Texture Formation during Hot-Deformation of High-Nb Containing γ-TiAl Based Alloys

Abstract:

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In this study texture and microstructure formation in high-Nb containing TiAl alloys during lab-scale compression experiments and “near conventional” forging on an industrial scale are investigated. The deformation temperatures range from 700 °C up to temperatures close to the α transus temperature (Tα = 1295 °C). Depending on the deformation conditions, the texture of the tetragonal γ-TiAl phase is formed by pure deformation components, components related to dynamic recrystallization, or transformation components. This changing corresponds with microstructural observations. The hexagonal phases α2-Ti3Al and α-Ti(Al) show a similar texture as it is known for Ti and Ti-base alloys after compressive deformation at elevated temperatures. In contrast to the γ texture, no significant change of the α/α2 texture was observed in the investigated temperature range. In the alloy with a composition of Ti-45Al-10Nb (in at.%) even deformation textures of ternary intermetallic phases, as the hexagonal ωo-Ti4Al3Nb and the cubic βo-TiAl(Nb) phase, respectively, were measured and analyzed.

Info:

Periodical:

Solid State Phenomena (Volume 160)

Edited by:

H. Klein and R.A. Schwarzer

Pages:

301-306

DOI:

10.4028/www.scientific.net/SSP.160.301

Citation:

A. Stark et al., "Texture Formation during Hot-Deformation of High-Nb Containing γ-TiAl Based Alloys ", Solid State Phenomena, Vol. 160, pp. 301-306, 2010

Online since:

February 2010

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$35.00

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