About this Abstract |
Meeting |
12th International Conference on Magnesium Alloys and their Applications (Mg2021)
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Symposium
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12th International Conference on Magnesium Alloys and their Applications (Mg 2021)
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Presentation Title |
A HAADF STEM Study on Nucleation and Growth Crystallography of Al8Mn5 on B2-Al(Mn,Fe) Intermetallic in AZ91 Alloy |
Author(s) |
Guang Zeng, Wenhui Yang, Masaki Kudo, Kazuhiro Nogita, Syo Matsumura, Christopher M Gourlay |
On-Site Speaker (Planned) |
Guang Zeng |
Abstract Scope |
Al-Mn-Fe compounds are important for providing corrosion resistance to magnesium alloys. Many Al8Mn5 particles contained a B2-Al(Mn,Fe) particle near their centre due to Al8Mn5 nucleation on B2 followed by an incomplete peritectic transformation. However, there is uncertainty about the crystallography and the nature of the interface structure at Al8Mn5 twin boundaries and Al(Mn,Fe)-Al8Mn5 boundaries. The present study has succeeded in direct observation of B2/Al8Mn5 intermetallics by aberration-corrected scanning transmission electron microscopy (STEM), including atomic-resolution imaging as well as elemental mapping by X-ray energy-dispersive spectroscopy (XEDS). We performed chemical mapping of atomic columns along <100>cubic to explore ordering in the B2-CsCl-type structure. We confirmed that Al8Mn5 is rhombohedral with the D810-Al8Cr5 structure type and R3m space group at the atomic scale. We also imaged the B2/Al8Mn5 interface to better understand the orientation relationship and atomic coherency between B2/Al8Mn5. We observed the interface of {2-201} twin boundaries along <1-102> with distinguished atomic-resolution. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |