Enhancing the Electrical Conductivity of Electrolytic Tough Pitch Copper Rods Processed by Incremental Equal Channel Angular Pressing

Ciemiorek, Marta; Pawliszak, Łukasz; Chromiński, Witold; Olejnik, Lech; Lewandowska, M.

doi:10.1007/s11661-020-05818-w

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…Kumar et al [35] explained the reduction of EC of the oxygen-free high conductivity Cu through cyclic channel die compression by increasing the density of deformation-induced defects such as point defect, dislocation density, and grain boundaries. A similar finding of decreasing the EC by increasing the number of passes was reported by Ko et al [36] for Cu-3 wt%Ag alloy and Wei et al [37] for pure Cu. On of contrary, Ciemiorek et al [38] reported the reduction of the Ec of Cu during the first pass while it revealed a subsequent increase as it processed through 8-passes.…”

Section: Electrical Conductivitysupporting

confidence: 85%

Influence of ECAP Parameters on Electrical Conductivity and Hardness of Pure Cu

EL-Shenawy¹,

El-Garaihy²,

El-Hadek³

et al. 2022

Port-Said Engineering Research Journal

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In this study, the ECAP pprocess was conducted using two different dies of channel angles (Φ) 120° and 90° to extrude pure Cu for 2 and 6 passes of route Bc at room temperature. Optical Microscopy (OM) was used to study the microstructure of Cu before and after ECAP processing. Vickers's microhardness was measured along the transvers section of the Cu billets. The electrical conductivity of the Cu billets was measured at room temperature and expressed as a relative percentage of the international annealed copper standard. 2-passes using the two dies revealed an elongated ultrafine-grained structure that aligned parallel to the extrusion direction. 6 passes using the 90°-die resulted in more ultrafine-grained equiaxed structure compared to the Cu billets processed through the 120°-die. Processing through 6-passes revealed a significant increase in the Cu Vickers's microhardness by 56% and 72% through processing using the using the 120°-die and 90°-die, respectively when it put in comparison with the as-annealed samples. The electrical conductivity finding revealed that ECAP processing up to 6-passes resulted in insignificant decrease of 6.6% compared to the as-annealed counterpart which indicated that ECAP processing can strengthen the Cu billets without losing its electrical conductivity

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Section: Electrical Conductivitysupporting

confidence: 85%

Influence of ECAP Parameters on Electrical Conductivity and Hardness of Pure Cu

EL-Shenawy¹,

El-Garaihy²,

El-Hadek³

et al. 2022

Port-Said Engineering Research Journal

View full text Add to dashboard Cite

show abstract

“…Research on the Cu-3 wt% Ag alloy and pure Cu by Ko et al [62] and Wei et al [54] further verified the previously documented drop in EC with the number of ECAP passes. However, Ciemiorek et al [72] discovered that after the first pass, the E C of Cu dropped, only for the E C to climb once again with the addition of subsequent passes until there were eight. Finally, Cho et al [73] studied the Cu-15Ag alloy and discovered that for 8-pass processing, the greatest E C values were obtained, in decreasing order, by routes C, A, and Bc.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Investigation of the Effect of ECAP Parameters on Hardness, Tensile Properties, Impact Toughness, and Electrical Conductivity of Pure Cu through Machine Learning Predictive Models

et al. 2022

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Copper and its related alloys are frequently adopted in contemporary industry due to their outstanding properties, which include mechanical, electrical, and electronic applications. Equal channel angular pressing (ECAP) is a novel method for producing ultrafine-grained or nanomaterials. Modeling material design processes provides exceptionally efficient techniques for minimizing the efforts and time spent on experimental work to manufacture Cu or its associated alloys through the ECAP process. Although there have been various physical-based models, they are frequently coupled with several restrictions and still require significant time and effort to calibrate and enhance their accuracies. Machine learning (ML) techniques that rely primarily on data-driven models are a viable alternative modeling approach that has recently achieved breakthrough achievements. Several ML algorithms were used in the modeling training and testing phases of this work to imitate the influence of ECAP processing parameters on the mechanical and electrical characteristics of pure Cu, including the number of passes (N), ECAP die angle (φ), processing temperature, and route type. Several experiments were conducted on pure commercial Cu while altering the ECAP processing parameters settings. Linear regression, regression trees, ensembles of regression trees, the Gaussian process, support vector regression, and artificial neural networks are the ML algorithms used in this study. Model predictive performance was assessed using metrics such as root-mean-squared errors and R2 scores. The methodologies presented here demonstrated that they could be effectively used to reduce experimental effort and time by reducing the number of experiments runs required to optimize the material attributes aimed at modeling the ECAP conditions for the following performance characteristics: impact toughness (IT), electrical conductivity (EC), hardness, and tensile characteristics of yield strength (σy), ultimate tensile strength (σu), and ductility (Du)

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“…The electrical conductivity of UFG copper after 5 ECAP passes decreases by only 8% [23] and starts to increase slightly with subsequent passes [25], but never reaches the value of the initial material. In [29], it was proven that short-term annealing at low a temperature after ECAP processing results in relatively high electrical conductivity and while preserving the beneficial mechanical properties. These results indicate that ECAP processing makes it possible to manufacture a high-strength material whose electrical conductivity is only slightly lower than that of the initial, coarse-grained material.…”

Section: Introductionmentioning

confidence: 99%

Solid-state welding of ultrafine grained copper rods

Morawiński

Jasiński

Ciemiorek

et al. 2021

Archiv.Civ.Mech.Eng

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The article focuses on the Direct Drive Rotary Friction Welding of ultrafine-grained copper rods, which feature increased mechanical properties and good electrical properties, yet are limited in size. The use of UFG metals is often limited by the too small dimensions of semi-finished elements produced by SPD methods. Therefore, the production of finished machine parts from UFG metals is currently economically unjustified. Dismissal of dimensional limitations can be done by introducing joining to technological processes. The proposed joining method does not lead to a melting of the material in the joining zone or excessive degradation of the UFG microstructure. To obtain the best results, the research used the method of low-energy welding of two kinds of specimens: with a flat or a conical contact surface. In the article, the authors present, by means of metallographic microsections and microhardness measurements, the influence of rotational speed, welding pressure and conical shape contact surface on the quality of the obtained joints. The conducted research made it possible to obtain good quality joints whose microhardness is reduced only by about 10% in comparison with the base material and the tensile strength dropped from only 397–358 MPa.

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Enhancing the Electrical Conductivity of Electrolytic Tough Pitch Copper Rods Processed by Incremental Equal Channel Angular Pressing

Cited by 7 publications

References 25 publications

Influence of ECAP Parameters on Electrical Conductivity and Hardness of Pure Cu

Influence of ECAP Parameters on Electrical Conductivity and Hardness of Pure Cu

Investigation of the Effect of ECAP Parameters on Hardness, Tensile Properties, Impact Toughness, and Electrical Conductivity of Pure Cu through Machine Learning Predictive Models

Solid-state welding of ultrafine grained copper rods

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