Publication at Faculty of Mathematics and Physics |
2010
Abstract
Selected magnesium alloys and composites were deformed at temperatures between room temperature and 300 °C at a constant strain rate. The testing temperature influences significantly the deformation behaviour of the materials.
The flow stress decreases with increasing temperature. The work hardening rate decreases with increasing stress (strain) and temperature.
Above 200 °C, a dynamic balance between hardening and softening is observed. Stress relaxation tests were performed to identify thermally activated dislocation motion.
The main thermally activated process is very probably the glide of dislocations in non basal planes. The internal component of the applied stress decreases significantly with increasing temperature.