| 要約: | The 8Nb isopleth section of a Ti-Al-Nb system is experimentally determined based on thermal analysis and thermodynamic calculation methods to obtain the phase transformation and equilibrium relations required for material design and fabrication. The phase transus and relations for the 8Nb-TiAl system show some deviations from the calculated thermodynamic results. The ordered β<sub>o</sub> phase transforms from the disordered β/α phases at 1200–1400 °C over a large Al concentration range, and this transformation is considered to be an intermediate type between the first- and second-order phase transitions. Moreover, the β<sub>o</sub> phases are retained at the ambient temperature in the 8Nb-TiAl microstructures. The ω<sub>o</sub> phase transforms from the highly ordered β<sub>o</sub> phase, rather than from α<sub>2</sub> or β<sub>o</sub> with a low degree of atom ordering B2 (LOB2) structure, with Al concentration of 32–43 at% at approximately 850 °C. From the experimental detection, the transition of the ω<sub>o</sub> phase from the β<sub>o</sub> phase is considered to be a further ordering process.
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