DocumentCode
820829
Title
Nitrogen diffusion patterns on RE2Fe17 compounds, RE=Pr, Nd, Sm and Gd
Author
Colucci, C.C. ; Gama, S. ; Cabral, F.A.O.
Author_Institution
Inst. de Fisica Glen Wataghin, Univ. Estadual de Campinas, Brazil
Volume
28
Issue
5
fYear
1992
fDate
9/1/1992 12:00:00 AM
Firstpage
2578
Lastpage
2580
Abstract
The nitrogen diffusion patterns for several RE2Fe176 intermetallic compounds are studied. The nitriding process was done in both slabs and powder samples, which were characterized and analyzed thermomagnetically and metallographically. Thermographic analysis shows two phases: the pure 2:17 and the fully nitrided one for several nitrogen concentrations in all samples studied. Metallographic analyses confirm the presence of two phases. A broadening caused by stress or by dilution was detected for the pure phase transition. The nitriding process occurs by diffusion mechanisms: along preferential paths at low temperature and according to the shell-core model at higher temperatures
Keywords
Curie temperature; crystal microstructure; diffusion in solids; ferromagnetic properties of substances; gadolinium alloys; iron alloys; magnetic properties of fine particles; metallography; neodymium alloys; nitridation; permanent magnets; powder metallurgy; praseodymium alloys; samarium alloys; 673 K; 773 K; 873 K; Curie temperature; Gd2Fe17Nx; N2 diffusion patterns; Nd2Fe17Nx; Pr2Fe17Nx; Sm2Fe17Nx; diffusion mechanisms; intermetallic compounds; metallographic analysis microstructure; nitriding process; powder; pure phase transition; shell-core model; slabs; thermal magnetic analysis; thermographic analysis; Coils; Copper; Intermetallic; Iron; Magnetic analysis; Neodymium; Nitrogen; Powders; Samarium; Slabs;
fLanguage
English
Journal_Title
Magnetics, IEEE Transactions on
Publisher
ieee
ISSN
0018-9464
Type
jour
DOI
10.1109/20.179562
Filename
179562
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