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

Collections

Department of Metallurgical and Materials Engineering, Article