ホーム > 研究活動 > 2015年 > Strain measurements from Nd2Fe14B grains in sintered magnets using artificial moiré fringes

研究活動

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

Acta Materialia

2015年9月29日(火)

Acta Materialia ( Volume 101, December 2015, Pages 101–106 )
http://dx.doi.org/10.1016/j.actamat.2015.08.058
Murakami,T.T. Sasakic,T. Ohkubo,Hono

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.

その他特記事項



研究活動

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合