Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism
This study investigates the variations in the microstructural characteristics of a pre-twinned Mg alloy with the temperature of the subsequent annealing treatment. To this end, a rolled AZ31 alloy is compressed to 3% plastic strain along the rolling direction (RD) to activate {10-12} twinning and is...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-08-01
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| Series: | Journal of Magnesium and Alloys |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S221395672200278X |
| _version_ | 1797660331677319168 |
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| author | Ye Jin Kim Jong Un Lee Gyo Myeong Lee Sung Hyuk Park |
| author_facet | Ye Jin Kim Jong Un Lee Gyo Myeong Lee Sung Hyuk Park |
| author_sort | Ye Jin Kim |
| collection | DOAJ |
| description | This study investigates the variations in the microstructural characteristics of a pre-twinned Mg alloy with the temperature of the subsequent annealing treatment. To this end, a rolled AZ31 alloy is compressed to 3% plastic strain along the rolling direction (RD) to activate {10-12} twinning and is subsequently annealed at 200, 250, 300, 350, and 400 °C. Numerous {10-12} twins are formed throughout the compressed material, leading to the formation of a RD-oriented texture. At an annealing temperature of 200 °C, no microstructural variations occur during annealing. As the annealing temperature increases from 250 to 400 °C, the residual strain energy and remaining twin boundaries of the annealed material decrease owing to the promoted static recovery and the increased area fraction of twin-free grown grains. Consequently, an increase in the annealing temperature results in a gradual microstructural transition from a fully twinned grain structure to a completely twin-free grain structure. The microstructural evolution during annealing is predominantly governed by the movement of high-angle grain boundaries via a strain-induced boundary migration mechanism, and a few twin boundaries migrate above 350 °C because of their lower boundary energy. The boundary migration behavior and resultant microstructural evolution are discussed in detail based on the variations in boundary mobility and driving force for boundary migration with annealing temperature. |
| first_indexed | 2024-03-11T18:29:15Z |
| format | Article |
| id | doaj.art-c29e3b40817e4798b0ef4ae55dd5cb4e |
| institution | Directory Open Access Journal |
| issn | 2213-9567 |
| language | English |
| last_indexed | 2024-03-11T18:29:15Z |
| publishDate | 2023-08-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj.art-c29e3b40817e4798b0ef4ae55dd5cb4e2023-10-13T13:53:51ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672023-08-0111829532966Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanismYe Jin Kim0Jong Un Lee1Gyo Myeong Lee2Sung Hyuk Park3School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of KoreaSchool of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of KoreaSchool of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of KoreaCorresponding author.; School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of KoreaThis study investigates the variations in the microstructural characteristics of a pre-twinned Mg alloy with the temperature of the subsequent annealing treatment. To this end, a rolled AZ31 alloy is compressed to 3% plastic strain along the rolling direction (RD) to activate {10-12} twinning and is subsequently annealed at 200, 250, 300, 350, and 400 °C. Numerous {10-12} twins are formed throughout the compressed material, leading to the formation of a RD-oriented texture. At an annealing temperature of 200 °C, no microstructural variations occur during annealing. As the annealing temperature increases from 250 to 400 °C, the residual strain energy and remaining twin boundaries of the annealed material decrease owing to the promoted static recovery and the increased area fraction of twin-free grown grains. Consequently, an increase in the annealing temperature results in a gradual microstructural transition from a fully twinned grain structure to a completely twin-free grain structure. The microstructural evolution during annealing is predominantly governed by the movement of high-angle grain boundaries via a strain-induced boundary migration mechanism, and a few twin boundaries migrate above 350 °C because of their lower boundary energy. The boundary migration behavior and resultant microstructural evolution are discussed in detail based on the variations in boundary mobility and driving force for boundary migration with annealing temperature.http://www.sciencedirect.com/science/article/pii/S221395672200278XRolled Mg alloy{10-12} twinGrain growthBoundary migrationAnnealing |
| spellingShingle | Ye Jin Kim Jong Un Lee Gyo Myeong Lee Sung Hyuk Park Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism Journal of Magnesium and Alloys Rolled Mg alloy {10-12} twin Grain growth Boundary migration Annealing |
| title | Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism |
| title_full | Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism |
| title_fullStr | Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism |
| title_full_unstemmed | Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism |
| title_short | Microstructural evolution of pre-twinned Mg alloy with annealing temperature and underlying boundary migration mechanism |
| title_sort | microstructural evolution of pre twinned mg alloy with annealing temperature and underlying boundary migration mechanism |
| topic | Rolled Mg alloy {10-12} twin Grain growth Boundary migration Annealing |
| url | http://www.sciencedirect.com/science/article/pii/S221395672200278X |
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