Intercalation vortices and related microstructural features in the friction-stir welding of dissimilar metals

Murr, Lawrence E.; Liu, Ying; Flores, Ricardo Daniel; Trillo, Elizabeth; McClure, Joshua P.

doi:10.1007/s100190050078

Cited by 170 publications

(89 citation statements)

References 14 publications

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“…A more precise metallographic analysis (Fig. 5) showed that TMAZ is constituted by a region of extremely fine and equiaxed grain structure (the weld nugget), resulting from extensive thermomechanical deformation that induces dynamic recrystallisation and recovery in this region [27], and by a narrow band of highly deformed non-recrystalized grains. In the HAZ, it was observed that the temperatures attained were not sufficient to induce any hardness change of the base material in this region.…”

Section: Hardness Test Resultsmentioning

confidence: 99%

“…When the AA5xxx alloy series are used in the annealed condition the microstructure is stable and usually no softening occurs in the TMAZ and HAZ. In contrast, when these alloys are used in the strain hardened condition, the work hardened structure will readily recover and/or recrystallize during welding, and softening may occur [9,10,[25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

et al. 2009

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a b s t r a c tThe tensile behaviour of similar and dissimilar friction stir welds in 1 mm thick sheets of two aluminium alloys (AA5182-H111 and AA6016-T4) is analysed in this paper. The heterogeneity in properties across the welds was studied by performing microhardness tests and microstructural analysis. The tensile tests were performed in samples extracted longitudinal and transverse to the weld direction. It was found that the tensile behaviour of the welds depends mainly on the grain size in the TMAZ, for the AA5182-H111 alloy, and on precipitate distribution, for the AA6016-T4 alloy. In all types of welds, the HAZ preserves the same properties of the base materials. The global mechanical behaviour of the AA5182-H111 similar welds is very similar to that of the base material. However, for the AA6016-T4 similar welds and for the AA6016-T4-AA5182-H111 dissimilar welds a 10-20% strength reduction relative to the base materials and important losses in ductility were reported.

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Section: Hardness Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

et al. 2009

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“…The microstructure exhibited by the dissimilar welds is comparable to those of similar welds, but with singular lamellae flow pattern of the base materials in the stir zone. This was interpreted as due to the differential viscosity of each alloy during welding [14]. Ying et al [15] have also studied the system 2024/6061 describing microstructural development and related mechanical properties of this joint.…”

Section: Introductionmentioning

confidence: 99%

Preliminary study on the microstructure and mechanical properties of dissimilar friction stir welds in aircraft aluminium alloys 2024-T351 and 6056-T4

Amancio‐Filho

Sheikhi

Santos

et al. 2008

Journal of Materials Processing Technology

163

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Aircraft aluminium alloys generally present low weldability by traditional fusion welding process. The development of the friction stir welding has provided an alternative improved way of satisfactory producing aluminium joints, in a faster and reliable manner. In the present work dissimilar Al alloys (AA2024-T351 and AA6056-T4) were friction stir welded. Butt joints were obtained by varying process parameters, namely the rotational speed (500-1200 rpm) and the welding speed (150-400 mm/min.), while axial force and tool geometry were kept constant. Parameter optimisation, which has been based on the results of

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“…Detailed metallographic analysis revealed that the TMAZ of these welds was composed by very fine and equiaxed grains, with average grain size of 5 µm and 3 µm for the lowest (320 mm.min -1 ) and the highest (640 mm.min -1 ) traverse speeds, respectively. Grain refinement results from the dynamic recrystallization process induced by both the extensive plastic deformation and the heat generated in the process, as mentioned by Murr et al [31]. TEM analysis revealed a sub grain structure inside the TMAZ, with high density of dislocations, as is exemplified in Figures 10.a and b, for the A82-112-32 and A82-112-64 welds.…”

Section: Effect Of Traverse Speed On Weld Strengthmentioning

confidence: 63%

Friction Stir Welding of very thin plates

et al. 2012

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Intercalation vortices and related microstructural features in the friction-stir welding of dissimilar metals

Cited by 170 publications

References 14 publications

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

Mechanical behaviour of similar and dissimilar AA5182-H111 and AA6016-T4 thin friction stir welds

Preliminary study on the microstructure and mechanical properties of dissimilar friction stir welds in aircraft aluminium alloys 2024-T351 and 6056-T4

Friction Stir Welding of very thin plates

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