Transmutation and Accommodation Effects by Glide Twinning

El Kadiri, H., & Oppedal, A. L. (2009). Transmutation and Accommodation Effects by Glide Twinning. Magnesium Technology 2010. 2010 TMS Annual Meeting & Exhibition; Seattle, WA: TMS.

Magnesium is being intensively integrated in large mechanical structures for energy savings due to its favorable strength / stiffness to weight ratio. This industrial renaissance is reviving attention to the complex fundamentals of deformation twinning in metallic double-lattice structures. Significant advances were made to integrate deformation twinning in polycrystal plasticity simulations, but constitutive models are still unable to capture significant hardening mechanisms unique to deformation twinning identified and studied in the late 1950s through the 1970s. This spurs the need to recall and analyze major mechanisms relevant to hardening in double lattice metals. In this work, we emphasize the effect of parent dislocation ``transmutation'' upon their incorporation within a twin, and effects related to slip and kinking accommodations of twinning deformation. A model routine is formulated for these mechanisms within the framework of a dislocation-density based constitutive model put forward by Beyerlein and Tomé [2008].