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Erschienen in: Metallurgical and Materials Transactions A 3/2011

01.03.2011 | Symposium: Structural Transitions and Local Deformation Processes at and near Grain Boundaries

Grain Boundary Mediated Displacive–Diffusional Formation of τ-Phase MnAl

verfasst von: Jorg M. K. Wiezorek, Andreas K. Kulovits, Cagatay Yanar, William A. Soffa

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 3/2011

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Abstract

Dynamic in situ heating and postmortem transmission electron microscopy studies, including high-resolution electron microscopy, have been performed for a near equiatomic composition of a Mn-Al-base permanent magnet alloy to investigate the mechanisms of the transformation of hexagonal close-packed ε-phase to a chemically ordered tetragonal τ-phase with a face-centered cubic-related L10 structure. Although a “massive” mode dominates the kinetics of this composition invariant transformation, we also observed the genesis of a morphologically plate-like τ-phase by partial dislocation glide, described as Shockley-type partials with respect to the L10 structure, and a transformation mode exhibiting displacive characteristics. The sources for the transformation dislocations facilitating the formation of the morphologically plate-like τ-phase were associated with the interfaces between the parent ε- and product τ-phase produced by the “massive” transformation mode. Our experiments revealed diffusional and displacive features of the mechanism accomplishing the formation of τ-MnAl with plate-like morphology. Hence, a hybrid displacive–diffusional mechanism has been identified, and the synergistic role of the nucleation interfaces of the massively transformed τ-phase has been discussed.

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Metadaten
Titel
Grain Boundary Mediated Displacive–Diffusional Formation of τ-Phase MnAl
verfasst von
Jorg M. K. Wiezorek
Andreas K. Kulovits
Cagatay Yanar
William A. Soffa
Publikationsdatum
01.03.2011
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 3/2011
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-010-0308-1

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