Massive transformation and the formation of the ferromagnetic L1(omicron) phase in manganese-aluminum-based alloys

Manganese-aluminum alloys in the vicinity of the equiatomic composition exhibit an attractive combination of magnetic properties for technological applications, including bulk permanent magnets and thin-film devices. In this study, modern metallographic techniques, including high-resolution electron...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2002-08, Vol.33 (8), p.2413-2423
Main Authors: Yanar, C, Wiezorek, J M K, Radmilovic, V, Soffa, W A
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Magnetism
Materials science
Online Access:Get full text
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Summary:Manganese-aluminum alloys in the vicinity of the equiatomic composition exhibit an attractive combination of magnetic properties for technological applications, including bulk permanent magnets and thin-film devices. In this study, modern metallographic techniques, including high-resolution electron microscopy (HREM), have been applied to elucidate the nature of the phase transformation and the evolution of the unique microstructure and defect structure characterizing the structural state of the ferromagnetic tau phase. It is concluded that the metastable tau phase is the product of a compositionally invariant, diffusional nucleation and growth process or massive transformation.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-002-0363-3