Abstract
Single crystals of copper-10 at% aluminum alloy with tensile axes on the [111]–[212] line at an interval of 2° were deformed in the range between −195 and 800°C. Below 22°C the crystals with axes at 0° and 2° from [111] had lower flow stress than those with the neighbouring orientations in the later stage of deformation, due to an abrupt change of the deformation mechanism during deformation. At 200 and 400°C the work-hardening rate in the rapid hardening stage of the crystals having the axes between 4° and 8° from [111] monotonically increased with strain. From the observation of the change in the cross-sectional shape of the specimens, it was found that near the [111] axis the combination of the active slip systems varied very sensitively with the initial orientation, deformation temperature, and strain.
