A Thermodynamic Description of the Al-Cr-Si System

The Al-Cr-Si system was critically assessed using the CALPHAD technique. The solution phases (liquid, bcc, fcc, and diamond) were described by a substitutional solution model. The compounds CrSi2, Cr3Si, AlCr2, αAl8Cr5, βAl8Cr5, Al4Cr, and Al11Cr2 in the Al-Cr-Si system were treated with sublattice models (Cr, Si)(Al, Cr, Si)2, (Cr, Si)3(Al, Cr, Si), (Al, Cr, Si)(Al, Cr)2, α(Al, Cr, Si)8(Al, Cr, Si)5, β(Al, Cr, Si)8(Al, Cr, Si)5, (Al, Si)4(Al, Cr), and (Al, Si)11(Al, Cr)2, respectively. The ternary intermetallic compounds τ1, τ2, and τ3 were treated as the formulae Al13Cr4Si4, Al9Cr3Si, and (Al,Si)11Cr4, respectively. A set of self-consistent thermodynamic description of the Al-Cr-Si system was obtained.