| 摘要 |
The invention relates to novel compositions based on intermetallic alloys of rare earths and of iron which are characterised in that the said intermetallic alloys answer to the general formula Tx(Fe, M)y in which T designates at least one rare earth, preferably samarium, M at least one metallic element (additive) chosen in the group consisting of titanium, zirconium, vanadium, molybdenum, tantalum, hafnium and tungsten, and x and y are numbers lying inclusively and respectively between 1.5 and 2.5 and between 16 and 19. Preferably, the alloys of the invention further contain niobium, by way of additive. The compositions according to the invention are obtained by melting and solidification. The invention also relates to magnetic materials based on nitrided and/or carburised derivatives of the above alloys, as well as the use of the latter for preparing permanent magnets. By virtue of the presence of the above additives, the alloys, and their derivatives, of the invention, are free, or substantially free, from free iron.
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