|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Microstructural Templates Consisting of Isostructural Ordered Precipitate / Disordered Matrix Combinations: Microstructural Evolution and Properties
||High Temperature Deformation Pathways in Ordered L12- and Immm-based Compounds
||Thomas Mann, Dongsheng Wen, Sae Matsunaga, Marisol Koslowski, Michael G. Fahrmann, Michael S. Titus
|On-Site Speaker (Planned)
||Michael S. Titus
Ordered intermetallic compounds exhibit complex deformation pathways that depend on their thermo-physical properties. In this presentation, we will first elucidate the role of symmetry and planar defect energies on the theoretical shear strength of γ’’’-Immm Ni2(Cr,Mo,W) precipitates in HAYNES® 244®. We have found that both low- and high-energy deformation pathways exist in the γ’’’ phase utilizing first-principles calculations, a continuum Peierls-Nabarro model, and phase field dislocation dynamics. Preliminary experimental evidence of deformation at elevated temperature suggests that microtwinning is enabled by the energetic disparity in these pathways. Next, we will report on recent efforts to predict and quantify solute segregation in γ’-strengthened NiCo-based alloys using a combination of first-principles calculations and high-resolution transmission electron microscopy. We have observed that segregated stacking fault energies in NiCo-based alloys can be significantly reduced when Co partitions to the stacking faults. The effects on mechanical properties resulting from solute segregation will be further discussed.