Abstract
Conventional titanium alloy melting practice has been used to cast near-gamma titanium aluminides with variable loadings of TiB 2 particulate, ranging from 0 to 14v%. The TiB 2 additions have been shown to be effective in reducing the α 2 /γ colony sizes in ISM and VAR ingots by as much as 82.5%. The trend of decreasing colony size with increasing volume loadings is believed to be indicative of a refinement in the primary grain size formed on solidification. The precipitation of γ laths and the subsequent ordering of the α hexagonal phase on cooling causes this refined grain size to be reflected in smaller average colony sizes. (ISM=induction skull melted, VAR=vacuum are remelted)
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