Suppression of non-oriented grains in Nd-Fe-B hot-deformed magnets by Nb doping. (1st April 2018)

• Record Type: Journal Article
• Authors: Tang, Xin; Sepehri-Amin, H.; Ohkubo, T.; Hono, K.
• Is Part Of: Scripta materialia. Number 147(2018)
• Page Start: 108
• Page End: 113
• Publication Date: 2018-04-01
• Subjects: Permanent magnet -- Nd-Fe-B -- Hot-deformed magnet -- Coercivity -- Remanence; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.12.032
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 0.2 at.%Nb doping to a Nd12.83 Fe76.7 Co4.50 Ga0.53 B5.44 alloy suppress the surface crystallization in melt-spun ribbon, thereby suppressing the formation of non-oriented grains during the hot-deformation process to form bulk anisotropic magnet, which leads to the enhancement of remanence. High resolution transmission electron microscopy and three-dimension atom probe tomography revealed that the segregation of Nb at the grain boundaries hinders the grain growth during the hot-deformation process, thereby reducing the size and the aspect ratio of Nd2 Fe14 B grains and increasing coercivity. Graphical abstract: Image 1