Microstructure and anomalous mechanical properties of in situ-produced silver-copper composite wires

Frommeyer, G.; Wassermann, Günter

doi:10.1016/0001-6160(75)90144-3

Cited by 177 publications

(61 citation statements)

References 4 publications

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“…The 590 nm Ag filament thickness in the T)=5.6 Au-lOAg DMMC is much larger than the 10 to 20 nm filament thicknesses typically seen in DMMC's that have been deformed to higher true strains (1-4, 15), suggesting that the strength and hardness of this T)=5.6 Au-lOAg DMMC are probably well below the maximum values attainable in an Au-Ag DMMC. Of the DMMC's previously studied, the system most similar to the Au-lOAg DMMC is the eutectic Ag-Cu DMMC of Frommeyer and Wassermann, which had ultimate tensile strength of 1450 MPa at T)=9.2.…”

Section: Resultsmentioning

confidence: 71%

A new method for strengthening gold

Russell

Chumbley

et al. 1998

Gold Bull

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Metal-metal composites were first produced in a copper matrix in the 1970's, and they have since been produced in several other binary metal systems. This strengthening technique reinforces a ductile metal matrix with a ductile metal second phase. In some binary systems, this technique confers extraordinarily high strength and hardness while still maintaining low electrical resistivity. This article reports on the first gold matrix metal-metal composite, which was produced by deformation processing a 90%Au-l0%Ag powder compact. The Au-Ag specimen studied had an ultimate tensile strength of 550 MPa and an electrical resistivity only 8% higher than that of pure Au at a deformation processing true strain of 5.6. The 590 nm average Ag filament thickness in this composite was relatively coarse compared to other deformation processed composites, which suggests that substantially higher strengths would be possible in a gold matrix metal-metal composite using deformation processing to higher true strains to reduce the filament thickness. DEFORMATION PROCESSED METAL-METAL COMPOSITESDuring the past two decades, a new class of copperrefractory metal composites has been developed with extraordinary mechanical and electrical properties (1-3). These composites, composed of face-centered cubic Cu with 10 to 30% by volume element X (where X is a body-centered cubic metal immiscible in Cu, such as Nb, V, Ta, Cr, or Fe), are severely deformed by extrusion/swaging/wire drawing or by rolling to produce the nanometer-scale microstructure of X filaments in a Cu matrix shown in Figure 1. The Cu20%Nb system is the most thoroughly studied of these composites. These materials are best known for their extraordinary tensile strengths, which can be as high as 2400 MPa after deformation to a true strain (T) ) of 12 (4). However, they possess other unusual properties as well, including: strength-to-electrical-resistivity ratios much higher than those of any copper alloy the smallest filamentary microstructures (phase size) of any material available in bulk quantities phase structures with very low dislocation densities, approaching whisker quality in many cases The Cu-X deformation-processed metal metal £omposites (DMMC's) are characterized byremarkable ductility, which allows cast-or powder-processed 88 starting billets to be deformed as much as T) = 13.4 (5). Such deformations represent more than an 800-fold reduction in diameter and are accompanied by a concomitant reduction in the thickness and spacing of the X phase. Thus, an as-cast billet of Cu-20Nb, displaying Nb dendrites with an average thickness of

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Section: Resultsmentioning

confidence: 71%

A new method for strengthening gold

Russell

Chumbley

et al. 1998

Gold Bull

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“…This results in a higher driving force for formation of Al,Ti, so the intermetallic will form at a lower temperature as deformation increases. Previous investigations [32,34] show that at higher deformation, the amount of dislocations increase up to a certain fiber thickness. An increasing amount of dislocations will give a decrease in the formation start temperature also, since dislocations may act as additional nucleation sites for Al,Ti formation.…”

Section: Differential Thermal Analysismentioning

confidence: 88%

Microstructure-strength relationship of a deformation processed aluminum-titanium composite

Lund¹

1998

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“…The total drawing strain necessary to achieve strength level of lGpa was estimated by assuming a linear work hardening rate (about 130MPa) which was deduced from previous work [4] and verified for producing large cross-section wire [5]. A Cu-25wt%Ag billet of large diameter was hot forged at a temperature below 625 "C. The temperature of the hot forging operation was chosen in order to decrease the dendrite size of the cast materials, avoid excessive grain growth, and to allow adequate ductility for forging.…”

Section: Drawn Microscopic Compositesmentioning

confidence: 99%