|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
||Segregation-assisted Concentration Modulation within Grain Boundaries
||Longsheng Feng, Di Qiu, Kamal Kadirvel, Pengyang Zhao, Suliman Dregia, Yunzhi Wang
|On-Site Speaker (Planned)
Recent experimental observations found spinodal-like concentration modulation in grain boundary (GB) planes. We propose different pathways that could be responsible for achieving such concentration modulation within the GB, including those mediated by intrinsic heterogeneity of GB structures, some transient states during segregation transition at GBs, and two-step aging heat treatment. The intrinsic periodicity of GB structure is modeled by phase field simulations at nanometer scale, and the segregation pattern is calculated through a 3-dimensional segregation isotherm. The thermodynamics and kinetics of GB segregation and segregation transition are also studied through phase field simulations and the possibilities of true spinodal decomposition at GB are discussed. The work is supported by NSF DMREF program and AFOSR FA9550-20-1-0015.