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

Microstructure and Magnetic Properties of Bulk Nanocrystalline MnAl

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Received: 18 December 2013; in revised form: 10 January 2014 / Accepted: 17 January 2014 / Published: 22 January 2014
(This article belongs to the Special Issue Manganese-based Permanent Magnets)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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
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MDPI and ACS Style

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

AMA Style

Chaturvedi A, Yaqub R, Baker I. Microstructure and Magnetic Properties of Bulk Nanocrystalline MnAl. Metals. 2014; 4(1):20-27.

Chicago/Turabian Style

Chaturvedi, Anurag; Yaqub, Rumana; Baker, Ian. 2014. "Microstructure and Magnetic Properties of Bulk Nanocrystalline MnAl." Metals 4, no. 1: 20-27.

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