About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
Subgrain boundary melting and grain segmentation induced by semi-solid compression in Al-Cu alloys: a synchrotron X-ray tomography study |
| Author(s) |
Ling-En Yao, Ke-Chen Huang, Hao-Chuan Huang, Kai-Yu Liang, Ying-Shuo Tseng, Yen-Fang Song, Gung-Chian Yin, Te-Cheng Su |
| On-Site Speaker (Planned) |
Ling-En Yao |
| Abstract Scope |
This study investigates grain refinement mechanisms in Al–Cu alloys induced by semi-solid compression, with a focus on deformation-induced subgrain boundary melting and grain segmentation. Al–8Cu and Al–15Cu alloys were fabricated via casting and globularization heat treatment. In-situ synchrotron X-ray tomography with controlled heating was conducted to establish the relationship between temperature and solid fraction. Ex-situ drained compression tests were performed to evaluate rheological behavior, and tomography of the deformed samples revealed fragmented grains and evidence of liquid-assisted segmentation along subgrain boundaries. Al–15Cu alloy exhibited finer grains and more effective densification. Measured solid fractions were higher than thermodynamic predictions due to the presence of isolated liquid pockets entrapped within globular αAl grains. These findings suggest that the envelope fraction provides a more accurate representation of the effective solid volume fraction during semi-solid deformation. This work elucidates the link between globular microstructure morphology and rheological response under semi-solid conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Characterization, Solidification |