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

Journal Article · Mon Nov 14 23:00:00 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), Journal Name: J. Appl. Phys.; (United States) Vol. 64:10; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

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