Coercivities of hot-deformed magnets processed from amorphous and nanocrystalline precursors. (15th January 2017)

• Record Type: Journal Article
• Authors: Tang, Xin; Sepehri-Amin, H.; Ohkubo, T.; Hioki, K.; Hattori, A.; Hono, K.
• Is Part Of: Acta materialia. Volume 123(2017)
• Page Start: 1
• Page End: 10
• Publication Date: 2017-01-15
• Subjects: Permanent magnet -- Nd-Fe-B -- Coercivity -- Hot deformation -- Meltspinning; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.10.026
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Hot-deformed magnets have been processed from amorphous and nanocrystalline precursors and their hard magnetic properties and microstructures have been investigated in order to explore the optimum process route. The hot-deformed magnets processed from an amorphous precursor exhibited the coercivity of 1.40 T that is higher than that processed from nanocrystalline powder, ∼1.28 T. The average grain size was larger in the magnets processed from amorphous precursor. Detailed microstructure analyses by aberration corrected scanning transmission electron microscopy revealed that the Nd + Pr concentrations in the intergranular phases were higher in the hot-deformed magnet processed from the amorphous precursor, which is considered to lead to the enhanced coercivity due to a stronger pinning force against magnetic domain wall motion. Graphical abstract: Image 1