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Intermetallic Ti–46Al–5Nb alloys were directionally solidified at constant growth rates (V) ranging from 10 to 200μm/s under the temperature gradient of G=3.8×10 3 K/m. Quenching was performed at the end of directional solidification (DS) experiments. Macrostructures and microstructures in the longitudinal section as well as the cross section have been investigated. Fully lamellar microstructures...
Using a Bridgman vertical vacuum furnace, Ti-45Al-8Nb-(W,B,Y) (at.%) bars, which were prepared from a plasma arc melting (PAM) ingot, were directionally solidified at growth rates of 10, 15, and 20 μm/s. Polysynthetic twinned (PST) crystal with an aligned lamellar microstructure was obtained at the growth rate of 15 μm/s because of high Nb addition. The principle of PST crystal growth and the effect...
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