Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Experimental Phase Equilibria and Isopleth Section of 8Nb-TiAl Alloys

Version 1 : Received: 24 June 2021 / Approved: 25 June 2021 / Online: 25 June 2021 (16:02:10 CEST)

How to cite: Xu, Y.; Liang, Y.; Song, L.; Hao, G.; Tian, B.; Xu, R.; Lin, J. Experimental Phase Equilibria and Isopleth Section of 8Nb-TiAl Alloys. Preprints 2021, 2021060628 (doi: 10.20944/preprints202106.0628.v1). Xu, Y.; Liang, Y.; Song, L.; Hao, G.; Tian, B.; Xu, R.; Lin, J. Experimental Phase Equilibria and Isopleth Section of 8Nb-TiAl Alloys. Preprints 2021, 2021060628 (doi: 10.20944/preprints202106.0628.v1).

Abstract

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 βo 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 βo phases are retained at the ambient temperature in the 8Nb-TiAl microstructures. The ωo phase transforms from the highly ordered βo phase, rather than from α2 or βo with 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 ωo phase from the βo phase is considered to be a further ordering process.

Subject Areas

Titanium-Aluminum-Niobium; Phase Diagram; Vertical Section; Equilibrium Relation; CALPHAD

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