Abstract:

The microstructures of the as-rolled magnesium alloy subjected to dynamic plastic deformation along the rolling direction have been investigated. Mostly one {1012} twin variant or a twin variant pair is activated in a grain, leading to a parallel {1012} twin lamellar structure. At the stage of twinning-dominated deformation (ε < w8%), lamellar thickness decreases significantly with strain, from 5.55 to 2.49 mm. The evolution of lamellar thickness during deformation is directly related to {1012} twin activity. When plastic strain is greater than w8%, the twin lamellar structure disappears because the volume fraction of twins almost saturates at a value of ~90%.

Key words: Magnesium alloy, {1012} twin lamella, Lamellar thickness, Strain