Dislocation-Dragging Effects in Quenched and Electron-Irradiated Copper

Abstract

Damping and modulus measurements were made on high-purity copper subjected to both quenching and 1.0-MeV electron irradiation. During isothermal annealing at room temperature, following quenching from 700°C, we observe a monotonic decrease in the logarithmic decrement with a concurrent increase in the modulus. However, both slow cooling and quenching of the sample followed by 1.0-MeV electron irradiation give rise to a substantial increase in the decrement; i.e., the Simpson-Sosin "peaking effect" is clearly evident.