| Abstract Scope |
Extended defects in crystalline solids such as dislocations, stacking faults, homo-phase and hetero-phase interfaces may cause atomic structure rearrangement and solute re-distribution, creating new phase equilibria and phase transformations not seen in the bulk. For stacking faults and twin boundaries, because of the change in stacking sequences, structurally new phases already exist at these defects, which could be stable, metastable, or unstable in the bulk forms. If unstable, the new phases will be confined at the cores of these defects, a phenomenon called localized phase transformation (LPT). In this presentation, we show that by using a combination of experimental characterization, crystallographic analysis, ab initio calculations, thermodynamic modeling, and phase field simulations, one can predict (a) the structures of, (b) solute segregation and segregation transition at, (c) phase transformation and LPT at these extended defects, and (d) impact of LPTs on deformation pathway and mechanical properties. |