Role of initial {1 0 −1 2} twin in the fatigue behavior of rolled Mg-3Al-1Zn alloy

Initial {1 0 −1 2} twin influenced the plastic deformation mechanism activated during fatigue deformation, especially during compressive loading, by enhancing the activity of the detwinning mechanism. With the aid of initial {1 0 −1 2} twin, compressive deformation could be fully accommodated by detwinning alone. This change in the predominant plastic deformation mechanism during compressive loading significantly decreased compressive flow stress, causing an increase in mean stress, and thus deteriorated the fatigue resistance of the material.