Phase and structural transformations in the alloy on the basis of the orthorhombic titanium aluminide

• Published in: Physics of metals and metallography Vol. 106; no. 4; pp. 399 - 410
• Main Authors: Popov, A. A., Illarionov, A. G., Grib, S. V., Demakov, S. L., Karabanalov, M. S., Elkina, O. A.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.10.2008; Springer Nature B.V
• Subjects: Chemistry and Materials Science; Diffusion; Materials Science; Metallic Materials; Phase Transformation; Structure; 64.70.Kb; 81.30.Hd
• ISSN: 0031-918X; 1555-6190
• DOI: 10.1134/S0031918X08100104

Phase and structural transformations in the Ti-24.3 Al-24.8 Nb-1.0 Zr-1.4 V-0.6 Mo-0.3 Si (at %) alloy that take place during heating in the temperature range of 700–1050°C have been investigated. The temperature ranges of existence of the O + β, O + β + α 2 , β + α 2 , and β phase fields have been established. A scheme of the relationships between the volume fractions of the O , β, and α 2 phases depending on the temperature of heating of the alloy have been investigated. The formation of an ordered incommensurate ω ( V ω ) phase has been revealed in the alloy during quenching from 900°C. The existence of a correlation between the hardness properties and changes in the phase composition and morphology of particles precipitating in the alloy has been shown.