Creep behavior and threshold stress of an extruded Al–6Mg–2Sc–1Zr alloy

Creep experiments were performed on extruded Al–6Mg–2Sc–1Zr (wt.%) alloy in a temperature range of 423–533 K. A threshold type creep behavior was measured and explained by observed dislocation-particle interactions. The experimental threshold stress values at various temperatures were compared with existing theoretical models. None of the available models could account for the decrease in threshold creep strength with increasing temperature.