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A technique for determination of [gamma]/[gamma] interface relationships in a ([alpha]2 + [gamma]) TiAl base alloy using TEM Kikuchi patterns

Dey, S. R. and Morawiec, A and Bouzy, E and Hazotte, A. and Fundenberger, J. J. (2006) A technique for determination of [gamma]/[gamma] interface relationships in a ([alpha]2 + [gamma]) TiAl base alloy using TEM Kikuchi patterns. Materials Letters, 60 (5). 646 - 650.

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Official URL: http://www.sciencedirect.com/science/article/B6TX9...

Abstract

This work focuses on the mechanisms of microstructure and crystallographic texture evolution during gamma-massive transformation and subsequent tempering treatments, in the case of the Ti–48Al–2Nb–2Cr (at%) TiAl-based alloy. A complete massive structure is obtained by ice-water quenching. The temperature range for the destabilization of this massive structure is estimated from DSC measurement. Then, tempering is performed in both α2–γ and α–γ phase fields. Microstructure evolution is studied by transmission and scanning electron microscopy observation of samples from different stages of the heat treatments. Isotropic samples resulting from a powder-metallurgy route are used for this purpose. Then, working on the samples from investment casting, the reduction of solidification texture through massive then tempering treatments is analyzed at the light of the mechanisms of microstructure evolution identified previously.

Item Type:Article
Uncontrolled Keywords:A. Titanium aluminides, based on TiAl; B. Texture; D. Microstructure
Subjects:Material Science > Nanostructured materials
ID Code:6817
Deposited By:SPI
Deposited On:06 Feb 2010 11:46
Last Modified:06 Feb 2010 11:46

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