Study of Interfacial Reaction between TiAl Alloys and Four Ceramic Molds

With the aid of SEM and DTA, the microstructures of metal side of the interface between Ti48Al2Cr2Nb alloy and Y2O3, ZrO2 (Y2O3 stabilized), ZrO2 (MgO stabilized), and Zircon sand were investigated, respectively. The initial reaction temperatures were measured for Ti48Al2Cr2Nb alloy and Y2O3, ZrO2 (Y2O3 stabilized), ZrO2 (MgO stabilized) and Zircon sand, respectively. The results show that the microstructure is the coarsest with rosettes-like shape after Ti48Al2Cr2Nb alloy reacts with Zircon sand, and even the smallest with granular-like shape after Ti48Al2Cr2Nb alloy reacts with Y2O3. The order of the initial reaction temperatures between Ti48Al2Cr2Nb alloy and four oxide ceramic materials is non-reaction at 1500, 1400, 1380, and 820 °C, respectively.