BaZrO3 refractory applied to the directional solidification of TiAl alloys

4th International Conference on Advances in Solidification Processes

材料科学;物理学

He, J.^1 ; Wei, C.^1 ; Wang, S.^1 ; Meng, D.^1 ; Lu, X.^1,2 ; Wang, H.^1,2 ; Li, C.^1,2

Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, Shanghai University, Shanghai

200072, China^1

Shanghai Special Casting Engineering Technology Research Center, Shanghai

201605, China^2

关键词: Chemical compositions;    Coated moulds;    Element diffusion;    Energy dispersive spectroscopies (EDS);    Interfacial interaction;    Shell mould;    Thermal shock resistance;    Ti-al intermetallics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012033/pdf
DOI  :  10.1088/1757-899X/117/1/012033

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Recently, much attention has been paid to the refractory used for the directional solidification process of TiAl intermetallics, the Y2O3crucible/Y2O3coated moulds seem to be the suitable candidate. However, the use of Y2O3is limited by its low thermal shock resistance and high cost. In this work, a novel BaZrO3refractory was introduced to the directional solidification of TiAl intermetallics. The melt of this alloy contained in BaZrO3crucibles were heated for 30 minutes at 1600, 1650, 1700 °C, respectively, then cooled within the crucible for the investigation of the interface between the melt and the refractory. The scanning electron microscopy (SEM) was used to evaluate the surface topography and microstructure of the samples, and the energy dispersive spectroscopy (EDS) was used to analyse the chemical composition of the samples. The results indicated that no interfacial interaction layer and no obvious element diffusion were observed between the crucible and the metal, which may imply that the BaZrO3is a promising candidate of refractory for the directional solidification of TiAl alloys. This work can provide a basis for the further study of directional solidification of TiAl alloys by using BaZrO3shell mould.