Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy
This study investigates the variations in the microstructure and mechanical properties of a rolled Mg-3.0Al-0.8Zn-0.3Mn (AZ31, wt.%) alloy caused by ultrasonic nanocrystal surface modification (UNSM) treatment and subsequent annealing. The UNSM-treated material has a gradient microstructure characte...
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2024-11-01
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| author | Hyun Ji Kim Sumi Jo Auezhan Amanov Sang-Ho Han Sung Hyuk Park |
| author_facet | Hyun Ji Kim Sumi Jo Auezhan Amanov Sang-Ho Han Sung Hyuk Park |
| author_sort | Hyun Ji Kim |
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| description | This study investigates the variations in the microstructure and mechanical properties of a rolled Mg-3.0Al-0.8Zn-0.3Mn (AZ31, wt.%) alloy caused by ultrasonic nanocrystal surface modification (UNSM) treatment and subsequent annealing. The UNSM-treated material has a gradient microstructure characterized by a nanoscale grain region overlying a twinned region. The nanoscale grain region close to the surface has extremely high strain energy, while the twinned region contains abundant {10–12} twins. Severe plastic deformation near the surface due to UNSM treatment leads to the formation of ultrafine grains and an increase in dislocation density, thereby remarkably improving the hardness and strength of the material. However, the excessive dislocation density reduces the tensile ductility. During subsequent annealing, static recrystallization occurs rapidly in the nanoscale grain region, and partial grain-boundary migration and dislocation recovery occur in the twinned region. Consequently, a gradient microstructure is formed along the thickness direction in the material subjected to UNSM treatment and subsequent annealing, thereby resulting in a tensile yield strength of 172 MPa, an ultimate tensile strength of 259 MPa, and an elongation of 15.4%. Notably, these values are higher than those of the as-rolled material, which are 132 MPa, 246 MPa, and 13.4%, respectively. This demonstrates that the sequential UNSM and annealing process results in a simultaneous improvement in the strength and ductility of the material. The strengthening mechanisms and fracture behavior are comprehensively discussed in this study. |
| format | Article |
| id | doaj-art-cfc874a3f19440ca847a6c92c12f7594 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-cfc874a3f19440ca847a6c92c12f75942024-12-26T08:55:34ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013378187828Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloyHyun Ji Kim0Sumi Jo1Auezhan Amanov2Sang-Ho Han3Sung Hyuk Park4Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea; Graduate School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Republic of KoreaDepartment of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, Republic of KoreaFaculty of Engineering and Natural Sciences, Tampere University, Tampere, 33720, FinlandDepartment of Materials Analysis, Korea Institute of Materials Science, Changwon, 51508, Republic of KoreaDepartment of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea; Graduate School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea; Corresponding author. Department of Materials Science and Metallurgical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea.This study investigates the variations in the microstructure and mechanical properties of a rolled Mg-3.0Al-0.8Zn-0.3Mn (AZ31, wt.%) alloy caused by ultrasonic nanocrystal surface modification (UNSM) treatment and subsequent annealing. The UNSM-treated material has a gradient microstructure characterized by a nanoscale grain region overlying a twinned region. The nanoscale grain region close to the surface has extremely high strain energy, while the twinned region contains abundant {10–12} twins. Severe plastic deformation near the surface due to UNSM treatment leads to the formation of ultrafine grains and an increase in dislocation density, thereby remarkably improving the hardness and strength of the material. However, the excessive dislocation density reduces the tensile ductility. During subsequent annealing, static recrystallization occurs rapidly in the nanoscale grain region, and partial grain-boundary migration and dislocation recovery occur in the twinned region. Consequently, a gradient microstructure is formed along the thickness direction in the material subjected to UNSM treatment and subsequent annealing, thereby resulting in a tensile yield strength of 172 MPa, an ultimate tensile strength of 259 MPa, and an elongation of 15.4%. Notably, these values are higher than those of the as-rolled material, which are 132 MPa, 246 MPa, and 13.4%, respectively. This demonstrates that the sequential UNSM and annealing process results in a simultaneous improvement in the strength and ductility of the material. The strengthening mechanisms and fracture behavior are comprehensively discussed in this study.http://www.sciencedirect.com/science/article/pii/S2238785424026334AZ31 alloyUltrasonic nanocrystalline surface modificationAnnealingMicrostructureMechanical properties |
| spellingShingle | Hyun Ji Kim Sumi Jo Auezhan Amanov Sang-Ho Han Sung Hyuk Park Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy Journal of Materials Research and Technology AZ31 alloy Ultrasonic nanocrystalline surface modification Annealing Microstructure Mechanical properties |
| title | Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy |
| title_full | Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy |
| title_fullStr | Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy |
| title_full_unstemmed | Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy |
| title_short | Effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled AZ31 alloy |
| title_sort | effects of ultrasonic nanocrystal surface modification treatment and subsequent annealing on the microstructure and mechanical properties of rolled az31 alloy |
| topic | AZ31 alloy Ultrasonic nanocrystalline surface modification Annealing Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424026334 |
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