Abstract
The mechanical anisotropic properties of Ti, Zr and Zircaloy-2 sheets have been measured under a uniaxial stress condition in the temperature range −196 to 300°C. The results obtained may be summarized as follows:
(1) The planar anisotropy of the proof stress and the flow stress at a small strain could be explained in consideration of the Schmid Factor. The invalidity of the Schmid Factor at large strain is due to anisotropy of work hardening.
(2) The n value and the uniform elongation of the specimen cut parallel to the rolling direction are always larger than those of the specimen cut parallel to the transverse direction, except in the case of Zr at −196°C. But the reduction of width at the point of fracture behaves conversely.
(3) It seems that the occurrence of deformation twinning at −196°C leads to the highest valve of uniform elongation and n value in Ti sheets under the condition tested, and also to the linear relation between stress and strain.
