu¹, HE Jingyao¹, LI Zezhou¹^,²^,³, ZHANG Fan¹^,²^,³(

), CHENG Xingwang¹^,²^,³(

)

1 School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2 National Key Laboratory of Science and Technology on Materials Under Shock and Impact, Beijing Institute of Technology, Beijing 100081, China
3 Tangshan Research Institute, Beijing Institute of Technology, Tangshan 063000, China

引用本文:

尹仕攀, 孟泽宇, 贺竞瑶, 李泽洲, 张帆, 程兴旺. 堆垛层错能对CrMnFeCoNi系高熵合金动态力学性能与变形机制的影响[J]. 金属学报, 2025, 61(12): 1817-1828.
Shipan YIN, Zeyu MENG, Jingyao HE, Zezhou LI, Fan ZHANG, Xingwang CHENG. Effect of Stacking Fault Energy on the Dynamic Mechanical Properties and Deformation Mechanisms of CrMnFeCoNi High-Entropy Alloys[J]. Acta Metall Sin, 2025, 61(12): 1817-1828.

全文: PDF(4361 KB) HTML

摘要:

为了探明堆垛层错能对CrMnFeCoNi系高熵合金动态力学响应行为的影响，本工作以具有不同堆垛层错能的等比例CrMnFeCoNi (35 mJ/m²)和非等比例Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄ (23 mJ/m²)高熵合金为研究对象，通过准静态和动态压缩性能测试，对比研究了不同堆垛层错能CrMnFeCoNi系高熵合金的动态力学性能特点；利用EBSD和TEM技术观察分析了变形组织，研究了不同堆垛层错能高熵合金的变形机制。结果表明，动态压缩条件下，CrMnFeCoNi和Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄高熵合金均表现出显著的应变率强化效应；准静态、动态压缩条件下，合金的流变应力、加工硬化指数和吸能能力均随着堆垛层错能的降低而增加。准静态变形时，CrMnFeCoNi高熵合金变形以位错滑移为主；Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄高熵合金以位错滑移和孪生为主。动态压缩变形时，孪生行为对变形的贡献增加，CrMnFeCoNi高熵合金的变形模式主要为位错滑移和孪生；堆垛层错能更低的Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄高熵合金在动态变形过程中除了位错滑移和孪生，还发生了孪晶交互作用与fcc-hcp相变以协调变形，该合金表现出更高的流变应力、加工硬化指数和吸能能力。可见，堆垛层错能的变化通过影响变形模式实现高熵合金动态力学性能的提升。

关键词 ：高熵合金, 堆垛层错能, 动态变形, 力学性能, 变形机制

Abstract：

CrMnFeCoNi high-entropy alloys (HEAs) have attracted considerable attention because of their excellent mechanical properties. Furthermore, these alloys exhibit high energy absorption characteristics under high-strain rate deformation for various deformation modes. The stacking fault energy (SFE) plays a crucial role in improving the deformation modes and mechanical properties. Only few studies have investigated the effect of SFE on the dynamic mechanical properties and deformation mode of CrMnFeCoNi series HEAs. In this work, the effect of SFE on the dynamic mechanical properties and deformation mechanism of CrMnFeCoNi HEAs were investigated through quasi-static and dynamic mechanical tests and microstructural analysis using CrMnFeCoNi (SFE of 35 mJ/m²) and Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄ (SFE of 23 mJ/m²) HEAs. Results indicate that CrMnFeCoNi and Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄ HEAs exhibit a strain-rate hardening effect under dynamic deformation. Furthermore, the flow stress, energy absorption ability, and work hardening index increase under static and dynamic conditions with the decrease in SFE. Under quasi-static compression, deformation occurs via dislocation gliding in CrMnFeCoNi, whereas deformation twinning is profound in Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄ HEA with low SFE; therefore, deformation is dominated by dislocation slip and twinning. The contribution of deformation twinning to the deformation strain increases with the increase in strain rates. In particular, deformation occurs via dislocation gliding and twinning in CrMnFeCoNi HEA. Apart from dislocation slip and twinning, the interaction of twins and the transition from fcc to hcp structures provide additional deformation modes to accommodate the plastic deformation of Cr₂₆Mn₂₀Fe₂₀Co₂₀Ni₁₄ HEA and improve the mechanical properties and energy absorption of these alloys. This work demonstrates that the change in SFE will lead to different deformation modes for accommodating plastic strain, thereby improving the mechanical properties of HEAs.

Key words： high-entropy alloy stacking fault energy dynamic deformation mechanical property deformation mechanism

收稿日期: 2024-05-07

ZTFLH:

TG113.25

基金资助:国家自然科学基金项目(52271141);冲击环境材料技术国家级重点实验室基金项目(DZC2022-1)

通讯作者: 张帆，fanzhang@bit.edu.cn，主要从事极端加载条件下先进金属材料的设计、变形机制及应用研究; 程兴旺，chengxw@bit.edu.cn，主要从事新型毁伤与防护材料、材料动态力学行为和微结构演化机制研究

Corresponding author: ZHANG Fan, professor, Tel: 13581586228, E-mail: fanzhang@bit.edu.cn; CHENG Xingwang, professor, Tel: (010)68913951, E-mail: chengxw@bit.edu.cn

作者简介: 尹仕攀，男，1993年生，博士生

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图1 CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金的EBSD像

图2 CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金的室温准静态压缩真应力-应变曲线和加工硬化率曲线

图3 CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金的动态压缩真应力-应变曲线

图4 变形应变率为1 × 10-3、2 × 103和5 × 103 s-1时CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金lnσ-lnε曲线

图5 CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金的lnσ-lnε˙曲线

图6 CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金的吸能特性

图7 1 × 10-3 s-1应变率加载条件下，真应变为0.25时，不同堆垛层错能高熵合金变形组织的EBSD分析

图8 1 × 10-3 s-1应变率加载条件下，真应变为0.25时，不同堆垛层错能高熵合金变形组织的TEM像、高分辨TEM (HRTEM)像及选区电子衍射(SAED)花样

图9 5 × 103 s-1应变率加载条件下，真应变为0.25时，CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金变形组织的EBSD分析

图10 5 × 103 s-1应变率加载条件下，真应变为0.25时，CrMnFeCoNi和Cr26Mn20Fe20Co20Ni14高熵合金的TEM分析

图11 应变率与堆垛层错能对CrMnFeCoNi系高熵合金变形模式的影响

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