Intermetallics with additions of Si, V, and both V and Si were prepared in ingot formed by Ar arc co-melting, and in the form of rapidly solidified ribbons by chill-block melt-spinning. Binary Ti3Al and ternary Ti3Al-Si arc-melted ingots exhibited equiaxed antiphase boundaries in the α2 (DO19) grain interiors with columnar antiphase boundaries adjacent to the grain boundaries. In the melt-spun ribbons, which underwent high cooling rates, 3 types of antiphase domain morphology (fine, columnar and coarse equiaxed antiphase domains) were observed in any single α2 grain. Addition of 15at%V to these alloys led to retention of the ordered β (B2) phase with a relatively large antiphase domain size.

Antiphase Domain Morphologies in Ti3Al-Si Alloys. A.Jazayeri-G, R.A.Buckley, H.A.Davies: Journal of Materials Science, 2003, 38[2], 331-7