Title :
Phase transformation at high temperature and coercivity of Sm(Co,Cu,Fe,Zr)7-9 magnet alloys
Author :
Mori, Y. ; Umeda, T. ; Kimura, Y.
Author_Institution :
University of Tokyo, Tokyo, Japan
fDate :
9/1/1987 12:00:00 AM
Abstract :
The phase diagram near compositions of magnet alloys, that is, Sm-Co-13.0at%Cu-10.0at%Fe, Sm-Co-7.0at%Cu-22.0at%Fe and Sm-Co-7.0at%Cu-22.0at%Fe-2.0 at%Zr sections of the phase diagram were determined in the Sm content range from 6 to 16 at%. Furthermore, relationships between phase transformation at high temperature and coercivity were investigated. The Sm2(Co,Cu,Fe,Zr)17(Zr=0 and 2.0at%) intermetallic compound (2/17 phase) has the hexagonal TbCu7, hexagonal Th2Ni17or rhombohedral Th2Zn17structure depending on the quantity of Cu, Fe and Zr, and temperature. The alloys quenched after homogenizing treatment, by which the 2/17 phase with TbCu7structure is obtained, can possess high coercivity after the aging treatment.
Keywords :
Magnetic thermal factors; Permanent magnet materials; Aging; Coercive force; Intermetallic; Iron; Magnetic properties; Manufacturing; Permanent magnets; Samarium alloys; Temperature dependence; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1987.1065423
