Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature
The tensile properties and the corresponding deformation mechanisms at both room and cryogenic temperatures for a CoCrNi-based medium entropy alloy with both a homogeneous structure and a dual heterogeneous structure have been studied and compared. The dual heterogeneous structure is found to be com...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785422002484 |
| _version_ | 1818312598989307904 |
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| author | Zihan Zhang Wei Wang Shuang Qin Muxin Yang Jing Wang Ping Jiang Fuping Yuan Xiaolei Wu |
| author_facet | Zihan Zhang Wei Wang Shuang Qin Muxin Yang Jing Wang Ping Jiang Fuping Yuan Xiaolei Wu |
| author_sort | Zihan Zhang |
| collection | DOAJ |
| description | The tensile properties and the corresponding deformation mechanisms at both room and cryogenic temperatures for a CoCrNi-based medium entropy alloy with both a homogeneous structure and a dual heterogeneous structure have been studied and compared. The dual heterogeneous structure is found to be composed of both heterogeneous grain structure and coherent L12 nanoprecipitates. Both the homogeneous structure and the dual heterogeneous structure show a simultaneous improvement on yield strength and uniform elongation at cryogenic temperature as compared to those at room temperature, which can be attributed to higher hetero-deformation-induced hardening rate and higher density of geometrically necessary dislocations induced at cryogenic temperature. For the homogeneous structure, nano-spaced stacking faults along two slip systems with much smaller interspacing and higher density of Lomer-Cottrell locks should play the essential role in sustaining the strain hardening for better tensile ductility at cryogenic temperature. L12 nanoprecipitates are observed to be very effective on blocking dislocation slip and accumulation of dislocations around them. For the dual heterogeneous structure, more intense interactions between defects and L12 nanoprecipitates are observed after tensile deformation at cryogenic temperature, resulting in fragmentation and refinement of L12 nanoprecipitates for better tensile properties than at room temperature. |
| first_indexed | 2024-12-13T08:20:24Z |
| format | Article |
| id | doaj.art-9fb77187ebec43708be08f78b15e0b41 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-13T08:20:24Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-9fb77187ebec43708be08f78b15e0b412022-12-21T23:54:02ZengElsevierJournal of Materials Research and Technology2238-78542022-03-011732623276Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperatureZihan Zhang0Wei Wang1Shuang Qin2Muxin Yang3Jing Wang4Ping Jiang5Fuping Yuan6Xiaolei Wu7State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, China; School of Engineering Science, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, ChinaState Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, China; School of Engineering Science, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, China; Corresponding author.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, No.15, West Road, North 4th Ring, Beijing 100190, China; School of Engineering Science, University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing 100049, ChinaThe tensile properties and the corresponding deformation mechanisms at both room and cryogenic temperatures for a CoCrNi-based medium entropy alloy with both a homogeneous structure and a dual heterogeneous structure have been studied and compared. The dual heterogeneous structure is found to be composed of both heterogeneous grain structure and coherent L12 nanoprecipitates. Both the homogeneous structure and the dual heterogeneous structure show a simultaneous improvement on yield strength and uniform elongation at cryogenic temperature as compared to those at room temperature, which can be attributed to higher hetero-deformation-induced hardening rate and higher density of geometrically necessary dislocations induced at cryogenic temperature. For the homogeneous structure, nano-spaced stacking faults along two slip systems with much smaller interspacing and higher density of Lomer-Cottrell locks should play the essential role in sustaining the strain hardening for better tensile ductility at cryogenic temperature. L12 nanoprecipitates are observed to be very effective on blocking dislocation slip and accumulation of dislocations around them. For the dual heterogeneous structure, more intense interactions between defects and L12 nanoprecipitates are observed after tensile deformation at cryogenic temperature, resulting in fragmentation and refinement of L12 nanoprecipitates for better tensile properties than at room temperature.http://www.sciencedirect.com/science/article/pii/S2238785422002484High entropy alloysDual heterogeneous structuresPrecipitatesStrain hardeningCryogenic properties |
| spellingShingle | Zihan Zhang Wei Wang Shuang Qin Muxin Yang Jing Wang Ping Jiang Fuping Yuan Xiaolei Wu Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature Journal of Materials Research and Technology High entropy alloys Dual heterogeneous structures Precipitates Strain hardening Cryogenic properties |
| title | Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature |
| title_full | Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature |
| title_fullStr | Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature |
| title_full_unstemmed | Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature |
| title_short | Dual heterogeneous structured medium-entropy alloys showing a superior strength-ductility synergy at cryogenic temperature |
| title_sort | dual heterogeneous structured medium entropy alloys showing a superior strength ductility synergy at cryogenic temperature |
| topic | High entropy alloys Dual heterogeneous structures Precipitates Strain hardening Cryogenic properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785422002484 |
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