Metallurgical and Materials Transactions A

, 40:920

First online:

Textures in Single-Crystal Aluminum Friction Stir Spot Welds

  • Toshiya ShibayanagiAffiliated withJoining and Welding Research Institute (JWRI), Osaka University
  • , Adrian P. GerlichAffiliated withDepartment of Chemical and Materials Engineering, University of Alberta Email author 
  • , Keizo KashiharaAffiliated withDepartment of Mechanical Engineering, Wakayama National College of Technology
  • , Thomas H. NorthAffiliated withDepartment of Materials Science and Engineering, University of Toronto

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The present article examines the textural features produced during friction stir spot welding of single-crystal aluminum sheet. The crystal has the {111} plane perpendicular to the normal direction (ND) of the sheet, and the \( \left\langle { 1 10} \right\rangle \) direction parallel to the growth direction (GD). Friction stir spot welding was carried out using a rotation speed of 1500 rpm and a dwell time of 2 seconds, and completed spot welds were characterized using a combination of optical microscopy and electron backscatter diffraction (EBSD). The EBSD measurements indicate there are no significant changes in orientation in locations more than 840 μm from the stir-zone extremity. The orientation distribution in the thermomechanically-affected zone (TMAZ) region conformed with the {110}⊥ND orientation within 580 μm of the stir-zone extremity. In the location immediately adjacent to the stir-zone extremity, there was a deviation from the {110}//ND orientation due to a combination of compressive loading perpendicular to the stir-zone boundary and shear loading in the direction of tool rotation. It is suggested a {111}⊥ND texture in the stir zone is associated with material flow imposed by the thread on the rotating pin.