Phase transitions assessment on γ-TiAl by Thermo Mechanical Analysis

Phase transition temperatures of γ-TiAl alloys were successfully identified by Thermo Mechanical Analysis. The derivative curve of the displacement as a function of temperature exhibits well defined peaks at the temperatures 1100 ≤ Teu ≤ 1200 °C and 1250 ≤ Tα ≤ 1350 °C which correspond to the phase transformations (α2 + γ) ↔ α and (α + γ) ↔ α respectively. The well-known effects of Al and Nb content on transition temperatures were studied for validation.

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► Phase transition temperatures in γ-TiAl alloys were identified by TMA.
► TMA exhibit sharper well-defined peaks than DSC which made identification easier.
► Effects of Al and Nb on phase transition temperatures were highlighted.
► Static analysis could be derived by extrapolation and linear regression.