Microstructure and mechanical properties of friction stir welded copper

Sakthivel, T.; Mukhopadhyay, J.

doi:10.1007/s10853-007-1666-y

Cited by 74 publications

(36 citation statements)

References 6 publications

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“…On the other hand, when 2 mm thick copper plates with average grain size of 30 µm were welded at 1000 rpm and 0.5 mm/s low welding speed, nugget (128-136 HV) was harder than the base metal (106-111 HV) due to reduction in average grain size to 11 µm [172]. Flores et al have also shown that as-cast AA 7073 showed that weld nugget was harder than base metal while the 50 % cold-rolled alloy showed reduced hardness in the nugget [173].…”

Section: Copper Alloysmentioning

confidence: 99%

Recent advances in friction-stir welding – Process, weldment structure and properties

Nandan

DebRoy

Bhadeshia

2008

Progress in Materials Science

1,810

911

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Friction stir welding is a refreshing approach to the joining of metals. Although originally intended for aluminium alloys, reach of FSW has now extended to a variety of materials including steels and polymers. This review deals with the fundamental understanding of the process and its metallurgical consequences. The focus is on heat generation, heat transfer and plastic flow during welding, elements of tool design, understanding defect formation and the structure and properties of the welded materials.

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Section: Copper Alloysmentioning

confidence: 99%

Recent advances in friction-stir welding – Process, weldment structure and properties

Nandan

DebRoy

Bhadeshia

2008

Progress in Materials Science

1,810

911

View full text Add to dashboard Cite

show abstract

“…The Hall-Petch relation would be valid if grains were dislocation free. Therefore, it can be argued that the other factors should affect the microstructure properties of the nugget zone such as subboundaries, subgrains, dislocations, and second phases [1,[9][10][11][12]. As already mentioned, the increase of the rotation speed and the degree of deformation resulted in the increase of dislocation densities in recrystallized grains.…”

Section: Hardness Evaluationmentioning

confidence: 99%

Optimum Rotation Speed for the Friction Stir Welding of Pure Copper

Jabbari

Tutum

2013

ISRN Materials Science

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The friction stir welding (FSW) was conducted in the pure copper plates with the thickness of 4 mm in the constant traverse speed of 25 mm/min and five different rotation speeds. Analysis of metallographic images showed that the increasing of the rotation speed results in the increase of grain size in the nugget zone. Vickers hardness tests were conducted on the weld samples and the maximum hardness obtained in rotation speed of 900 rpm. Results of the tensile tests and their comparison with that of the base metal showed that the maximum strength and the minimum elongation are achieved again in this rotation speed. Yield strength and ultimate tensile strength increased with the decrease in grain size in the nugget region, and the yield strength obeyed = 172.77+59.33Hall-Petch relationship. Hence, the hardness values do not follow the relationship.

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“…However, due to the extreme high thermal diffusivity (i.e., approximately 10 to 100 times higher than that in some steels and nickel alloys [5][6][7]), copper alloys are generally classified as non-weldable alloys which cannot be fabricated by conventional techniques, such as fusion welding. Durocher et al [8,9], Drezet et al [10], and Gogari [11] found that hot cracking frequently occurs during electron beam welding of the CuCrZr alloys.…”

Section: Introductionmentioning

confidence: 99%

Study of the Microstructure Evolution and Properties Response of a Friction-Stir-Welded Copper-Chromium-Zirconium Alloy

Lai

et al. 2017

Metals

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Abstract:In this article, the copper-chromium-zirconium (CuCrZr) alloys plates with 21 mm in thickness were butt joined together by means of FSW (friction stir welding). The properties of the FSW joints are studied. The microstructure variations during the process of FSW were investigated by optical microscopy (OM), electron back-scattered diffraction (EBSD), and transmission electron microscopy (TEM). The results show that the grains size in the nugget zone (NZ) are significantly refined, which can be attributed to the dynamic recrystallization (DRX). The microstructure distribution in the NZ is inhomogeneous and the size of equiaxed grains are decreased gradually along the thickness direction from the top to bottom area of the welds. Meanwhile, it is found that the micro-hardness and tensile strength of the welds are slightly increased along the thickness direction from the top to the bottom area of the welds. All the nano-strengthening precipitates in the BM are dissolved into the Cu matrix in the NZ. Therefore, the decreases in hardness, tensile strength, and electrical conductivity can be attributed to the comprehensive effect of dissolution of nano-strengthening precipitates into the supersaturation matrix and severe DRX in the welded NZ.

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Microstructure and mechanical properties of friction stir welded copper

Cited by 74 publications

References 6 publications

Recent advances in friction-stir welding – Process, weldment structure and properties

Recent advances in friction-stir welding – Process, weldment structure and properties

Optimum Rotation Speed for the Friction Stir Welding of Pure Copper

Study of the Microstructure Evolution and Properties Response of a Friction-Stir-Welded Copper-Chromium-Zirconium Alloy

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