Strengthening a dual-phase Mg-Li alloy by strain-induced phase transformation at room temperature

Strain-induced phase transformation in a dual-phase Mg-Li alloy after a severe deformation has been investigated. beta-Li phase was transformed into alpha-Mg phase as a consequence of large strain cold rolling. The morphology and density of the strain-induced phase could be controlled by slip activation in the beta-Li phase. A multi-direction rolling procedure was designed to enhance phase transformation behavior. High density strain-induced phase refined phase structure and greatly promoted the yield strength of the material without a sacrificing the ductility. Strain-induced phase transformation is a potential method for improving the mechanical properties in dual-phase alloys. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.