Strain measurements from Nd2Fe14B grains in sintered magnets using artificial moiré fringes

Y. Murakami, T. T. Sasaki, T. Ohkubo, K. Hono

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Strain maps for Nd2Fe14B grains in Nd-Fe-B sintered magnets, representing elongation/contraction in the spacing of c planes, have been revealed by analyzing artificial moiré fringes in scanning transmission electron microscopy images. The strain maps were collected from several types of Nd2Fe14B grains in contact with metallic-Nd (m-Nd), Nd2O3, NdOx, and thin grain boundary phases. A maximum value of strain of ∼1.2% was observed at a Nd2Fe14B/m-Nd interface. The magnitude of strain for the interfaces with Nd2O3 and NdOx phases was 0.4-0.5%. The strain was negligible in the vicinity of the grain boundary phase. It appears that the observations are smaller than the theoretical values of strain that may cause a significant change in the magnetocrystalline anisotropy of the Nd2Fe14B phase.

Original languageEnglish
Pages (from-to)101-106
Number of pages6
JournalActa Materialia
Volume101
DOIs
Publication statusPublished - Dec 1 2015

All Science Journal Classification (ASJC) codes

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

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