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An extended unified microsegregation model with solid back diffusion effects and five different dendrite morphologies was used to investigate the solidification path of Al-4.37Cu-27.02Mg (wt.%) ternary eutectic alloy at different cooling rates and solid back diffusion coefficients, coupled with Thermo-Calc. It was indicated that the cooling rates ( R f  ) had no obvious effect on the solidification path which was (L + α) → (L + α + T) → (L + α + β + T); but the solid back diffusion coefficient (Φ) had a great effect on the solidification path, which evolved gradually from (L + α) → (L + α + T) → (L + α + β + T) into (L + α) → (L + α + T) when Φ increased from 0 to 1. The volume fractions of primary α phase ( V  α ), binary eutectic ( V  2E ) and ternary eutectic ( V  3E ) at each solidification path were calculated. It was shown that  V  2E  decreased with the increase of  R f   whereas  V  3E  increased and  V  α  was almost invariant. The dependence of  V  2E ,  V  3E  and  R f   were determined by linear regression analysis given as:  V  2E  = −2.5lg R f   + 47.5;  V  3E  = 6.4lg R f  +  47. Increase in Φ lead to increases in  V  α  and  V  2E  and decrease in  V  3E . The predicted soldification paths and volume fractions of Al-4.37Cu-27.02Mg ternary eutectic alloy at different cooling rates were in good agreement with experimental results.

Prediction of the solidification path of Al-4.37Cu-27.02Mg ternary eutectic alloy with a unified microsegregation model coupled with Thermo-Calc