Abstract
The 773 K isothermal section of the phase diagram of the Ho–Co–Fe ternary system was investigated by using X-ray diffraction technique, metallographic analysis and scanning electron microscopy with energy dispersive analysis. The isothermal section of the ternary system consists of 6 three-phase regions, 16 two-phase regions and 11 single-phase regions. Three pairs of corresponding compounds of Ho–Co and Ho–Fe systems, i.e., Ho 2Co 17 and Ho 2Fe 17, HoCo 3 and HoFe 3, HoCo 2 and HoFe 2, form a continuous series of solid solution. At 773 K the compound Ho 6Fe 23− x Co x was found to have a wide homogeneity range from 0 to 29 at.% Co. The maximum solid solubilities of Fe in Co, Ho 2Co 7, Ho 12Co 7 and Ho 3Co were determined to be about 10, 9, 2 and 5 at.% Fe, respectively. The maximum solid solubility of Co in Fe is found to be 78 at.% Co.
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