MICROSTRUCTURAL CONTROL THROUGH SEEDING AND DIRECTIONAL SOLIDIFICATION OF TiAl ALLOYS CONTAINING Mo AND C

摘要

Seeding of the high temperature αphase was used to control the final lamellar orientation of directionally solidified TiAl alloys. Alloys of TiAl containing small amounts(less than 1.5 at./100)of Mo and C were investigated as possible seed materials. Suitable seed compositions were determined by quickly heating specimens to a temperature just below the melting temperature, holding, and then cooling to room temperature.