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Quenching/tempering, instead of the conventional isothermal forging process, was investigated to refine the microstructure of cast TiAl-base alloys. By tempering the quenched massive-transformed structure at temperature above the α transus, a very fine near-fully lamellar microstructure with the grain size of 70-220 μm was developed in the cast Ti46A12W0.5Si alloy.
Ordered intermetallic alloys based on aluminides and silicides offer many advantages for structural use at elevated temperatures in hostile environments. Their attractive properties include excellent oxidation and corrosion resistance, light weight, and superior strength at elevated temperatures. The major concern for structural use of intermetallics was their low ductility and poor fracture resistance...
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