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 |
Direct Observation of Solute Segregations at Kink Boundaries in LPSO-type Mg Alloys |
Author(s) |
Daisuke Egusa, Koji Inoue, Yasuyoshi Nagai, Eiji Abe |
On-Site Speaker (Planned) |
Daisuke Egusa |
Abstract Scope |
Mg alloys containing long period stacking/order (LPSO) phase have gathering wide attention because of their excellent mechanical properties, which are believed to be derived from their unique deformation modes, “kinking”. In the present study, we have investigated atomic structure of kink boundary (KB) in a hot-extruded Mg-Zn-Y alloy, based on scanning transmission electron microscopy (STEM) and atom-probe tomography (APT). STEM observations show that KBs are composed of arrays of extended basal dislocations that selectively locates on solute-enriched stacking faults (SESF) in the LPSO structure. Introduction of such dislocations on SESF causes structural reconstruction, forming local hexagonal close-packed Mg region within SESF. Atomic-scale STEM/APT observations reveal that a composition of such local hcp regions becomes as dilute as that of Mg matrix in this alloy. This significant reconstruction should enhance a thermal stability of kink microstructure, which is essential for understanding mechanical properties of the Mg-Zn-Y alloys at elevated temperature. |
Proceedings Inclusion? |
Planned: At-meeting proceedings |