Mechanism of Strain Hardening Of Magnesium Single-Crystals: Discrete Dislocation Dynamics Simulations

Poor ductility heavily limits the industrial application of magnesium (Mg) alloys, and pyramidal dislocations are an important deformation mode for enhancement. In this work, discrete dislocation dynamics (DDD) simulations were performed to study mechanical behavior evolution Mg singlecrystals compressed along c-axis. Especially, basal-transition cross-slip algorithms proposed introduced in DDD method. Simulation results show that basaltransition is mechanism strong strain hardening observed during c-axis compression single-crystals. Since events thermally activated, increasing temperature leads a high rate. During deformation, on first-order planes mostly cross slip onto second-order few transited basal planes, while directly. addition, reason formation loops steps experiments. The current work provides new mechanisms dislocations, which significant understanding behaviors enhancement alloys.