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Metals 2014, 4(1), 20-27; doi:10.3390/met4010020
Article

Microstructure and Magnetic Properties of Bulk Nanocrystalline MnAl

,
 and
*
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA
* Author to whom correspondence should be addressed.
Received: 18 December 2013 / Revised: 10 January 2014 / Accepted: 17 January 2014 / Published: 22 January 2014
(This article belongs to the Special Issue Manganese-based Permanent Magnets)
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Abstract

MnAl is a promising rare-earth free permanent magnet for technological use. We have examined the effects of consolidation by back-pressure, assisted equal channel angular extrusion processing on mechanically-milled, gas-atomized Mn-46% at. Al powder. X-ray diffraction showed both that the extruded rod consisted mostly of metastable τ phase, with some of the equilibrium γ2 and β phases, and that it largely retained the as-milled nanostructure. Magnetic measurements show a coercivity of ≤4.4 kOe and a magnetization at 10 kOe of ≤40 emu/g. In addition, extrusions exhibit greater than 95% of the theoretical density. This study opens a new window in the area of bulk MnAl magnets with improved magnetic properties for technological use.
Keywords: permanent magnet; equal channel angular extrusion; mechanical milling; magnetic properties; high coercivity permanent magnet; equal channel angular extrusion; mechanical milling; magnetic properties; high coercivity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chaturvedi, A.; Yaqub, R.; Baker, I. Microstructure and Magnetic Properties of Bulk Nanocrystalline MnAl. Metals 2014, 4, 20-27.

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