Phase-field modelling of microstructure evolution in displacive transformations2023.11.15 14:18 - Katarzyna Kuźniar
Displacive transformations, like deformation twinning or martensitic transformation, are associated with microstructure evolution, which involves nucleation, propagation and annihilation of interfaces. For instance, the functional properties of shape-memory alloys (SMAs), notably the shape-memory effect and pseudoelasticity, result from the reversible martensitic phase transformation which, at the micro-scale, proceeds through formation and evolution of complex martensitic microstructures. Spatially-resolved modelling of the corresponding phenomena can be efficiently carried out using the diffuse-interface approach, and specifically using the phase-field method. In this talk, our recent related results will be summarized. Size effects, rate-independent dissipation, and microstructure evolution in pseudoelastic SMAs during nano-indentation will be discussed. A finite-strain phase-field model of deformation twinning coupled with crystal plasticity will also be discussed, including a new look at the kinematics of twinning.