Micro-structural relationships of heavily deformed gold-silver and gold-platinum composites
Date
1999
Authors
Gantovnik, Vladmir B.
Major Professor
Advisor
Russell, Alan M.
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Abstract
Au-Ag and Au-Pt composites were deformation processed by swaging and subsequent wire drawing. Four compositions, Au-7vol.%Ag, Au-14vol.%Ag, Au-7vol.%Pt, Au-14vol.Pt, were investigated. After extensive cold reduction, the particles of the second phase were reduced in size and aligned parallel to the wire axis. The second phase particles changed their shape from the initially equi-axed powder particles to elongated filaments. The classic convoluted ribbon shape of the second phase was not seen in these deformation-processed metal metal composites, DMMC'S. Instead, second phase filaments had an approximately cylindrical shape. The strength of the Au-X DMMC increased as the second phase spacing and filament size decreased. The Au-7%Ag DMMC wire had an ultimate tensile strength of 580 MPa and an electrical resistivity of 2.42 [Mu]Ohm-cm at a deformation processingtrue strain of 6.5. The Au-7%Pt DMMC wire had an ultimate tensile strength of 570 MPa and an electrical resistivity of 2.52 [Mu]Ohm-cm. Compared to commercial gold alloy, the ratio of ultimate tensile strength to electrical resistivity ([Sigma/Rho) of Au-X DMMCs is high.
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thesis