Phase transformation at high temperature and coercivity of Sm(Co,Cu,Fe,Zr)7-9 magnet alloys
- 1 September 1987
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Magnetics
- Vol. 23 (5) , 2702-2704
- https://doi.org/10.1109/tmag.1987.1065423
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
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