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Quantitative laser atom probe analyses of hydrogenation-disproportionated Nd-Fe-B powders |
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| Authors: | Sepehri-Amin H Ohkubo T Nishiuchi T Hirosawa S Hono K |
| Affiliation: | a Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan b Magnetic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan c CREST, Japan Science and Technology Agency, Japan d Magnetic Materials Research Laboratory, NEOMAX Company, Hitachi Metals Ltd., Osaka 618-0013, Japan |
| Abstract: | We report a successful atom probe tomography of hydrides in hydrogenation-disproportionated Nd-Fe-B powder using a green femtosecond laser. The atom probe specimens were prepared from one particle of powder using the focused ion beam lift-out method. The atom probe tomography taken from an α-Fe/NdH2 structure suggested that B and Ga (trace added element) were partitioned in the NdH2 phase. The hydrogen concentration of 64 at% determined from the atom probe analysis was in excellent agreement with the stoichiometry of the NdH2 phase. |
| Keywords: | Atom probe Nd-Fe-B magnets HDDR process Hydrogen |
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