Experimental study of the liquid-solid phase equilibria of the V-Cr-Si system

In the present work, liquid-solid phase equilibria of the V-Cr-Si phase diagram were experimentally studied. The samples were prepared by arc melting and as-cast microstructures were characterized by SEM, WDS and XRD. No new ternary phase was observed. Seven primary solidification regions were identified in these alloys: (V,Cr) solid solution, M₃Si, M₅Si ₃, MSi, M₆Si₅, MSi₂ and (Si). Microstructural observations suggest two class II invariant transformations associated to the phases Liquid, M₅Si₃, MSi₂ and MSi, and Liquid, M₅Si₃, MSi₂ and M ₆Si₅, respectively. The existence of a maximum on the monovariant line between Liquid, M₅Si₃ and MSi₂ was evidenced.