Critical stress for twinning nucleation in CrCoNi-based medium and high entropy alloys

被引：154

作者：

Huang, He ^{[1
,2
]}

Li, Xiaoqing ^{[1
]}

Dong, Zhihua ^{[1
]}

Li, Wei ^{[1
]}

Huang, Shuo ^{[1
]}

Meng, Daqiao ^{[2
]}

Lai, Xinchun ^{[2
]}

Liu, Tianwei ^{[2
]}

Zhu, Shengfa ^{[2
]}

Vitos, Levente ^{[1
,3
,4
]}

机构：

[1] Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden

[2] Sci & Technol Surface Phys & Chem Lab, Mianyang 621900, Peoples R China

[3] Dept Phys & Astron, Div Mat Theory, SE-75120 Uppsala, Sweden

[4] Wigner Res Ctr Phys, Inst Solid State Phys & Opt, H-1525 Budapest, Hungary

来源：

ACTA MATERIALIA | 2018年 / 149卷

基金：

瑞典研究理事会; 匈牙利科学研究基金会;

关键词：

Critical resolved shear stress (CRSS); Medium and high entropy alloys (MHEAs); Twinning nucleation; Density functional theory; STACKING-FAULT ENERGIES; SOLID-SOLUTION; PLASTICITY; FAMILY; GROWTH; SLIP;

D O I：

10.1016/j.actamat.2018.02.037

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The CrCoNi-based medium and high entropy alloys (MHEAs) have drawn much attention due to their exceptional mechanical properties at cryogenic temperatures. The twinning critical resolved shear stress (CRSS) is a fundamental parameter for evaluating the strength-ductility properties of MHEAs. Here we construct and apply an extended twinning nucleation Peierls-Nabarro (P-N) model to predict the twinning CRSSes of face-centered cubic (FCC) CrCoNi-based MHEAs. The order of the twinning CRSSes of the selected alloys is CrCoNi > CrCoNiMn > CrCoNiFe > CrCoNiFeMn and the values are 291, 277, 274 and 236 MPa, respectively. These theoretical predictions agree very well with the experimental twinning CRSSes of CrCoNi and CrCoNiFeMn accounting for 260 +/- 30 and 235 +/- 10 MPa, respectively and are perfectly consistent with the strength-ductility properties including yield stress, ultimate tensile stress and uniform elongation for fracture of the FCC CrCoNi-based MHEAs obtained at cryogenic temperatures. The present method offers a first-principle quantum-mechanical tool for optimizing and designing new MHEAs with exceptional mechanical properties. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：388 / 396

页数：9

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