Mold Wall Reactions in the Directional Solidication of Gamma TiAl Alloys

This project will utilize the modified-Bridgeman technique of crystal growth for the high temperature processing of gamma TiAl alloys. It will develop and test eight distinct mold materials for their performance and product integrity. Attention will focus on the relationship between the mold wall / liquid metal interface and the quality of the cast material. The project will develop a bi-level hierarchy for testing: Level I consists of the screening of candidate mold materials and Level II continues evaluations of the top two candidates. The project will result in suggestions for application of oriented TiAl crystals for aerospace and related industries.