Effects of cold-rolling on the indentation hardness of copper
Journal of research of the National Bureau of Standards
Specimens of tough-pitch electrolytic copper, commercial oxygen-free copper, and single crystals of copper of different orientations, were subjected to severe cold-rolling to determine the effect on the properties, particularly on the hardness. In all cases the indentation hardness increased to a maximum value which was maintained during subsequent reduction until the hardness determinations became unreliable owing to the thinness of the specimens. No irregularities were encountered except in
... untered except in the case of very thin specimens. The results were confirmed by determinations of tensile strength of some of the specimens and by the application of Meyer's analysis to some of the data. The effect of severe coldrolling on the indentation hardness of copper was not materially affected by the initial thickness of the specimen, the presence or absence of 0.4 percent of oxygen, the change from polycrystalline to single crystal specimens, or the orientation of the single crystals with respect to the plane of deformation.