Abstract
Abstract By using an appropriately oriented seed from the TiAl–Si system, the TiAl/Ti 3 Al lamellar microstructure was aligned parallel to the growth direction for ingots having compositions of Ti–47Al, Ti–43Al–3Si, and Ti–46.5Al–3Nb–0.5Si (at.%). Directional solidification was performed in a floating zone furnace at growth rates between 5 and 40 mm h −1 . In addition, some ingots were directionally solidified in 16 mm diameter ceramic crucibles. Evidence for the solidification of the β -phase can be observed for some Ti–47Al ingots grown at 40 mm h −1 and different possible growth morphologies are discussed to explain the observed microstructures. Preliminary results from room temperature tensile tests and high temperature compression tests are also presented.
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