Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates
The high-temperature tensile deformation behaviors of the recrystallization annealed Al7(CoNiV)93 medium entropy alloy with a duplex hierarchical microstructure of face-centered cubic (fcc) and ordered body-centered cubic L21 Heusler-type grains were investigated. The alloy showed a remarkably high...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2022-11-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0113926 |
| _version_ | 1797947404621709312 |
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| author | Raymond Kwesi Nutor Ran Wei Qingping Cao Xiaodong Wang Shaoqing Ding Dongxian Zhang Fushan Li Jian-Zhong Jiang |
| author_facet | Raymond Kwesi Nutor Ran Wei Qingping Cao Xiaodong Wang Shaoqing Ding Dongxian Zhang Fushan Li Jian-Zhong Jiang |
| author_sort | Raymond Kwesi Nutor |
| collection | DOAJ |
| description | The high-temperature tensile deformation behaviors of the recrystallization annealed Al7(CoNiV)93 medium entropy alloy with a duplex hierarchical microstructure of face-centered cubic (fcc) and ordered body-centered cubic L21 Heusler-type grains were investigated. The alloy showed a remarkably high tensile strength of ∼1.1 GPa and good ductility of ∼17% at 923 K due to a good strain hardening capacity of 60 MPa. At 1073 K, the highest fracture elongation of ∼270% was displayed at a strain rate of 10−3 s−1. The strain rate sensitivity was estimated to be about 0.32, which is typical of alloys that show this quasi-superplastic elongation. The activation energy was also estimated to be ∼421 kJ/mol. With deformation at 1073 K at a strain rate of 10−3 s−1, the duplex microstructure transformed into a refined triplex fcc-L21-σ equiaxed microstructure. The development of the triplex equiaxed microstructure resulted from dynamic recrystallization (DRX), which assisted in the maximum superplastic-like elongation of 270%. The inability of the alloy to access true superplasticity was attributed to immense cavitation due to the high amount of the brittle σ phase, which served as de-cohesion sites for the early fracture of the sample. However, the observed quasi-superplasticity could still be useful in superplastic forming operations. |
| first_indexed | 2024-04-10T21:27:13Z |
| format | Article |
| id | doaj.art-7823a47d61f04073ab2b6b24f1d418dc |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-04-10T21:27:13Z |
| publishDate | 2022-11-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-7823a47d61f04073ab2b6b24f1d418dc2023-01-19T16:28:28ZengAIP Publishing LLCAPL Materials2166-532X2022-11-011011111103111103-910.1063/5.0113926Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitatesRaymond Kwesi Nutor0Ran Wei1Qingping Cao2Xiaodong Wang3Shaoqing Ding4Dongxian Zhang5Fushan Li6Jian-Zhong Jiang7International Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of ChinaInternational Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaInternational Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaInternational Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaInternational Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaSchool of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of ChinaInternational Center for New-Structured Materials (ICNSM), State Key Laboratory of Silicon Materials, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of ChinaThe high-temperature tensile deformation behaviors of the recrystallization annealed Al7(CoNiV)93 medium entropy alloy with a duplex hierarchical microstructure of face-centered cubic (fcc) and ordered body-centered cubic L21 Heusler-type grains were investigated. The alloy showed a remarkably high tensile strength of ∼1.1 GPa and good ductility of ∼17% at 923 K due to a good strain hardening capacity of 60 MPa. At 1073 K, the highest fracture elongation of ∼270% was displayed at a strain rate of 10−3 s−1. The strain rate sensitivity was estimated to be about 0.32, which is typical of alloys that show this quasi-superplastic elongation. The activation energy was also estimated to be ∼421 kJ/mol. With deformation at 1073 K at a strain rate of 10−3 s−1, the duplex microstructure transformed into a refined triplex fcc-L21-σ equiaxed microstructure. The development of the triplex equiaxed microstructure resulted from dynamic recrystallization (DRX), which assisted in the maximum superplastic-like elongation of 270%. The inability of the alloy to access true superplasticity was attributed to immense cavitation due to the high amount of the brittle σ phase, which served as de-cohesion sites for the early fracture of the sample. However, the observed quasi-superplasticity could still be useful in superplastic forming operations.http://dx.doi.org/10.1063/5.0113926 |
| spellingShingle | Raymond Kwesi Nutor Ran Wei Qingping Cao Xiaodong Wang Shaoqing Ding Dongxian Zhang Fushan Li Jian-Zhong Jiang Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates APL Materials |
| title | Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates |
| title_full | Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates |
| title_fullStr | Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates |
| title_full_unstemmed | Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates |
| title_short | Quasi-superplasticity in the AlCoNiV medium entropy alloy with Heusler L21 precipitates |
| title_sort | quasi superplasticity in the alconiv medium entropy alloy with heusler l21 precipitates |
| url | http://dx.doi.org/10.1063/5.0113926 |
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