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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Elsevier
2023-11-01
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Series: | Journal of Materials Research and Technology |
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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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issn | 2238-7854 |
language | English |
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publisher | Elsevier |
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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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