(1) is in very good agreement with the constant strain rate ten- sile data until the strain is less than 0.6. At the higher strains this approximation deviates from measured values significantly.
The m values of Backofen equation are a bit lower than 0.3 and very close to each other (0.265 and 0.278). Thus, the flow type for this alloy could be treated as quasi-superplastic. These results agree with the ones found by Woo et al. (1997) for the similar alloys and temperatures. Such values of m are typical for the AMg6 alloy in as received condition.