Vacancy-loss during quench in strained platinum and gold

Abstract

The increase in electrical resistivity in strained and annealed platinum and gold has been measured as a function of quench rate at 1/2 and 6 kbar. The data were analysed in terms of two free-dislocation models and a spherical-sink model (as an approximation to a sub-grain boundary). For strained platinum, the spherical-sink model gives a consistently superior fit, so that the dominant sinks are presumed to be sub-grain boundaries. These sink structures correlate reprodicibly with prequench strain and are stable at 1000°C for at least 3 hours.