Abstract
Phase equilibria among β-Ti, α2-Ti3Al, and γ-TiAl phases was examined experimentally in order to reveal the effect of interstitial carbon and oxygen in Ti–Al–M (M:β stabilizing elements) ternary systems. In both Ti–Al–V and Ti–Al–Cr ternary systems, interstitial elements partition into the α2 against γ and β phases. By adding interstitials into the ternary alloys, the β + α2 + γ three-phase coexisting region shift towards the higher M content side. At the same time, the terminal composition of the β phase increases with increasing interstitial content in the alloy, especially in case of oxygen. Detailed difference between the effect of carbon and oxygen will be discussed.
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