Abstract
As a practical material for use as the anode cases of button-type batteries, we have studied clad metals consisting of Cu/18Cr-8Ni-Fe(SUS304)/Ni, and shown the possibility of improvement in strength and anisotropy by annealing and cold rolling. From the comparison of the clad metals and SUS304 plates about texture or r-values, we have obtained the following results:
(1) The clad metals showed higher strength and formability, by 25% cold rolling after annealing. Tensile strength increased from 657 MPa to 862 MPa, and the Δr-values reduced from 0.25 to 0.08. This is because the texture of the 18Cr-8Ni-Fe core material in clad metal has a rather wide spread in orientation, when compared with that of the SUS304 plates, and the formation of Goss orientation {110}⟨001⟩ during cold rolling, which leads to a remarkable anisotropy, is largely suppressed.
(2) The in-plane anisotropy of r-values was calculated from an orientation distribution function based on the Taylor theory. It agreed well, qualitatively, with that of measured r-values in both of the clad metals and SUS304 plates.
(3) For the clad metals, the core material is deformed without direct contact with the rolls. Therefore, the characteristic texture formation in clad metal may be caused by the suppression of shear deformation.
