抄録
In order to elucidate the pressure dependence of the flow stress for hexagonal metals, the tensile tests were made under hydrostatic pressure up to 600MPa on polycrystalline cadmium sheets which were rolled at room temperature. The results obtained are summarized as follows.
(1) The rate of increase of flow stress Δσ/σ due to 600MPa increases with an increase of strain, and in every range of the strain it is considerably large in comparison with the rate of increase of shear modulus due to pressure. In the extension along the rolling direction Δσ/σ amounts to about 16%, and in the extension along the transverse direction to about 20%.
(2) Every specimen shows a remarkable yield point on the stress-strain relation. A Lüders' extension following the yield drop occurs mainly due to the activation of the basal slips.
