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

Mitsuo Fujimoto, Shinji Koga, Natsumi Abe, Yutaka Sato, Hiroyuki Kokawa

研究成果: Article査読

4 被引用数 (Scopus)

抄録

The present study applied friction spot joining (FSJ), which was recently developed as a lap joining technique of Al alloys, to two sheets of Al alloy 6061, 1 mm in thickness, and then examined the microstructural feature in the weld. The weld had the nugget-shaped stir zone around the exit hole of the probe, and the stir zone exhibited the equiaxed grain structure having finer grain size than that of the base material. The crystallographic texture analysis using electron backscattered diffraction method suggested that the material movement occurred along the rotating direction of the welding tool in the wide region including the stir zone. In the periphery of the nugget-shaped stir zone, which was characterized as the region having the finer grain size than that of the stir zone interior, any inclusions and precipitates were not found in the SEM scale. The weld was softened around the weld centre. The softening could be explained by dissolution and/or growth of the strengthening precipitates due to thermal cycle of FSJ.

本文言語English
ページ(範囲)403-410
ページ数8
ジャーナルWelding International
23
6
DOI
出版ステータスPublished - 2009 7 22

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金

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