About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Magnesium Technology 2026
|
| Presentation Title |
Crystallographic Transformation of Al8Mn5 intermetallic: Insights from Synchrotron X-ray Diffraction and DFT |
| Author(s) |
Yao Kong, Jieli Liao, Yiren Wang, Qinfen Gu, Guang Zeng, Jingwei Xian, Christopher M Gourlay |
| On-Site Speaker (Planned) |
Yao Kong |
| Abstract Scope |
Mg-Al based alloys often include small manganese additions to enhance corrosion resistance. Among these, Al8Mn5 is the primary Al-Mn intermetallic compound in Mg-Al-Mn and Mg-Al-Zn-Mn alloys with over 3 wt.% Al, comprising over 99 wt.% of Al-Mn IMCs after casting. Understanding the growth mechanism of Al8Mn5 is essential for controlling alloy microstructure and improving corrosion performance of Mg-Al based alloys.
This study focuses on the crystallographic transformation of γ2-Al8Mn5, which transitions from a cubic γ-brass to a rhombohedral Cr5Al8-type structure. Synchrotron X-ray diffraction, thermodynamic and first-principles calculations were used to analyze the crystal structure, atomic coordinates, and site occupancy parameters of γ-Mn5-xAl8+x phases across varying compositions and temperatures. Density Functional Theory calculations revealed the atomic mechanisms behind the rhombohedral distortion from the pseudo-cubic cell in Al8Mn5.
These findings provide critical insights into the crystallography of Al8Mn5, offering guidance for microstructural control and alloy design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |