Experimental isothermal section at 1200 °C of V–Cr–Si system

• Isothermal section at 1200°C of the V–Cr–Si phase diagram are determined.
• Continuous solution phases (Cr,V)3Si, (Cr,V)5Si3 and (Cr,V)Si2 were confirmed.
• The solubility of Cr in V6Si5 and of V in CrSi have been determined.
• A ternary phase (Cr,V)11Si8 was observed.
• Homogeneity range of (Cr,V)11Si8 is at constant Si ratio and was determined.

In the present work, the isothermal section at 1200 °C of the V–Cr–Si phase diagram was experimentally studied. The samples were prepared by arc melting and characterized using scanning electron microscopy/energy-dispersive spectroscopy and electron probe microanalyzer. The continuous solution phases (Cr,V)3Si, (Cr,V)5Si3 and (Cr,V)Si2 were confirmed. The solubilities of Cr in V6Si5 and of V in CrSi have been measured. A ternary phase (Cr,V)11Si8 was observed and its homogeneity range, which is at constant Si ratio, was determined at 1200 °C.