Orientation Dependence of Work Herdening of Copper Single Crystals near the [111] Axis

Abstract

Copper single crystals with the tensile axes on the [111]–[212] line at an interval of 2 degrees were deformed in the range between −195°C and 800°C. The load-elongation curves varied continuously with the deviation angle from the [111] axis at all temperatures. The maximum work-hardening rate decreased with the angle from the [111] axis in the range within 10 degrees below 600°C. The active slip systems were estimated from the changes in the cross-sectional shapes of the specimens after deformation. The orientation dependence of the work-hardening rate near the [111] axis was explained by the cooperation of the two types of deformation mechanisms, i.e. the [121]- and the [212]-types.