Creep and superplasticity were investigated by testing in tension a fine-grained extruded Mg–Zn–Zr Mg alloy in the temperature range 100–300°C. Analysis of the experimental data suggests that grain boundary sliding becomes the dominating mechanism at 200 °C, leading to a true superplastic behaviour. By contrast, for lower temperatures, the straining process is controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was used to describe the dependence of strain rate on the applied stress.
Enhanced plasticity and creep in an extruded Mg–Zn–Zr alloy / Spigarelli, Stefano; EL MEHTEDI, Mohamad; Regev, M.. - In: SCRIPTA MATERIALIA. - ISSN 1359-6462. - 63:(2010), pp. 617-620. [10.1016/j.scriptamat.2010.05.044]
Enhanced plasticity and creep in an extruded Mg–Zn–Zr alloy
SPIGARELLI, Stefano;EL MEHTEDI, Mohamad;
2010-01-01
Abstract
Creep and superplasticity were investigated by testing in tension a fine-grained extruded Mg–Zn–Zr Mg alloy in the temperature range 100–300°C. Analysis of the experimental data suggests that grain boundary sliding becomes the dominating mechanism at 200 °C, leading to a true superplastic behaviour. By contrast, for lower temperatures, the straining process is controlled by dislocation climb. A comprehensive model, taking into account the simultaneous operation of the different mechanisms, was used to describe the dependence of strain rate on the applied stress.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
