Dynamic Strain Ageing During Stress Relaxation in Selected Magnesium Alloys Containing Rare earth Elements

Three magnesium alloys containing rare earth were deformed at room temperature and above room temperature at various strain rates. Stress relaxation tests were performed in order to study dynamic strain ageing phenomena effects. Different manifestations of strain ageing were observed. Non‐monotonous temperature and strain rate dependence of the flow stress were observed. Post relaxation effect, i.e. an increase of the flow stress at the beginning of plastic deformation after stress relaxation in comparison to the flow stress at the beginning of stress relaxation, was detected.