Characteristics of Twin Lamellar Structure in Magnesium Alloy during Room Temperature Dynamic Plastic Deformation

The microstructures of the as-rolled magnesium alloy subjected to dynamic plastic deformation along the rolling direction have been investigated. Mostly one { 101-2} twin variant or a twin variant pair is activated in a grain, leading to a parallel {101-2} twin lamellar structure. At the stage of twinning-dominated deformation （ε 〈 -8%）, lamellar thickness decreases significantly with strain, from 5.55 to 2.49 pro. The evolution of lamellar thickness during deformation is directly related to {1012} twin activity. When plastic strain is greater than - 8%, the twin lamellar structure disappears because the volume fraction of twins almost saturates at a value of -90%.