Texture Development in Friction Stir Welds
NAVAL RESEARCH LAB WASHINGTON DC
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The shear textures that develop in friction stir welds are reviewed and discussed. In all the materials examined, including face centred cubic fcc, body centred cubic bcc and hexagonal close-packed hcp materials, friction stir welding produces a predominant shear texture with the close-packed directions aligned with the shear direction SD and the close-packed plane normal perpendicular to both the SD and the shear plane normal. This orientation corresponds to the BBB ideal shear texture in fcc materials, the D1 ideal shear texture in bcc materials, and the P1 ideal shear texture in hcp titanium alloys. Titanium friction stir welds fabricated above the Beta transus temperature can contain evidence of ideal shear texture components from both the bcc D1 after transformation to the hcp phase according to the Burgers orientation relationship and the hcp P1 shear textures. Thus, similar shear textures develop in friction stir welds of fcc, bcc and hcp materials.
- Fabrication Metallurgy
- Couplers, Fasteners and Joints