Abstract
Abstract. The study was aimed at microstructure investigations of melt-spun rare-earth intermetallic compounds using atomic force microscopy. Surface morphology of R2Fe14B (R = Y, Nd, Gd, Er) was studied with nanometric resolution. Grain structure features were discovered depending on the rare-earth element composition and quenching regime. Grain size dependence on rare earth elements' composition decreased with the metal's serial number and atomic weight. Wherein structural size dependence on quenching wheel speed had non-linear character: increase the speed from 20 to 30 m/s led to 3 times decrease of the grain size and significant surface roughness reduction.
Highlights
Usually, modern hard magnetic materials are multi-component systems with hysteresis properties provided by precise composition selection and formation of their proper microstructure [1,2,3]
Surface morphology was investigated by atomic force microscopy using an Solver P-47H (NT-MDT, Russia) at room temperature using standard НА_NC Etalon silicon probes with 94 and 124 μm length and 140-235 kHz frequency range
The analysis of the sample's grain structure was carried out by the atomic force microscopy (AFM) method on the initial rapidly quenched samples without any special preparation. This initial state may have a significant effect on the surface morphology and complicate the analysis
Summary
Modern hard magnetic materials are multi-component systems with hysteresis properties provided by precise composition selection and formation of their proper microstructure [1,2,3]. Synthesis of permanent magnets by 3D-printing arised recently involving different methods of additive manufacturing This filed may be divided into two main branches: creating bonded magnets [5,6,7,8] and selective laser sintering/melting (SLS/SLM technologies) of powders layer by layer [9,10,11,12]. Both approaches could be combined with other technologies such as grain boundary infiltration [10,11,13].
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