Strength and ductility of heavily drawn bundled Cu-Nb filamentary microcomposite wires with various Nb contents

Hong, Sun Ig; Kim, H. S.; Hill, Mary Ann

doi:10.1007/s11661-000-0191-2

Cited by 15 publications

(26 citation statements)

References 29 publications

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“…[6] The strength of Cu±Fe microcomposites can be considered to be the sum of the substructure strengthening component due to elongated grains and/or subgrains, the phase-boundary strengthening term associated with the Hall±Petch type interaction between dislocations and phase boundaries, and the precipitation strengthening component. [6,22] The contributions from phase-boundary strengthening, r PB , due to Fe filaments increases with increasing Fe content [22] and with increasing drawing strain. [6] However, the contribution from substructure strengthening, r sub , decreases with increasing Fe content and with increasing drawing strain since more grain or subgrain boundaries are absorbed at Cu/Fe phase boundaries with increasing Fe content [22] and drawing strain.…”

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

“…[6,22] The contributions from phase-boundary strengthening, r PB , due to Fe filaments increases with increasing Fe content [22] and with increasing drawing strain. [6] However, the contribution from substructure strengthening, r sub , decreases with increasing Fe content and with increasing drawing strain since more grain or subgrain boundaries are absorbed at Cu/Fe phase boundaries with increasing Fe content [22] and drawing strain. [6] These observations support an increasing importance of interphase barrier strengthening with decreasing filament size and spacing with increasing drawing strain.…”

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

“…Table 2 shows the ratios of yield strengths, ultimate tensile strength values (UTS), and Young's moduli of as-drawn Cu-Fe±Ag wires at 298 and 77 K. The ratio of yield stresses (0.92) is close to that of Young's moduli (0.91), suggesting that the yield strength is primarily controlled by athermal obstacles. [6,22] A slight decrease of the UTS ratio is thought to be associated with an increasing contribution of thermal obstacles, such as dislocations during deformation. [22] However, the observation that the ratio of UTS is still quite close to that of Young's moduli strongly indicates that athermal obstacles are dominant barriers at the UTS.…”

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

“…[6,22] A slight decrease of the UTS ratio is thought to be associated with an increasing contribution of thermal obstacles, such as dislocations during deformation. [22] However, the observation that the ratio of UTS is still quite close to that of Young's moduli strongly indicates that athermal obstacles are dominant barriers at the UTS. All these observations strongly suggest that Fe filaments and grain boundaries (and/or subgrain boundaries) act as athermal barriers to plastic flow.…”

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

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Copper-Iron Filamentary Microcomposites

Hong¹

2001

Adv. Eng. Mater.

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The Cu–Fe system is of particular interest because of the relatively low cost of Fe compared to other insoluble BCC phases such as Nb, Mo, Cr, and Ta. The relatively high solubility of Fe in Cu at high temperatures, coupled with the slow kinetics of Fe precipitation at low temperatures is, however, known to reduce electrical conductivity. The key to improving strength/conductivity properties is to reduce the initial dendrite size and to precipitate Fe effectively in the Cu matrix. Thermomechanical treatments have been employed by some investigators to optimize the strength and conductivity of Cu–Fe microcomposites. The study also shows that refinement of dendrites and easier nucleation of precipitates by the addition of third alloying elements can lead to improved strength/conductivity properties of Cu–Fe microcomposites.

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Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

Section: Development Of Microstructure and Propertiesmentioning

confidence: 99%

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Copper-Iron Filamentary Microcomposites

Hong¹

2001

Adv. Eng. Mater.

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“…Hong et al [26] described the strength of Cu base composite as the sum of 1) the substructure strengthening component due to elongated grains, subgrains and/or cells, 2) the interface strengthening term associated with the Hall-Petch type interaction between dislocations and interfaces, and 3) the precipitate strengthening component. The contributions from interface strengthening increase with an increasing content of the element which constitutes the second phase [26].…”

Section: The Effects Of Alloying and Pressing Routes In Equal Channelmentioning

confidence: 99%

The effects of alloying and pressing routes in equal channel angular pressing of Cu-Fe-Cr and Cu-Fe-Cr-Ag composites

2009

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Equal channel angular pressing (ECAP) was carried out on Cu-Fe-Cr and Cu-Fe-Cr-Ag composites at room temperature. ECAPed Cu-Fe-Cr and Cu-Fe-Cr-Ag exhibited ultrafine-grained microstructures with the shape and distribution of Fe-Cr phase were dependent on the processing routes. In route A, the initial dendrites of Fe-Cr phase were elongated along the shear direction and developed into filaments, whereas in route Bc the initial dendrites became finer by fragmentation with no pronounced change of the shape. The hardness of ECAPed Cu-Fe-Cr-Ag is greater than that of ECAPed Cu-Fe-Cr. The higher hardness in Cu-Fe-Cr-Ag is ascribed to the more effective matrix strengthening due to the dislocation storage and the precipitation hardening. The hardness of ECAPed Cu-Fe-Cr was lower than that of the drawn Cu-Fe-Cr at the same deformation strain because of the less effective refinement and elongation of the two-phase filamentary microstructure. The addition of silver was found to increase the hardness of the ECAPed composite above the strength level of heavily drawn Cu-Fe-Cr, rendering the processing method of applying alloying and ECAP to Cu-Fe-Cr composite an attractive approach to producing bulky high strength Cu base composites.

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Low‐Pressure Nitrocarburizing in Standard Vacuum Furnaces—Preliminary Studies

Pawęta,

Galeziewska,

Rewers

et al. 2023

Adv Eng Mater

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For the first time, low‐pressure nitrocarburizing process is performed in a minorly modified standard vacuum furnace on 16MnCr5 alloy steel samples. Ammonia and acetylene are used as a source of nitrogen and carbon, respectively. Lowering the pressure of the process ensures longer and more efficient ammonia dissociation. To prove the safety of the process, exhaust gases are investigated online using residual gas analyzer mass spectrometer, whereas reaction products deposited on the sample's surface are studied by means of time‐of‐flight secondary ion mass spectrometer. Possible reactions taking place in the atmosphere of the chamber are written down. In the results of conducted examinations, it is confirmed that no toxic gases are generated, and no cyanides and polycyclic aromatic hydrocarbons are formed during the process. Additionally, microstructure analysis of the cross sections of nitrocarburized sample is performed using scanning electron microscopy (SEM) and optical microscopy. It confirms the diffusion of nitrogen and carbon into the near surface layer. SEM/energy‐dispersive X‐ray spectroscopy analysis demonstrates precipitation of carbide and carbonitride, what is proved by X‐ray diffractometer and microhardness profile analysis. The presented low‐pressure nitrocarburizing results in an increase in hardness from about 200 to over 500 HV and the formation of an effective case depth of about 20 μm, after only 20 min of the process.

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Strength and ductility of heavily drawn bundled Cu-Nb filamentary microcomposite wires with various Nb contents

Cited by 15 publications

References 29 publications

Copper-Iron Filamentary Microcomposites

Copper-Iron Filamentary Microcomposites

The effects of alloying and pressing routes in equal channel angular pressing of Cu-Fe-Cr and Cu-Fe-Cr-Ag composites

Low‐Pressure Nitrocarburizing in Standard Vacuum Furnaces—Preliminary Studies

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