Microstructural analysis of stir zone of Al alloy produced by friction stir spot welding

M. Fujimoto, S. Koga, N. Abe, Yutaka Sato, Hiroyuki Kokawa

研究成果: Article査読

38 被引用数 (Scopus)


Friction stir spot welding (FSSW), which was recently developed as a spot joining technique, has been applied to a lap joint of Al alloy 6061 sheets, 1 mm in thickness, to clarify its microstructural features of the joint. A nugget shaped stir zone having finer grain size was observed around the exit hole of the probe. Crystallographic texture analyses using EBSD method suggested that the material flow occurred along the rotating direction of the FSSW tool in the wide region including the stir zone. In the periphery of the nugget shaped stir zone, which was characterised by finer grain size than the stir zone interior, no inclusions or precipitates were found on the SEM scale. A softened region was formed around the joint centre, which could be explained as resulting from dissolution and/or growth of the strengthening precipitates due to thermal cycle of FSSW.

ジャーナルScience and Technology of Welding and Joining
出版ステータスPublished - 2008 10月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学


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