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Influence of Tool Dimension and Welding Parameters on Microstructure and Mechanical Properties of Friction-Stir-Welded 6061-T651 Aluminum Alloy

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Abstract

Six-millimeter-thick 6061Al-T651 plates were friction stir welded with varied welding parameters and tool dimensions. The low hardness zones (LHZs), determined by constructing the hardness distribution maps around the heat-affected zones, changed the location and inclination with the welding conditions, but the hardness values of the LHZs were mainly dependent on the welding speed. The thermal cycles experienced by the LHZs had approximately the same peak temperature of 360 °C to 370 °C with varied durations that were governed by the welding speed. The microstructure of the LHZs was characterized by a low density of β′ precipitates, which tended to reduce with increasing the welding speed. The fracture of the welds occurred along the LHZs, and the tensile strength of the welds increased with increasing the welding speed and was independent of the tool dimension and the rotation rate. A heat source zone-isothermal dissolution layer model was proposed to explain the observed effects.

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Notes

  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

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Acknowledgments

The author gratefully acknowledges the support of (a) the National Outstanding Young Scientist Foundation with Grant No. 50525103 and (b) the Hundred Talents Program of the Chinese Academy of Sciences.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    F.C. Liu (Postgraduate) & Z.Y. Ma (Professor)

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  1. F.C. Liu
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  2. Z.Y. Ma
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Correspondence to Z.Y. Ma.

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Manuscript submitted December 24, 2007.

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Liu, F., Ma, Z. Influence of Tool Dimension and Welding Parameters on Microstructure and Mechanical Properties of Friction-Stir-Welded 6061-T651 Aluminum Alloy. Metall Mater Trans A 39, 2378–2388 (2008). https://doi.org/10.1007/s11661-008-9586-2

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