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Effect of Segregation of Secondary Phase Particles and “S” Line on Tensile Fracture Behavior of Friction Stir-Welded 2024Al-T351 Joints

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Abstract

A 5-mm-thick 2024Al-T351 plate was friction stir welded (FSWed) at welding speeds of 100, 200, and 400 mm min−1 with a constant rotation rate of 800 rpm, and the microstructure and tensile fracture behavior of the joints were investigated in detail. FSW resulted in the redistribution of secondary phase particles along the recrystallized grain boundaries at the nugget zone (NZ), forming linear segregation bands consisting of secondary phase particles. The segregation bands, mainly present in the shoulder-driven zone, were believed to result from periodic material flow, with the average band spacing on the longitudinal and horizontal cross sections equal to the tool advancement per revolution. At a low welding speed of 100 mm min−1, in spite of the highest density of segregation bands, the FSWed 2024Al-T351 joint fractured along the low hardness zone (LHZ) of the heat-affected zone because of large hardness gap between NZ and LHZ. Increasing the welding speed to 200 and 400 mm min−1 reduced both the hardness gap between NZ and LHZ and the density of segregation bands. In this case, the segregation bands played a role, resulting in unusual fracture of the joints along the segregation bands. The “S” line originated from the oxide film on the initial butting surfaces and did not affect the fracture behavior of the FSWed 2024Al-T351 joints.

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Acknowledgments

The current study was supported by (a) the National Outstanding Young Scientist Foundation of China under Grant No. 50525103 and (b) the Hundred Talents Program of 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, 72 Wenhua Road, Shenyang, 110016, P.R. China

    Z. Zhang (Assistant Professor), B. L. Xiao (Professor) & Z. Y. Ma (Professor)

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  1. Z. Zhang
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  2. B. L. Xiao
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  3. Z. Y. Ma
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Correspondence to Z. Y. Ma.

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Manuscript submitted September 8, 2012.

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Zhang, Z., Xiao, B.L. & Ma, Z.Y. Effect of Segregation of Secondary Phase Particles and “S” Line on Tensile Fracture Behavior of Friction Stir-Welded 2024Al-T351 Joints. Metall Mater Trans A 44, 4081–4097 (2013). https://doi.org/10.1007/s11661-013-1778-8

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