| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2024
|
| Presentation Title |
Microstructural Evolution Near Microcrack in AZ31 Mg Alloy Under Electropulses |
| Author(s) |
Jinyeong Yu, Seong Ho Lee, Seho Cheon, Mooseong Mun, Jeong Hun Lee, Taekyung Lee |
| On-Site Speaker (Planned) |
Jinyeong Yu |
| Abstract Scope |
Electropulsing treatment (EPT) is a novel method utilizing the Joule effect for efficient metal heating. EPT's advantages over traditional furnace methods have led to growing interest, particularly its defect-repair potential at sub-melting temperatures. Our study introduces an alternative EPT process using direct current (DC) for reduced energy consumption and enhanced scalability. The research involves applying square wave pulses with varying current densities to AZ31 magnesium, examining microstructural changes in pre-cracked sheets under EPT. Subsequent fatigue tests induce controlled pre-cracks, revealing localized welding around the cracks post-EPT. The study diverges by proposing a "current detour effect" and a point-wise current source amplifying the Joule effect for defect repair. Observed {10−12} extension twins support the hypothesis, attributed to the compressive stress from EPT. However, calculated thermal compressive stress remains below the CRSS for the {10−12} twin. Distinct recrystallization kinetics, such as continuous static recrystallization, might be influential around the entire crack regions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnesium, |