Characterization of the strength and microstructure of heavily cold worked CuNb composites

Spitzig, W.A.; Pelton, Alan R.; Laabs, F. C.

doi:10.1016/0001-6160(87)90140-4

Cited by 292 publications

(138 citation statements)

References 18 publications

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“…The second elements (Ag or Pt) are initially present as roughly equiaxed powder particles ~5 μm in diameter, but the extensive deformation that occurs during wire drawing reshapes them to filaments that are 30 to 100 nm in diameter and 16 to 180 mm in length. The small filament diameter confers high strength on the composite (14,15).…”

Section: Microstructure and Physical Property Relationsmentioning

confidence: 99%

Kinetic transformation of nanofilamentary au Metal-Metal Composites

Wongpreedee

Russell

2004

Gold Bull

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Recovery and recrystallization of Au wire can degrade strength and alter conductivity properties during exposure to elevated temperature. Au Deformation Processed Metal-Metal Composites (Au DMMC's) are being developed for electronic applications requiring high conductivity and high strength. This paper discusses the relationships between microstructure, strength, and resistivity of Au DMMC's. Au DMMC samples were prepared by a powder metallurgy technique and processed into wire down to diameters as low as 120 μm. The extensive deformation reshaped the initially equi-axed powder into filaments that are 30 to 100 nm in diameter and 16 to 180 mm in length, which confers high strength. The high conductivity can be explained by electrons flowing parallel to the filamentary microstructure aligned with the wire axis. Au DMMC's were found to have good thermal stability compared to conventional cold-worked Au interconnection wires. Although these composites will revert to solid solutions if exposed to high temperatures for prolonged times, their relative stability is sufficient to allow them to maintain their two-phase microstructure during the anticipated lifetime temperature profiles of many products.

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Section: Microstructure and Physical Property Relationsmentioning

confidence: 99%

Kinetic transformation of nanofilamentary au Metal-Metal Composites

Wongpreedee

Russell

2004

Gold Bull

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“…Since both Cu and Ag phases belong to the face centered cubic (FCC) phase, and they have a cube-on-cube orientation relationship, the two phases could keep an almost synchronous codeformation during cold drawing. However, the codeformation of the Cu-body centered cubic (BCC) (Cu-Nb, Cu-Cr, or Cu-Fe) system is very complicated (Spitzig et al, 1987;Biselli and Morris, 1996;Sinclair et al, 1999). The BCC phase has a different dislocation slip system in association with a Cu matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Some general criteria for the co-deformation of FCC-BCC alloys were stated by Sinclair et al (1999), including the resolved shear stress, the angle between the incident and activated systems, and the resulting configuration at the phase interface. The original Nb dendrites in Cu-Nb alloys always have a scale of tens of micrometers (Spitzig et al, 1987). The Nb dendrites gradually evolved into Nb ribbons with a scale of nanometers at high drawing strains.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and properties of cold drawing Cu-2.5% Fe-0.2% Cr and Cu-6% Fe alloys

Bao

Chen

et al. 2015

J. Zhejiang Univ. Sci. A

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High strength and high conductivity Cu-based materials are key requirements in high-speed railway and high-field magnet systems. Cu-Fe alloys represent one of the most promising candidates due to the cheapness of Fe compared to Cu-Ag and Cu-Nb alloys. The high strength of Cu-Fe alloys primarily relies on the high density of the Cu/Fe phase interface, which is controlled by the co-deformation of the Cu matrix and Fe phase. In this study, our main attention was focused on the deformation behavior of the Fe phase using different scales. Cu-2.5% Fe-0.2% Cr (in weight) and Cu-6% Fe alloys were cast, annealed, and cold drawn into wires to investigate their microstructure and properties evolution. Cu-6% Fe contains Cu matrix and Fe, which become the primary particles in the micrometer scale after solution treatment. Cu-2.5% Fe-0.2% Cr contains Cu matrix and Fe precipitate particles in a nanometer scale after solution and aging treatment. The Fe primary particles were elongated and evolved into ribbons in a nanometer scale while the Fe precipitate particles were hardly deformed even at a drawing strain of 6. The reason for the unchanging characteristics of Fe precipitate particles is due to the size effect and incoherent phase interface of Cu matrix and Fe precipitate particles. The strength of both Cu-6% Fe and Cu-2.5% Fe-0.2% Cr alloys increases with the increase in the drawing strain. The electrical resistivity of Cu-6% Fe gradually increases and that of Cu-2.5% Fe-0.2% Cr keeps almost constant with the increase in the drawing strain.

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“…The mechanical properties of fine scale microstructures such as nanocrystalline materials [l], structures produced by wire drawing of metal-metal composites [2,3] and multilayered thin films processed by sputtering or evaporation [4-61, have been the subject of many recent investigations. In addition to the numerous potential applications of these materials such as wear resistant multilayered nitride coatings [5], and high strength and high electrical conductivity composite wires like Cu-Nb [2] and Cu-Cr [3], there is a fundamental interest in understanding the deformation and fracture behavior of such materials [7].…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the numerous potential applications of these materials such as wear resistant multilayered nitride coatings [5], and high strength and high electrical conductivity composite wires like Cu-Nb [2] and Cu-Cr [3], there is a fundamental interest in understanding the deformation and fracture behavior of such materials [7]. These fine scale composite materials typically exhibit strength levels significantly higher than what would be expected by a rule-of-mixtures prediction, and often the flow stresses at room temperature can approach 112 to 113 of the theoretical strength of the order of GI30 where G is the shear modulus [7].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Mechanical Properties of Sputtered Cu/Cr Multilayers

et al. 1997

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The microstructures and mechanical properties of Cu/Cr multilayers prepared by sputtering onto (100) Si substrates at room temperature are presented. The films exhibit columnar grain microstructures with nanoscale grain sizes. The interfaces are planar and abrupt with no intermixing, as expected from the phase diagram. The multilayers tend to adopt a KurdjumovSachs (KS) orientation relationship: ( 110)Cr // ( 11 1 )Cu, 4 1 b C r // <1 lO>Cu. The hardness of the multilayered structures, as measured by nanoindentation, increase with decreasing layer thickness for layer thicknesses ranging from 200 nm to 50 nm, whereas for lower thicknesses the hardness of the multilayers is independent of the layer thickness. Dislocation-based models are used to interpret the variation of hardness with layer periodicity. The possible effects of factors such as grain size within the layers, density and composition of films and residual stress in the multilayers are highlighted. Comparisons are made to the mechanical properties of sputtered polycrystalline Cu/Nb multilayers which, like Cu/Cr, exhibit sharp f c c h c interfaces with no intermixing and a KS orientation relationship, but have a small shear modulus mismatch.

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Characterization of the strength and microstructure of heavily cold worked CuNb composites

Cited by 292 publications

References 18 publications

Kinetic transformation of nanofilamentary au Metal-Metal Composites

Kinetic transformation of nanofilamentary au Metal-Metal Composites

Microstructure and properties of cold drawing Cu-2.5% Fe-0.2% Cr and Cu-6% Fe alloys

Microstructures and Mechanical Properties of Sputtered Cu/Cr Multilayers

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