Investigation of the Nd-rich phases in the Nd-Fe-B system

Journal Article · Tue Nov 15 00:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.342321· OSTI ID:6747839

Tang, W; Zhou, S; Wang, R; Graham, Jr, C D

The crystal structures and the compositions of the Nd-rich phases in the Nd-Fe-B system have been investigated by means of transmission electron microscopy, x-ray diffraction, and Auger spectroscopy techniques. It has been observed that there are two kinds of Nd-rich phases with different structures and compositions. Most of the Nd-rich phases will undergo a phase transformation when the powder is sintered at high temperatures. This phase transformation is accompanied by the introduction of oxygen into the alloy which will change from a ternary system into a quaternary one. Both of the two Nd-rich phases are stable phases in this later system. With the aid of the EDX and the Auger spectroscope, the compositions of the dhcp and the fcc Nd-rich phases have been determined. The Nd contents of the two phases are about 90 and 70 at. %, respectively, with the later phase containing about 15 at. % of oxygen.

• Research Organization: Department of Materials Science and Engineering, Beijing University of Iron and Steel Technology, Beijing, People's Republic of China
• OSTI ID: 6747839
• Journal Information: J. Appl. Phys.; (United States), Vol. 64:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
IRON ALLOYS
NEODYMIUM ALLOYS
ELECTRON MICROSCOPY
GRAIN BOUNDARIES
ORDER PARAMETERS
QUANTITATIVE CHEMICAL ANALYSIS
X-RAY DIFFRACTION
ALLOYS
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFRACTION
MICROSCOPY
MICROSTRUCTURE
RARE EARTH ALLOYS
SCATTERING
360102* - Metals & Alloys- Structure & Phase Studies