Metallurgical and Materials Transactions A

, 40:920

Textures in Single-Crystal Aluminum Friction Stir Spot Welds

Authors

  • Toshiya Shibayanagi
    • Joining and Welding Research Institute (JWRI)Osaka University
    • Department of Chemical and Materials EngineeringUniversity of Alberta
  • Keizo Kashihara
    • Department of Mechanical EngineeringWakayama National College of Technology
  • Thomas H. North
    • Department of Materials Science and EngineeringUniversity of Toronto
Article

DOI: 10.1007/s11661-008-9766-0

Cite this article as:
Shibayanagi, T., Gerlich, A.P., Kashihara, K. et al. Metall and Mat Trans A (2009) 40: 920. doi:10.1007/s11661-008-9766-0

Abstract

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.

Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009