Oriented grain growth in rapidly quenched Nd-Fe-B ribbons

Journal Article · Fri Nov 15 04:00:00 EST 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349866· OSTI ID:5164305

Fujimoto, T; Mukai, T ^[1]

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1. R D Laboratories-I, Nippon Steel Corporation, 1618 Ida, Nakahara-ku, Kawasaki 211 (Japan)

A strong anisotropy is induced in melt-spun and hot-pressed Nd-Fe-B ribbons by a specific heat treatment such as a slow heating up to 1000 {degree}C. The present study clarifies the origin of the induced anisotropy through microstructural observations. The following grain growth of Nd{sub 2}Fe{sub 14}B grains during heating has been observed: (I) As-quenched Nd{sub 2}Fe{sub 14}B grains grow coarser at the roll side of the ribbons at around 750 {degree}C, and at the front of the coarse-grain region a Nd-rich region is formed. (II) A rapid grain growth of some of the coarse grains (excessive grain growth) occurs at an interface of the two regions at around 800 {degree}C. The grains which have their {ital c} axes parallel to the ribbon thickness direction grow at a faster rate along a band of the Nd-rich region. Such preferential grain growth in stacked ribbons results in the enhancement of magnetization in the press direction.

• OSTI ID: 5164305
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 70:10; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
CRYSTAL STRUCTURE
FABRICATION
GRAIN GROWTH
HOT PRESSING
IRON ALLOYS
IRON BASE ALLOYS
MAGNETIZATION
MATERIALS WORKING
MICROSTRUCTURE
NEODYMIUM ALLOYS
PRESSING
QUENCHING
RARE EARTH ALLOYS