Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy

The development of robust alloys capable of maintaining high strength and ductility at cryogenic temperatures has been a long-sought goal, particularly for load-bearing applications in extremely low-temperature environments. In this study, we reported a newly developed face-centered-cubic (FCC) meta...

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Main Authors: Caixia Wang, Ruixing Sheng, Dawei Zhou, Weidong Li, Shuying Chen, Fanchao Meng, Gihan Velisa, Daiyi Chao, Liang Jiang, Peter K. Liaw, Yang Tong
Format: Article
Language:English
Published: Elsevier 2023-11-01
Series:Journal of Materials Research and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785423026911
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author Caixia Wang
Ruixing Sheng
Dawei Zhou
Weidong Li
Shuying Chen
Fanchao Meng
Gihan Velisa
Daiyi Chao
Liang Jiang
Peter K. Liaw
Yang Tong
author_facet Caixia Wang
Ruixing Sheng
Dawei Zhou
Weidong Li
Shuying Chen
Fanchao Meng
Gihan Velisa
Daiyi Chao
Liang Jiang
Peter K. Liaw
Yang Tong
author_sort Caixia Wang
collection DOAJ
description The development of robust alloys capable of maintaining high strength and ductility at cryogenic temperatures has been a long-sought goal, particularly for load-bearing applications in extremely low-temperature environments. In this study, we reported a newly developed face-centered-cubic (FCC) metastable (Ni0·3Co0·4Cr0.3)94Mo6 medium-entropy alloy (Mo-MEA) with an excellent synergy of strength and ductility at 77 K, surpassing the toughest equiatomic NiCoCr MEA. Compared to the equiatomic NiCoCr MEA, the Mo-MEA exhibited a substantial increase in yield strength by 68 % (from 407 to 685 MPa) and a decent enhancement of the ultimate tensile strength by 10 % (from 1289 to 1415 MPa), along with a marginal increase in elongation from 75 % to 78.45 %. Electron backscatter diffraction and transmission electron microscopy revealed the activation of multimodal deformation mechanisms, including dislocations, stacking faults, twinning, and FCC-to-hexagonal-close-packed phase transformation, during the tensile deformation at 77 K.
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spelling doaj.art-5e7fea73b9b64d0bb231b922d1fdb7482024-02-21T05:26:59ZengElsevierJournal of Materials Research and Technology2238-78542023-11-012739143922Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloyCaixia Wang0Ruixing Sheng1Dawei Zhou2Weidong Li3Shuying Chen4Fanchao Meng5Gihan Velisa6Daiyi Chao7Liang Jiang8Peter K. Liaw9Yang Tong10Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, ChinaInstitute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, ChinaBeijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Corresponding author.Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, China; Corresponding author.Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, ChinaHoria Hulubei National Institute for Physics and Nuclear Engineering, Măgurele, IF, 077125, RomaniaShandong Institutes of Industrial Technology, Yantai, Shandong, 264000, China; Corresponding author.Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, ChinaDepartment of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA; Corresponding author.Institute for Advanced Studies in Precision Materials, Yantai University, Yantai, Shandong, 264005, China; Corresponding author.The development of robust alloys capable of maintaining high strength and ductility at cryogenic temperatures has been a long-sought goal, particularly for load-bearing applications in extremely low-temperature environments. In this study, we reported a newly developed face-centered-cubic (FCC) metastable (Ni0·3Co0·4Cr0.3)94Mo6 medium-entropy alloy (Mo-MEA) with an excellent synergy of strength and ductility at 77 K, surpassing the toughest equiatomic NiCoCr MEA. Compared to the equiatomic NiCoCr MEA, the Mo-MEA exhibited a substantial increase in yield strength by 68 % (from 407 to 685 MPa) and a decent enhancement of the ultimate tensile strength by 10 % (from 1289 to 1415 MPa), along with a marginal increase in elongation from 75 % to 78.45 %. Electron backscatter diffraction and transmission electron microscopy revealed the activation of multimodal deformation mechanisms, including dislocations, stacking faults, twinning, and FCC-to-hexagonal-close-packed phase transformation, during the tensile deformation at 77 K.http://www.sciencedirect.com/science/article/pii/S2238785423026911Medium-entropy alloyCryogenic deformationTransmission electron microscopyStrength-ductility balance
spellingShingle Caixia Wang
Ruixing Sheng
Dawei Zhou
Weidong Li
Shuying Chen
Fanchao Meng
Gihan Velisa
Daiyi Chao
Liang Jiang
Peter K. Liaw
Yang Tong
Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy
Journal of Materials Research and Technology
Medium-entropy alloy
Cryogenic deformation
Transmission electron microscopy
Strength-ductility balance
title Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy
title_full Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy
title_fullStr Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy
title_full_unstemmed Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy
title_short Achieving an excellent combination of strength and ductility in a single-phase metastable medium-entropy alloy
title_sort achieving an excellent combination of strength and ductility in a single phase metastable medium entropy alloy
topic Medium-entropy alloy
Cryogenic deformation
Transmission electron microscopy
Strength-ductility balance
url http://www.sciencedirect.com/science/article/pii/S2238785423026911
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