Abstract
Intermetallic Ti–45Al–8.5Nb–(W, B, Y) alloys were directionally solidified at constant growth rates (V) ranging from 10 to 400μm/s under the temperature gradient G=3.8×103K/m. Quenching was performed at the end of directional solidification (DS) experiments. Microstructure evolution was investigated by analyzing the microstructures formed at the quenching interfaces and in the DS regions. The primary dendritic arm spacing (λ) decreases with increasing growth rate according to the relationship λ∝V−0.36. Both the width of columnar grain (λw) and the interlamellar spacing (λs) decrease with increasing growth rate according to the relationships λw∝V−1.13 and λs∝V−0.32, respectively. Lamellar microstructure initially disappears from the dendrites at the growth rate of 100μm/s and subsequently from the interdendritic regions when the growth rate is up to 200μm/s. The B2 particles can precipitate in the interdendritic regions.
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