|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Microstructural Templates Consisting of Isostructural Ordered Precipitate / Disordered Matrix Combinations: Microstructural Evolution and Properties
||Free Energy Landscape, Transformation Pathway and Alloy Parameters Leading to Various Isostructural Ordered Precipitate Microstructures
||Kamalnath Kadirvel, Shalini Roy Koneru, Rajarshi Banerjee, Hamish L. Fraser, Yunzhi Wang
|On-Site Speaker (Planned)
Order-disorder transformations may occur by nucleation and growth of the ordered phase from an disordered matrix (typical first-order transition); congruent ordering followed by either decomposition or spinodal decomposition of the ordered phase, and disordering again of one of the two ordered phases in the latter; spinodal decomposition in the disordered phase followed by congruent ordering of one of the disordered phases, etc. In this presentation, we explore microstructural evolution along these transformation pathways by phase field simulations using corresponding free energy landscapes and study the effects of asymmetry of a miscibility gap, alloy composition, lattice mismatch and elastic modulus mismatch among the ordered and disordered phases, and heat treatment on the final two-phase or multi-phase microstructures. Order-disorder reactions of both the first and second kinds will be considered. The simulation results offer insights on possible transformations pathways leading to the microstructures observed in multi-principle element alloys explored recently by experiments.