Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature

The synthesis of lightweight yet strong-ductile materials has been an imperative challenge in alloy design. In this study, the CoCrNi-based medium-entropy alloys (MEAs) with added Al and Si were manufactured by vacuum arc melting furnace subsequently followed by cool rolling and anneal process. The...

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Main Authors: Xiao-Hua Gu, Yu-Quan Meng, Hui Chang, Tian-Xiang Bai, Sheng-Guo Ma, Yong-Qiang Zhang, Wei-Dong Song, Zhi-Qiang Li
Format: Article
Language:English
Published: MDPI AG 2021-12-01
Series:Materials
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Online Access:https://www.mdpi.com/1996-1944/14/24/7574
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author Xiao-Hua Gu
Yu-Quan Meng
Hui Chang
Tian-Xiang Bai
Sheng-Guo Ma
Yong-Qiang Zhang
Wei-Dong Song
Zhi-Qiang Li
author_facet Xiao-Hua Gu
Yu-Quan Meng
Hui Chang
Tian-Xiang Bai
Sheng-Guo Ma
Yong-Qiang Zhang
Wei-Dong Song
Zhi-Qiang Li
author_sort Xiao-Hua Gu
collection DOAJ
description The synthesis of lightweight yet strong-ductile materials has been an imperative challenge in alloy design. In this study, the CoCrNi-based medium-entropy alloys (MEAs) with added Al and Si were manufactured by vacuum arc melting furnace subsequently followed by cool rolling and anneal process. The mechanical responses of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> MEAs under quasi-static (1 × 10<sup>−3</sup> s<sup>−1</sup>) tensile strength showed that MEAs had an outstanding balance of yield strength, ultimate tensile strength, and elongation. The yield strength, ultimate tensile strength, and elongation were increased from 480 MPa, 900 MPa, and 58% at 298 K to 700 MPa, 1250 MPa, and 72% at 77 K, respectively. Temperature dependencies of the yield strength and strain hardening were investigated to understand the excellent mechanical performance, considering the contribution of lattice distortions, deformation twins, and microbands. Severe lattice distortions were determined to play a predominant role in the temperature-dependent yield stress. The Peierls barrier height increased with decreasing temperature, owing to thermal vibrations causing the effective width of a dislocation core to decrease. Through the thermodynamic formula, the stacking fault energies were calculated to be 14.12 mJ/m<sup>2</sup> and 8.32 mJ/m<sup>2</sup> at 298 K and 77 K, respectively. In conclusion, the enhanced strength and ductility at cryogenic temperature can be attributed to multiple deformation mechanisms including dislocations, extensive deformation twins, and microbands. The synergistic effect of multiple deformation mechanisms lead to the outstanding mechanical properties of the alloy at room and cryogenic temperature.
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spelling doaj.art-863d9e38d0f4464a913a90b928dd22042023-11-23T09:19:48ZengMDPI AGMaterials1996-19442021-12-011424757410.3390/ma14247574Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic TemperatureXiao-Hua Gu0Yu-Quan Meng1Hui Chang2Tian-Xiang Bai3Sheng-Guo Ma4Yong-Qiang Zhang5Wei-Dong Song6Zhi-Qiang Li7Center of Manufacture and Testing, AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, ChinaInstitute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaInstitute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaInstitute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaInstitute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCenter of Manufacture and Testing, AECC Commercial Aircraft Engine Co., Ltd., Shanghai 200241, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaInstitute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaThe synthesis of lightweight yet strong-ductile materials has been an imperative challenge in alloy design. In this study, the CoCrNi-based medium-entropy alloys (MEAs) with added Al and Si were manufactured by vacuum arc melting furnace subsequently followed by cool rolling and anneal process. The mechanical responses of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> MEAs under quasi-static (1 × 10<sup>−3</sup> s<sup>−1</sup>) tensile strength showed that MEAs had an outstanding balance of yield strength, ultimate tensile strength, and elongation. The yield strength, ultimate tensile strength, and elongation were increased from 480 MPa, 900 MPa, and 58% at 298 K to 700 MPa, 1250 MPa, and 72% at 77 K, respectively. Temperature dependencies of the yield strength and strain hardening were investigated to understand the excellent mechanical performance, considering the contribution of lattice distortions, deformation twins, and microbands. Severe lattice distortions were determined to play a predominant role in the temperature-dependent yield stress. The Peierls barrier height increased with decreasing temperature, owing to thermal vibrations causing the effective width of a dislocation core to decrease. Through the thermodynamic formula, the stacking fault energies were calculated to be 14.12 mJ/m<sup>2</sup> and 8.32 mJ/m<sup>2</sup> at 298 K and 77 K, respectively. In conclusion, the enhanced strength and ductility at cryogenic temperature can be attributed to multiple deformation mechanisms including dislocations, extensive deformation twins, and microbands. The synergistic effect of multiple deformation mechanisms lead to the outstanding mechanical properties of the alloy at room and cryogenic temperature.https://www.mdpi.com/1996-1944/14/24/7574CoCrNi-based medium-entropy alloysmechanical propertiescryogenic temperaturedeformation mechanismsmicroband
spellingShingle Xiao-Hua Gu
Yu-Quan Meng
Hui Chang
Tian-Xiang Bai
Sheng-Guo Ma
Yong-Qiang Zhang
Wei-Dong Song
Zhi-Qiang Li
Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature
Materials
CoCrNi-based medium-entropy alloys
mechanical properties
cryogenic temperature
deformation mechanisms
microband
title Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature
title_full Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature
title_fullStr Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature
title_full_unstemmed Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature
title_short Enhanced Strength and Plasticity of CoCrNiAl<sub>0.1</sub>Si<sub>0.1</sub> Medium Entropy Alloy via Deformation Twinning and Microband at Cryogenic Temperature
title_sort enhanced strength and plasticity of cocrnial sub 0 1 sub si sub 0 1 sub medium entropy alloy via deformation twinning and microband at cryogenic temperature
topic CoCrNi-based medium-entropy alloys
mechanical properties
cryogenic temperature
deformation mechanisms
microband
url https://www.mdpi.com/1996-1944/14/24/7574
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