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Microstructure and magnetic properties of Mn–Al–C alloy powders prepared by ball milling

Jian, Hong and Skokov, Konstantin P. and Gutfleisch, Oliver (2015):
Microstructure and magnetic properties of Mn–Al–C alloy powders prepared by ball milling.
In: Journal of Alloys and Compounds, Elsevier Science Publishing, pp. 524-528, 622, ISSN 09258388, [Online-Edition: http://dx.doi.org/10.1016/j.jallcom.2014.10.138],
[Article]

Abstract

Magnetically anisotropic Mn–Al–C powders have been prepared by ball milling the τ-phase Mn53.3Al45C1.7 alloy. Flake-shaped powders were obtained after milling for 2 h and the thickness decreased continuously with extended milling time. No sign of decomposition was observed in the as-milled state, however, magnetization decreased and coercivity increased continuously with milling time because of the defects introduced in the milling process. μ0iHc of 0.52 T was obtained in powders milled for 12 h. By annealing the as-milled powders at 773 K for 30 min, the magnetization increased significantly because of the recovered crystal structure of τ-phase. A degree of texture ranging from 17.8% to 37.1% has been obtained and the magnetically easy axis lies within the plane of the flakes. Optimized magnetic properties, with Mr of 54.8 Am2 kg−1 and μ0iHc of 0.28 T, was obtained in Mn53.3Al45C1.7 powders milled for 5 h followed by heat treatment at 773 K.

Item Type: Article
Erschienen: 2015
Creators: Jian, Hong and Skokov, Konstantin P. and Gutfleisch, Oliver
Title: Microstructure and magnetic properties of Mn–Al–C alloy powders prepared by ball milling
Language: English
Abstract:

Magnetically anisotropic Mn–Al–C powders have been prepared by ball milling the τ-phase Mn53.3Al45C1.7 alloy. Flake-shaped powders were obtained after milling for 2 h and the thickness decreased continuously with extended milling time. No sign of decomposition was observed in the as-milled state, however, magnetization decreased and coercivity increased continuously with milling time because of the defects introduced in the milling process. μ0iHc of 0.52 T was obtained in powders milled for 12 h. By annealing the as-milled powders at 773 K for 30 min, the magnetization increased significantly because of the recovered crystal structure of τ-phase. A degree of texture ranging from 17.8% to 37.1% has been obtained and the magnetically easy axis lies within the plane of the flakes. Optimized magnetic properties, with Mr of 54.8 Am2 kg−1 and μ0iHc of 0.28 T, was obtained in Mn53.3Al45C1.7 powders milled for 5 h followed by heat treatment at 773 K.

Journal or Publication Title: Journal of Alloys and Compounds
Volume: 622
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Mn–Al–C alloy, Mechanical milling, Permanent magnets
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 03 Dec 2014 11:57
Official URL: http://dx.doi.org/10.1016/j.jallcom.2014.10.138
Identification Number: doi:10.1016/j.jallcom.2014.10.138
Funders: The research leading to these results has received funding from the European Community’s Seventh Framework Programme FP7/2007-2013 under grant agreement No. 280670 ‘REFREEPERMAG’., H. J. is grateful to the China Scholarship Council for financial support. K. P. S. is thankful for the G8 project., Financial support by the German federal state of Hessen through its excellent programme LOEWE “RESPONSE” is gratefully acknowledged.
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