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Licensed Unlicensed Requires Authentication Published by De Gruyter January 7, 2015

Preparation of MnAlC flakes by surfactant-assisted ball-milling and the effects of annealing

K. P. Su , D. L. Tao , J. Wang , D. X. Huo , Y. Q. Cao , Z. W. Liu and Y. J. Zhang


An alternative approach for preparing anisotropic MnAlC powders is reported. [001] textured MnAlC flakes with various sizes and thicknesses were fabricated by surfactant-assisted ball-milling (SABM) of bulk ingots. After ball-milling for 8 h the flakes have thicknesses below 200 nm and aspect ratios as high as 102∼103. After being annealed at suitable temperatures, both bulk and SABMed powders can transform from ∊-phase to τ-phase completely. C-doping cannot prevent the decomposition of the τ-phase into the β+γ2 phases after annealing at above 500°C. The magnetic properties are strongly dependent on both the fraction of the τ-phase and the thickness. A high coercivity of ∼242.8 kA m−1 has been achieved in SABMed powders. The coercivity value is 128.8% higher than the experimental value for bulk materials.

* Correspondence address, Dr. Kunpeng Su, Institute of Materials Physics, Hangzhou Dianzi University, Xiasha Higher Education Park, Hangzhou, 310018, P.R. China. Tel.: +86 571 86878539, Fax: +86 571 86878539, E-mail:
** Prof. Zhongwu Liu, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, P.R. China. Tel.: +86 20-22236906, Fax: +86 20-22236906, E-mail:


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Received: 2014-05-30
Accepted: 2014-09-17
Published Online: 2015-01-07
Published in Print: 2015-01-09

© 2015, Carl Hanser Verlag, München

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