On the evaluation of the constrained studded pressing method for producing nanocrystalline copper sheets

Torkestani, Ahad; Dashtbayazi, M.R.

doi:10.3139/146.111914

Cited by 3 publications

(4 citation statements)

References 31 publications

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“…Regarding its cause, it is accepted that the plastic deformation can be related to the evolution of dislocations and the interaction of dislocations. There are several models suggested which deal with generation and annihilation of dislocations in plastic deformation of polycrystalline metals [24,25]. Also, the relationship between the microscopic plastic deformation mechanism and the notion of dislocation is generally accepted.…”

Section: Microstructure Observationsmentioning

confidence: 99%

Experimental and numerical investigation of severe plastic deformation of copper sheets processed by modified-constrained studded pressing

Kaykha

Dashtbayazi

2022

Mater. Res. Express

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In this study, mechanical behavior and microstructural evolution of copper sheets, produced by modified-constrained studded pressing (modified-CSP) as a severe plastic deformation (SPD) method, were investigated by experimental and numerical methods. A finite element model (FEM) was established to analyze distribution of equivalent plastic strain and residual stress for the complete first pass of the process. Local stress concentration was predicted by FEM. Also, copper sheets were deformed by the modified-CSP from the first to the tenth passes. The distribution of residual stress on the surface of the copper sheets was measured at each step of the process. Crack initiation and propagation were investigated by the non-destructive penetration test (PT). The residual stresses were predicted by X-ray diffraction (XRD) pattern analysis. The residual stresses were determined for the annealed and the first pass samples, +128.2 and +80.4 MPa, respectively. The maximum compression residual stress was -62.5 MPa for the tenth pass sample. The microstructural evolution including grain size and dislocation density of samples during the process were investigated. The average grain size had a significant decrease from ~35 μm to ~76 nm for annealed sample and tenth pass of modified-CSP, respectively.

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Section: Microstructure Observationsmentioning

confidence: 99%

Experimental and numerical investigation of severe plastic deformation of copper sheets processed by modified-constrained studded pressing

Kaykha

Dashtbayazi

2022

Mater. Res. Express

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“…The presence of sharp edges in the CSP dies was the main cause of stress concentration and local strain in sheets under plastic deformation [14]. So, the amount of plastic deformation of the sheet is limited in the CSP method.…”

Section: Illustration Of the Proposed Die Designmentioning

confidence: 99%

“…Regarding the cause, it is accepted that plastic deformation can be related to the evolution of dislocations and the interaction of dislocations. There are several models suggested that deal with generation and annihilation of dislocations in plastic deformation of polycrystalline metals [14,25]. Moreover, the relationship between the microscopic plastic deformation mechanism and the notion of dislocation is generally accepted.…”

Section: Tensile Propertiesmentioning

confidence: 99%

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An Improvement in Constrained Studded Pressing for Producing Ultra-Fine-Grained Copper Sheet

Kaykha

Dashtbayazi

2022

Metals

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In this study, constrained studded pressing (CSP) was modified to produce ultra-fine-grained copper sheets and is called modified-CSP. In modified-CSP, due to the selection of asymmetric semicircle studs, the maximum groove depth can increase up to three times the sheet thickness. In the CSP method, the groove depth is selected to be equal to the sheet thickness. To investigate the effective plastic strain, a finite element model (FEM) of modified-CSP was established. For this purpose, DEFORM-3D commercial software was used. A simulation showed that the modified-CSP process was capable of using higher strain, about 0.8 in each pass than in CSP. Copper sheets were deformed up to 10 passes by modified-CSP. The microstructure of the produced samples was analyzed. The results show that the grain size decreases in the first pass. In addition, with increasing plastic strain, the structure of the twins bands was observed. Mechanical properties, including tensile properties and Vickers microhardness, of the samples during the process were investigated. The strain inhomogeneity factor (SIF) and the hardness inhomogeneity factor (HIF) were used to quantitatively express the uniformity of distribution of effective plastic strain and Vickers microhardness, respectively. Compared with CSP and constrained groove pressing (CGP), the results showed that although the ultimate tensile strength (UTS) has significantly increased, the ductility values have remained almost constant. Moreover, in modified-CSP, the load-die stroke diagram increases almost evenly due to the removal of the stud interface area and progressive engagement. Therefore, modified-CSP copper sheets showed superior tensile properties such as good toughness.

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Comparing the Microstructure and Mechanical Properties of Pure Copper Sheets Subjected to Different Types of Constrained Dies Pressing

Faregh,

Raiszadeh,

Dashtbayazi

2023

Trans Indian Inst Met

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On the evaluation of the constrained studded pressing method for producing nanocrystalline copper sheets

Cited by 3 publications

References 31 publications

Experimental and numerical investigation of severe plastic deformation of copper sheets processed by modified-constrained studded pressing

Experimental and numerical investigation of severe plastic deformation of copper sheets processed by modified-constrained studded pressing

An Improvement in Constrained Studded Pressing for Producing Ultra-Fine-Grained Copper Sheet

Comparing the Microstructure and Mechanical Properties of Pure Copper Sheets Subjected to Different Types of Constrained Dies Pressing

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