(1) is in very good agreement with the constant strain rate tensile 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 super plastic. 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.