Isothermal section of the Y–Co–V ternary system at 500 °C

The isothermal section of the Y–Co–V system at 500 °C has been investigated by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. Only one ternary compound YVxCo12−x with a homogeneity range of 1.30 ≤ x ≤3.64 was found in this system. The maximum solid solubilities of V in Y2Co17, Y2Co7, YCo3, YCo2 and Y3Co are about 10.0, 1.0, 3.0, 4.0 and 4.0 at.% V, respectively. The compounds VCo and VCo3 have a homogeneity range of 46–66 at.% V and 22–30 at.% V, respectively. The maximum solid solubility of Y in VCo is about 2.0 at.% Y.

Research highlights▶ The isothermal section of the Y–Co–V system at 500 °C has been established. ▶ Only one ternary compound YVxCo12−x was found in this system and it exhibits a linear homogeneity range for 1.30 ≤ x ≤ 3.64. ▶ The maximum solid solubilities of V in the compounds Y2Co17, Y2Co7, YCo3, YCo2 and Y3Co are about 10, 1.0, 3.0, 4.0 and 4.0 at.%, respectively.