Abstract: The structure hereditary dynamic processes for TiAl3 crystals in Al melt are investigated. Three structure dynamic models for different TiAl3 morphologies are built, and the surviving time of TiAl3 crystals in Al melt is analysed quantitatively. The calculation results show that the surviving time of TiA13 crystals in Al melt depends on their morphologies. Bar-like TiAl3 crystal is the most stable, round TiA3, crystal is the most unstable, and plate-like TiA3, crystal is medium. In the meantime, the surviving time of TiAl3 crystals in Al melt also depends on the original Ti concentration and the temperature of Al melt.

Key words: AlTi (B) master alloy, Structure hereditary dynamic, Surviving time of TiAl3, TiAl3 morphologies