Plastic Deformation of Foil Copper Crystals. I : Study of Work-Hardening Behavior

概要

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An investigation has been made of the plastic properties of recrystallized copper foil crystals (thickness down to 6.6μ). It has been found that the stress-strain curves of single crystals and cube-texture specimens thicker than 50μ consist of three stages similar to those of bulk crystals. The work-hardening rate in stage II decreases sensitively with decreasing specimen thickness. Cube-texture specimens thinner than about 10 microns do not show stage II deformation, but their work-hardening rates are very high when the tensile axis lies near the [001] direction. The work-hardening rate (stage II) in 50.8μ specimens is much lower for the [011] than for the [001] orientation. Slip lines on (100) surfaces of foil crystals tend to be clustered in the early stages of deformation. This clustering of slip lines becomes stronger with increasing strain for the [001] orientation. In contrast, for the [011] orientation the distribution of slip lines tends to be uniform. Zig-zag cross-slip lines develop in 6.6μ specimens of [001] orientation. Some speculations are made about the mechanism of work-hardening on the basis of possible dislocation interactions. It is suggested that the work-hardening rate in stage I is closely related to the formation frequency of sessile dislocations, and that stage II hardening is associated with long-range internal stresses.
東北大学の論文