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Abstract
The hot-working characteristics of six aluminium alloys were investigated and the constants in the relevant equations evaluated. Contrary to previously published work the results do not immediately satisfy the Zener-Hollomon relationship. A correction factor must be appliedfor differing die geometries and it is suggested that this is due to inaccuracies in calculation of strain rate and temperature as well as the definition of Z usually employed. The relevance of the hot-working constants are discussed and the effect of alloying constituents on product structure investigated.