Proof stress measurement of die-cast magnesium alloys

•The applicability of the standardized proof stress determination methods to die-cast magnesium alloys is evaluated•The widely used 0.2% offset method is shown to underestimate the proof stress for die-cast magnesium alloys•The appropriate offset strain corresponding to 0.2% permanent plastic strain is determined for a range of magnesium alloys•A higher offset strain is shown to have an advantage in reproducibility of proof stress measurement for magnesium alloys