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Investigation of phase selection hierarchy in Mn–Al alloys
Date
2019-12-01
Author
Genc, Ayse Merve
Acar, Ozgun
Turan, Servet
Kalay, Ilkay
Savacı, Umut
Kalay, Yunus Eren
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Primarily attributed to the formation of the ferromagnetic τ-phase, near equiatomic composition of Mn–Al have recently received much attention in permanent magnet industry. Several mechanisms have been proposed in literature for the τ-phase formation but controversy still arises regarding the dominating mode. In the current work, MnAl-based alloys having different compositions in a range between Mn50.5Al49.5 and Mn57Al43 have been studied by means of in-situ high energy X-ray diffraction, differential scanning calorimetry (DSC) and magnetic measurements. Synchrotron and DSC experiments showed the dependence of the τ-MnAl on the intermediate disordered ε0-phase. Alloys having 53.4 at% or less Mn (S1, S2) followed a transformation route of εþε’→τ→βþγ2 upon annealing. Alloys having more than 53.4 at% of Mn had only ε-phase. High energy X-ray diffraction pat-terns showed that ε-phase directly transformed into stable phases in the absence of ε0-phase. It is observed that ε0not only promoted the ferromagnetic τ-phase but also stabilized it by delaying the nucleation of stable phases
Subject Keywords
Mechanical Engineering
,
Materials Chemistry
,
Mechanics of Materials
,
General Chemistry
,
Metals and Alloys
URI
https://hdl.handle.net/11511/36880
Journal
Intermetallics
DOI
https://doi.org/10.1016/j.intermet.2019.106617
Collections
Department of Metallurgical and Materials Engineering, Article
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A. M. Genc, O. Acar, S. Turan, I. Kalay, U. Savacı, and Y. E. Kalay, “Investigation of phase selection hierarchy in Mn–Al alloys,”
Intermetallics
, pp. 0–0, 2019, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/36880.