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Transformation kinetics of the ferromagnetic alloy Mn-Al-C

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2 Author(s)
W. Dreizler ; Brown-Boveri Research Center, Baden/Dättwill, Switzerland. ; A. Menth

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.

Published in:

IEEE Transactions on Magnetics  (Volume:16 ,  Issue: 3 )