Work-hardening of Copper Foil Crystals

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  • Sumino Koji
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Yamamoto Mikio
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

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Other Title
  • 銅薄膜結晶における加工硬化
  • ドウ ハクマク ケッショウ ニ オケル カコウ コウカ

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Description

An investigation was made on the plastic properties of recrystallized copper foils of thickness down to 6.6 microns. It was found that the stress-strain curves of the single crystal and pseudo-single crystal (crystal having the cube texture) specimens thicker than 50 microns consisted of three deformation stages quite similar to those of bulk single crystals and that the value of the work-hardening rate in the stage II deformation decreased very sensitively with decreasing specimen thickness. The pseudo-single crystal specimens thinner than 10 microns reveal no stage II deformation, but the work-hardening rate took a very high value as the tensile axis approaches to the [001] direction. The work-hardening rate of the well-developed stage II deformation in 50.8 microns thick specimens elongated in directions near [011] was much smaller than that observed in the specimens elongated in directions near [001]. Most of the slip lines observed on the surfaces of foil crystals were normally clustered in the early stage of deformation. This clustered distribution of slip lines became more marked with increasing strain when the tensile direction of the specimens was near [001]. On the other hand, when the specimens were elongated in the direction near [011], the distribution of slip lines tended to be uniform as the deformation became larger. The cross-slip lines of a zig-zag form was observed on 6.6 microns thick specimens elongated in the [001] direction. The work-hardening characteristics of copper foil crystals were discussed in terms of the possible types of interactions between dislocations operating during deformaton. It is suggested that the work-hardening rate in the stage I deformation is closely related to the frequency of occurence of the sessile reaction between dislocations and that the origin of the stage II deformation is the complicated configuration of dislocations induced by large stress field around dislocation groups piled up against the sessile dislocation.

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