Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Su, Jianping; Nelson, Tracy W.; McNelley, Terry R.; Mishra, Rajiv S.

doi:10.1016/j.msea.2011.03.043

Cited by 84 publications

(24 citation statements)

References 42 publications

(49 reference statements)

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“…SSDs are generated by the interactions of dislocations with defects, grain boundaries, twin boundaries and dislocations themselves (Peng et al, 2009) whereas GNDs are additional dislocations needed to provide compatible deformation by accommodating the strain gradients during deformation through lattice rotation (Gao and Huang, 2003). Earlier studies (Su et al, 2011) on structural evolution during severe plastic deformation using strain gradient plasticity theory, indicates that GNDs and SSDs play important role in the formation of cell blocks and micro-band structures which are considered as vital precursors for eventual grain refinement resulting in fine cellular/sub-grained structures. Plastic deformation in polycrystalline materials results in activation of favourably oriented slip systems within each grain which in turn generates GNDs for maintaining strain compatibility.…”

Section: Factors Influencing Grain Refinement In Cgp Processmentioning

confidence: 99%

Mechanical behaviour and microstructural evolution of constrained groove pressed nickel sheets

Kumar

Raghu

2013

Journal of Materials Processing Technology

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Section: Factors Influencing Grain Refinement In Cgp Processmentioning

confidence: 99%

Mechanical behaviour and microstructural evolution of constrained groove pressed nickel sheets

Kumar

Raghu

2013

Journal of Materials Processing Technology

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“…This technique is used for modifying the microstructure of metals, surface composites production, homogenizing the nano-phase aluminum alloys, and refinement of the microstructure of the cast aluminum alloys [17][18][19][20]. Additionally, this process is energy efficient, versatile and environmentally appropriate [17].…”

Section: Introductionmentioning

confidence: 99%

“…Su et al [18] achieved a nanostructured copper (with grain sizes between 50 to 300 nm) via a single pass FSP. They used tools with small shoulder sizes together with rapid cooling of the sample during the process.…”

Section: Introductionmentioning

confidence: 99%

On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

et al. 2018

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The effect of prior constrained groove pressing on friction stir processing (FSP) of pure copper was investigated. The results illustrate the development of high strain and strength of FSP samples along with an increased strength base metal as a result of applying for a prior constrained groove pressing (CGP) pass. The influences of further FSP passes on the microstructures, and mechanical properties were also shown. The microstructural evaluation of the specimens indicated up to 10 times grain size reduction in FSP specimens as well as equiaxed microstructural morphology. Mechanical properties of the specimens were carried out through tensile and microhardness tests. It was demonstrated that the FSP could improve the strength and ductility of the specimens simultaneously through improved mechanical properties of the base metal resulting from prior CGP. The performed calculations show that values of dislocation density of the CGPed specimens experienced significant change after applying for FSP passes.

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“…In fact, Su et al [30] friction stir processed oxygen-free high thermal conductivity copper (C10100) using a continuous quenching technology with the aim of enhancing the cooling rates. The production of nanocrystalline structures with 174 nm was reported by the authors.…”

Section: Introductionmentioning

confidence: 99%

Effect of friction stir processing parameters on the microstructural and electrical properties of copper

Leal

Galvão

Loureiro

et al. 2015

Int J Adv Manuf Technol

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Friction stir processing (FSP) is an innovative technology, based on friction stir welding (FSW) operative principles, which can be used for changing locally the microstructure and the mechanical properties of conventional materials. In this work, the copper alloy C12200 was friction stir processed using two distinct tools, i.e. a scrolled and a conical shoulder tool, in order to promote different thermomechanical conditions inside the stirred volume, and consequently, varied post-processed microstructures. The influence of the tool geometry and tool rotation and traverse speeds on the microstructural and electrical properties of the processed copper alloy was analysed. The processing conditions were found to have an important influence on the electrical conductivity of the processed material. The differences in electrical conductivity were explained based on dislocations density effects. The effect of the dislocations density on electrical conductivity of the processed material was found to prevail over the effect of the grain boundaries.

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Development of nanocrystalline structure in Cu during friction stir processing (FSP)

Cited by 84 publications

References 42 publications

Mechanical behaviour and microstructural evolution of constrained groove pressed nickel sheets

Mechanical behaviour and microstructural evolution of constrained groove pressed nickel sheets

On the role of applying groove pressing technique before friction stir processing of copper: microstructure and mechanical evaluation

Effect of friction stir processing parameters on the microstructural and electrical properties of copper

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