Metals · 2014 · 56 citations · 21 references
Natural SciencesMaterials EngineeringMaterials ScienceMagnetic MaterialsMetallurgyNanotechnologyMagnetic NanomaterialsMagnetic Properties Of SolidsMagnetism In SolidsMagnetization ProcessesPermanent MagnetsPowder MetallurgyMagnetic PropertiesMetastable Phase BehaviorMetastable Phase TransformationsNanocrystalline Magnetic MaterialsNanocrystalline MagnetsRare-earth Permanent MagnetsRare-earth-free Permanent MagnetsX-ray Diffraction Analysis
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.
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New material for permanent magnets on a base of Nd and Fe (invited)
M. Sagawa, S. Fujimura, N. Togawa et al. · Journal of Applied Physics · 1984 · 2.9K citations
Natural Sciences, Materials Engineering, Materials Science +17
Materials processing by simple shear
V. M. Segal · Materials Science and Engineering A · 1995 · 2.1K citations