Abstract
The knowledge of solid-liquid equilibria is necessary to optimise sintering temperature in industrial Sm 2Co 17 type magnets. A single-phase state is reported as precursor of the cellular microstructure of the Sm 2Co 17 permanent magnets. The formation of this phase at high temperature seems, for a large part, to be governed by Zr addition. In order to understand the behaviour of 2/17 type magnets, phase relationships have been investigated in the Co-rich field of the SmCoZr system. An isoplethic section with 89 at% Co has been presented already in a previous study. In the present paper, we have investigated the 1150 °C isothermal section with lower Co content. Two isoplethic sections have been constructed for temperatures between 1150 °C and the melting points of the alloys with 87 and 85 at% Co. Two four-phase equilibria have been observed. In the Co-rich range of the ternary SmCoZr system, a tentative projection of the univariant liquidus lines has been constructed.
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