Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder

H. Sepehri-Amin, W. F. Li, T. Ohkubo, T. Nishiuchi, S. Hirosawa, K. Hono

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Microstructural evolution of hydrogenation-disproportionation-desorption-recombination processed Nd12.5Fe72.8Co8.0B6.5Ga0.2 powder has been investigated in relation to coercivity development during the desorption recombination process. Coercivity increases when residual NdH2 is completely dehydrogenated and the decomposed Nd is segregated at the grain boundaries of the Nd2Fe14B phase. Three-dimensional atom probe (3DAP) analysis indicates the segregation of Ga at the grain boundary. The reason for the enhancement of the coercivity by the trace addition Ga is discussed based on the 3DAP results.

Original languageEnglish
Pages (from-to)1309-1316
Number of pages8
JournalActa Materialia
Volume58
Issue number4
DOIs
Publication statusPublished - 2010 Feb
Externally publishedYes

Keywords

  • Atom probe tomography
  • Coercivity
  • HDDR
  • Nd-Fe-B
  • Permanent magnets

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Effect of Ga addition on the microstructure and magnetic properties of hydrogenation-disproportionation-desorption-recombination processed Nd-Fe-B powder'. Together they form a unique fingerprint.

Cite this