Superplastic Behaviour of AZ61-F Magnesium Composite Materials

Deformation of AZ61-F magnesium alloys with 1 wt% of Al2O3 phase was tested at different temperatures and different strain rates. It was shown that at temperatures 473-523 K and the highest strain rate applied from 1 x 10(-2) s(-1) to 1 x 10(-4) s(-1), a significant ductility growth was observed. The grain size of 0.6-0.8 mu m was reached by severe plastic deformations by means of equal channel angular pressing (ECAP). Secondary Mg17Al12 and Al2O3 phases were identified. Maximum strain was gained at temperature of 473 K and strain rate of 1 x 10(-4) s(-1).