Microstructure and Texture Analysis of Friction Stir Welds of Copper

Saukkonen, Tapio; Savolainen, Kati; Mononen, Jukka; Hänninen, Hannu

doi:10.1002/9780470444191.ch6

Cited by 5 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As compared to aluminium with high SFE (typically 166 mJ m 22 ), copper behaves differently in FSW and the knowledge from a large number of studies of FSW of aluminium cannot be directly applied. The restoration mechanism operating in FSW of copper is dynamic recrystallisation (DRX) 17 and the developing DRX texture of copper is weak. [17][18][19] The mechanism of DRX is different when the SFE is high, as for aluminium.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Banding in copper friction stir weld

Savolainen

Saukkonen

Hänninen

2012

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

Formation and microstructure of banding in a copper friction stir weld was studied using scanning electron microscopy, electron backscatter diffraction, and nanoindentation. Unlike in aluminium, banding only appears in 'cold' friction stir welding (FSW) welds of copper. Banding is formed by layers of small and large grains. It was noticed that higher local misorientations and small grain size correlate in the welds. Owing to differences in the restoration processes of copper and aluminium, texture changes are not visible in copper even though they are in aluminium. Texture of copper FSW welds is weak and independent of the grain structure of the base material, because in the steady state dynamic recrystallisation, the restoration process of copper, the grain structure is mainly dependent of the processing parameters. The hardness differences between the small and large grains are small.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The restoration mechanism operating in FSW of copper is dynamic recrystallisation (DRX) 17 and the developing DRX texture of copper is weak. [17][18][19] The mechanism of DRX is different when the SFE is high, as for aluminium. Dynamic recrystallisation of aluminium is termed as continuous DRX, when dynamic recovery can also operate.…”

Section: Resultsmentioning

confidence: 99%

Banding in copper friction stir weld

Savolainen

Saukkonen

Hänninen

2012

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

show abstract

“…Some of these processing lines are clearly associated with a concentration of oxide particles, but on other processing lines no features explaining their origin can be detected by FEG-SEM. In the lower part of the FSW weld, a change in the morphology of small Cu 2 S precipitates has been observed across the processing line [11]. This can be a partial explanation to the optical contrast difference at the boundaries in the macro-section of the FSW weld.…”

Section: Figure 7 Ebsd Maps Of the Transverse Cross-section Of The Ementioning

confidence: 88%

Localization of Plastic Deformation in Copper Canisters for Spent Nuclear Fuel

Savolainen

Saukkonen²,

Hänninen³

2012

WJNST

View full text Add to dashboard Cite

Localization of plastic deformation in different parts (extruded and forged base materials as well as EB and FSW welds) of the corrosion barrier copper canister for final disposal of spent nuclear fuel was studied using tensile testing, optical strain measurement, scanning electron microscopy (SEM), and electron back-scatter diffraction (EBSD). Results show that in the base materials plastic deformation occurs very uniformly. In FSW welds the deformation localizes in the weld either at the processing line or at a line of entrapped oxide particles. In EB welds the deformation localizes to the equally oriented large grains at the weld centreline or at the steep grain size gradient in the fusion line

show abstract

“…In lower SFE materials such as copper alloys and austenitic stainless steels, static recrystallisation can produce thermally stable grains having different orientations from those developed during the stirring process. Saukkonen et al 30 reported that a weak 〈101〉 fibre texture was developed by DDRX during FSW of copper. Oh-Ishi et al 31 studied the textures produced during FSW of a Ni–Al bronze and found that while A - and B -type fcc ideal shear texture components developed just outside of the stir zone, the stir zone itself exhibited a random texture which was attributed to PSN.…”

Section: Textures Observed In Fcc Materialsmentioning

confidence: 99%

Texture development in friction stir welds

Fonda¹,

Knipling²

2011

Science and Technology of Welding and Joining

267

127

View full text Add to dashboard Cite

The shear textures that develop in friction stir welds are reviewed and discussed. In all the materials examined, including face centred cubic (fcc), body centred cubic (bcc) and hexagonal close-packed (hcp) materials, friction stir welding produces a predominant shear texture with the close-packed directions aligned with the shear direction (SD) and the close-packed plane normal perpendicular to both the SD and the shear plane normal. This orientation corresponds to the B/ B B ideal shear texture in fcc materials, the D 1 ideal shear texture in bcc materials, and the P 1 ideal shear texture in hcp titanium alloys. Titanium friction stir welds fabricated above the b transus temperature can contain evidence of ideal shear texture components from both the bcc D 1 (after transformation to the hcp phase according to the Burgers orientation relationship) and the hcp P 1 shear textures. Thus, similar shear textures develop in friction stir welds of fcc, bcc and hcp materials.

show abstract

Microstructure and Texture Analysis of Friction Stir Welds of Copper

Cited by 5 publications

References 0 publications

Banding in copper friction stir weld

Banding in copper friction stir weld

Localization of Plastic Deformation in Copper Canisters for Spent Nuclear Fuel

Texture development in friction stir welds

Contact Info

Product

Resources

About