Development of Microstructure and Crystallographic Texture during Stationary Shoulder Friction Stir Welding of Ti-6Al-4V

Author： Davies P.

Publisher： Springer Publishing Company

ISSN： 1543-1940

Source： Metallurgical and Materials Transactions A, Vol.42, Iss.8, 2011-08, pp. : 2278-2289

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Abstract

Electron backscattering diffraction (EBSD) was used to study a stationary shoulder friction stir weld in Ti-6Al-4V. Weld temperatures exceeded the β-transus, resulting in a supertransus zone (STZ) that encompassed all of the thermomechanically affected zone (TMAZ) and a portion of the heat-affected zone (HAZ). Standard EBSD provided limited information on the material behavior at high temperature in the β phase field, so in-house software was used to reconstruct the crystallographic orientations of the high-temperature β phase. The portion of the HAZ that lay within the STZ exhibited the same β texture at high temperature as the retained β phase in the unaffected parent material. In the TMAZ, material was deformed in the high-temperature β phase field and, on cooling, transformed to a fully lamellar microstructure. The β textures at high temperature were dominated by the D ₂ $$ left( {bar{1}bar{1}2} right)left[ {111} right] $$ simple shear texture component. The α phase textures in the fully lamellar microstructure that formed on cooling were inherited from the shear textures of the β phase, but significant variant selection occurred.

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