Di Xie¹, Zongyang Lyu¹, Ke An², Yan Chen², Peter K. Liaw¹, Yanfei Gao¹; ¹the University of Tennessee, ²Oak Ridge National Laboratory

The accelerated adoption of magnesium alloys as structural components in the automobile and aerospace industry is driven by their unique properties. However, very limited works have been done for the plasticity and fatigue mechanisms of magnesium alloys. The alternate twinning and detwinning behavior in a precipitation-strengthened magnesium alloy was investigated using in situ neutron diffraction during the cyclic deformation along the extrusion direction at constant strain amplitude of +/-1% at room temperature. The connection between the macroscopic behavior and the microscopic response during cyclic deformation at the grain level was established. Meanwhile, the effect of precipitates on the fatigue behavior of magnesium alloy using in situ neutron diffraction method has been studied, which may have profound guiding significance for the application and design of next-generation structural materials.