The effect on structure and properties of an Al–Mg–Mn alloy caused by varying the extrusion parameters over a wide range of temperature-compensated strain rate was investigated. It was determined that subgrains exist in the extrudate structure under all processing conditions, but the structure contained recrystallized grains if the extrusion temperature was above 673K. Although the subgrain size varied linearly with temperature-compensated strain rate the properties did not. It was not possible to determine a simple relationship between properties and the temperature-compensated strain rate, but it was found that they do vary considerably with processing conditions and appear to be strain dependent.
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