Abstract
The Orientations of single crystals of Al-Cu alloy were determined by Laue and Stereographic projection method. The distortion caused by tension for these specimens were studied. The relation between N′ (the numbers of slip bands per unit length on the normal to the slip plane in No./mm) and S (the resistance on the slip plane to the direction of slip in kg/sq mm) in single crystals of Al had already been reported by K. Yamaguchi that N′ was proportional to S. In single crystals of Al-Cu Alloy this rule holds good in the later stage of distortion. The orientations of crystals are defined by the angle θ (between the axis of specimen and the normal to the slip plane) and \varphi (between the direction of slip and the projection of the specimen on the slip plane.)
As to the relation between θ and Sc (critical shearing stress) Sc is minimum when θ=45°, and it is inclined to increase with the deviation from 45°.
Accordingly, the relation between S and s (shearing strain) depends on the orientation of crystals.
