Transformation kinetics of the ferromagnetic alloy Mn-Al-C

Author

Dreizler, Willi H. ; Menth, A.

Author_Institution

Brown-Boveri Research Center, Baden/Dättwill, Switzerland.

Volume

16

Issue

3

fYear

1980

fDate

5/1/1980 12:00:00 AM

Firstpage

534

Lastpage

536

Abstract

Mn1-x-yAlxCyforms a ferromagnetic metastable tetragonal τ-phase in the composition range $0.42 \\leq x \\leq 0.47$ and $0 \\leq y \\leq 0.021$ . Its high unaxial magnetocrystalline anisotropy makes it an interesting candidate for a permanent magnet. In order to investigate the kinetics of the transformations which occur in this system, we established the time-temperature-transformation diagram of a ternary alloy with the composition Mn0.538Al0.446C0.016. It was homogenized for 2 h at 1375 K, quenched, and subsequently isothermally annealed at temperatures between 625 K and 1025 K for various times ranging from one minute up to seven days. The quantitative phase analyses were performed by means of x-ray diffraction and stereological analysis of the microstructures. The addition of carbon increases the stability of the τ-phase, thereby allowing longer annealing times for the formation of single-phase samples.

Keywords

Permanent magnet materials; Anisotropic magnetoresistance; Annealing; Iron alloys; Kinetic theory; Magnetic anisotropy; Manganese alloys; Metastasis; Performance analysis; Permanent magnets; Perpendicular magnetic anisotropy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1980.1060641

Filename

1060641