Title :
Microstructure and magnetic properties of Sm-Fe-Ta based alloys
Author :
Saje, B. ; Platts, A.E. ; Kobe Besenicar, S. ; Harris, I.R. ; Kolar, D.
Author_Institution :
Iskra-Magneti, Ljubljana, Slovenia
fDate :
3/1/1994 12:00:00 AM
Abstract :
The microstructure and magnetic properties of Sm2Fe17-xTax(0⩽x⩽2) cast alloys were investigated by means of microstructural and thermomagnetic analysis. A process for obtaining the Sm2Fe17 phase nearly free of iron in the as-cast state is described. The method consists of adding 4 to 5 at% of Ta to the melt. By this addition of Ta to the basic alloy a two phase structure of the as-cast ingots consisting of Sm2Fe17 phase and Pauli paramagnetic TaFe2 hexagonal Laves phase can be obtained. Approximately 0.5 wt.% of free iron in the cast ingot with 5 at% of Ta addition was found by isothermal magnetic analysis. It was also shown that there is some solid solubility of Ta in the Sm2Fe17 phase, which results in enhancement of the Curie temperature
Keywords :
Curie temperature; crystal microstructure; ferromagnetic properties of substances; iron alloys; samarium alloys; solid solubility; tantalum alloys; Curie temperature; Pauli paramagnetic TaFe2 hexagonal Laves phase; Sm2(FeTa)17; Sm2Fe17-xTax cast alloys; Sm2Fe17 phase; Ta addition; free iron; isothermal magnetic analysis; magnetic properties; microstructure; solid solubility; thermomagnetic analysis; two phase structure; Iron; Isothermal processes; Lead; Magnetic materials; Magnetic properties; Microstructure; Paramagnetic materials; Saturation magnetization; Soft magnetic materials; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
