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Vol.37, No.12, 1502 ~ 1509, 1999

Title

Texture Development Studies in Hot Deformed γ-TiAl

유원형Won Hyung Yoo

Abstract

Texture development by hot deformation in a Mo containing γ-TiAl alloy was studied in order to determine whether the plastic anisotropy by texture affects tensile ductility at room temperature or not. Isothermal forging and hot rolling were performed in different deformation conditions. In addition, heat treatment after high temperature deformation was performed in order to investigate the texture evolution through microstructure control. Textures of the deformed and heat treated specimens were measured and analyzed in terms of orientation distribution functions(ODFs). It was found that texture formation was closely related to dynamic recrystallization(DRX) during high temperature deformation. As far as the texture developed by isothermal forging was concerned, strong {302} ⊥ ND was found to form after deformation and maintain after the heat treatment for the duplex microstructure. However, random texture was measured after the heat treatment for the fully lamellar microstructure. Tensile elongation at room temperature showed a strong anisotropy with orientations and improved tensile elongation was obtained from Ti-48.5 at. %Al-1.5 at. %Mo alloys. These results indicated that the plastic anisotropy by texture could be used for improving the room temperature tensile property of γ-TiAl alloys.

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