Role of carbon on the enhanced strength-ductility synergy in a high-entropy alloy by multiple synergistic strategies

被引：5

作者：

Zhang, Tuanwei ^{[1
]}

Xiong, Renlong ^{[2
,3
]}

Bae, Jae Wung ^{[4
]}

Asghari-Rad, Peyman ^{[3
]}

Ahn, Soung Yeoul ^{[3
]}

Peng, Huabei ^{[5
]}

Wang, Zhihua ^{[1
]}

Kim, Hyoung Seop ^{[3
,6
]}

机构：

[1] Taiyuan Univ Technol, Inst Appl Mech, Coll Mech & Vehicle Engn, Taiyuan 030024, Peoples R China

[2] Wuhan Inst Technol, Sch Mech & Elect Engn, Hubei Prov Key Lab Chem Equipment Intensificat & I, Wuhan 430205, Peoples R China

[3] POSTECH Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 37673, South Korea

[4] Pukyong Natl Univ, Dept Met Engn, Busan 48513, South Korea

[5] Sichuan Univ, Sch Mech Engn, Chengdu 610065, Peoples R China

[6] Yonsei Univ, Inst Convergence Res & Educ Adv Technol, Seoul 03722, South Korea

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2024年 / 1003卷

基金：

中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

High-entropy alloy; Strength-ductility synergy; Interstitial atoms; Stacking fault energy; Deformation twins; Heterogeneous structure; STACKING-FAULT ENERGY; FE-MN; MECHANICAL-PROPERTIES; MARTENSITIC-TRANSFORMATION; PLASTICITY; MICROSTRUCTURE; TEMPERATURE; COMBINATION; DEPENDENCE; EVOLUTION;

D O I：

10.1016/j.jallcom.2024.175698

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A new Fe47Mn31Co10Cr10C2 high-entropy alloy (HEA) was developed to investigate the role of carbon in enhancing the strength-ductility synergy by utilizing multiple synergistic strengthening strategies with mitigating the adverse effect of carbon. Compared with the Fe40Mn40Co10Cr10 twinning-induced plasticity (TWIP) HEA, the carbon-doped Fe47Mn31Co10Cr10C2 HEA after annealing at 1173 K for 10 min exhibited a higher strainhardening rate, and significantly improved yield strength (YS) and ultimate tensile strength (UTS), with maintaining high elongation. The remarkable improvements in YS were mainly attributed to the multiple synergistic strengthening mechanisms, including enhanced grain boundary strengthening, hetero-deformation-induced (HDI) strengthening, and Cr23C6 precipitation strengthening. The higher strain-hardening rate could be ascribed to the enhanced TWIP effect and HDI strain-hardening. The effective stacking fault energy (SFE) of the Fe40Mn40Co10Cr10 and Fe47Mn31Co10Cr10C2 HEAs were calculated by thermodynamics to be 23.4 mJ/m2 and 22.1 mJ/m2, respectively. This revealed that reducing the Mn content effectively counteracted the increasing effect of carbon on the SFE for the carbon-doped HEA. The promotion of deformation twinning in the Fe47Mn31Co10Cr10C2 HEA could be ascribed to the comprehensive effect of the SFE and the stress levels of the alloys. On one hand, compared with the Fe40Mn40Co10Cr10 TWIP HEA, the lower SFE in the Fe47Mn31Co10Cr10C2 HEA led to a drop in the critical stress for deformation twinning. On the other hand, due to the strong multiple synergistic strengthening with carbon doping, the stress levels of the alloys were significantly enhanced, thus making the activation stress of twinning much easier to achieve. This study contributes to the alloy design guidance of properly utilizing carbon to achieve high strength-ductility synergy in alloys by multiple synergistic strategies.

引用

页数：13

共 75 条

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