Abstract
The plate-like modification of the τ-MnAl-C (L10-structure) is a promising material for magnetoplastic applications. The formation of the metastable plate-like τ from the supercooled high- temperature ε-phase (A3-structure) is a discontinuous displacive process. It thus becomes possible to control the appearance of particular variants of the twin-related structural domains of τ at the intermediate stages of the ε → τ transformation. The displacive mechanism of the plate- like τ-formation was studied by transmission electron microscopy. The intermediate ε′-phase (B19-structure) forms from the ε-phase and transmits the crystallographic correspondence from the matrix ε to the plate-like τ. The structural domain boundaries of the intermediate ε′-phase are the nucleation sites of the plate-like τ. The crucial role of these structural domain boundaries for the formation of the plate-like τ-phase is demonstrated.
Original language | English |
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Pages (from-to) | 863-867 |
Number of pages | 5 |
Journal | Archives of Metallurgy and Materials |
Volume | 49 |
Issue number | 4 |
State | Published - 2004 |
Keywords
- Displacive transformation
- MnAl-C alloys
- Nucleation sites
- Structural domains