|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Thermal and Mechanical Stability of Nanocrystalline Materials
||Phase Transformations and Phase Separation in Nanocrystalline Fe Alloys: Thermal Stability and Densification Behavior
||Dor Amram, Christopher A Schuh
|On-Site Speaker (Planned)
Recent successes in stabilizing single-phase nanocrystalline (NC) Fe alloys by grain boundary segregation are extended in this work with the aim of studying thermal stability across phase transformations, and stabilizing dual phase NC alloys. With a nanoscale structure and multiple coexisting phases, possibilities of additional strengthening, toughening, creep resistance, and processability—such as densification behavior when processed through a powder route—are all worthy of exploration. Here we study the effect of the allotropic α↔γ transformation and of phase separation on thermal stability of binary and ternary NC Fe alloys. The evolution of phases and grain sizes are tracked by in-situ x-ray diffraction during annealing, and characterized by electron microscopy and atom probe tomography with an emphasis on interface chemistry. These details point to a heat treatment schedule that may achieve a fully dense, dual-phase NC alloy.
||Planned: Supplemental Proceedings volume