A SETUP FOR UNIAXIAL COMPRESSION IN A STATIC MAGNETIC-FIELD

A uniaxial-compression setup (which utilizes a piezoelectric motor) fo r testing the microplasticity of crystals in a static magnetic field i s described. This setup enables the programmed loading of specimens by triangular and trapezoidal mechanical pulses of variable height with variable plateau and edge durations. The orientation of the magnetic i nduction relative to the dislocation lines can be changed in the same test. This enables the observation of the dislocation motion under the action of both the mechanical load-magnetic field combination and onl y the mechanical load. To measure the force, a piezoelectric sensor an d a bend strain gauge are used. The minimal set force, which is measur able, is 5 x 10(-2) N (5 g). The force is measured with an accuracy to within 10-12%. The available constant magnetic fields are in a range of 0-1.5 T. The results showing the effect of the shape of mechanical load pulse on the dislocation mobility in the magnetic field are prese nted.