Title :
Phase stability of Co5Sm
Author :
Martin, D.L. ; Smeggil, J.
Author_Institution :
General Electric Company, Schenectady, N.Y.
fDate :
9/1/1974 12:00:00 AM
Abstract :
Diffusion couples formed between cobalt and samarium provide useful structures for studying the Co5Sm eutectoid decomposition. The diffusion zones consist of Co, Co17Sm2, Co5Sm, Co7Sm2, Co3Sm, and Co2Sm when formed in the 820° to 1130°C range. The absence of the Co5Sm phase in the 775° couple provides supporting evidence for the eutectoid transformation and locates the eutectoid temperature at about 800°C. Couples formed above 820°C and then heat-treated below 800°C provided information on the eutectoid transformation which does not follow the classic Fe-C pearlite reaction. The possible effects of the decomposition on properties of permanent magnets are discussed.
Keywords :
Samarium-cobalt alloys; Aging; Annealing; Cobalt; Electrons; Heating; Magnetic properties; Permanent magnets; Stability; Temperature distribution; Thermal force;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.1974.1058480
