A goniometer for the measurement of stresses in single crystals and coarse-grained specimens

A psi-phi goniometer with two axes of rotation, driven by stepping motors, was designed as an attachment for a horizontal theta/2theta goniometer. By means of this arrangement it is possible to measure strains and compute stresses in single crystals and in separate crystals of a bicrystal or a coarse-grained polycrystalline specimen. The available rotations also make it possible to investigate residual macrostresses and textures in polycrystalline specimens. Results of the test measurements on a tensile specimen of a molybdenum single crystal are given. (Auth.)