|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||Continuum Scale Approach to Characterization and Modeling of Deformation Mechanisms in Haynes 244 Alloy
||Thomas Mann, Michael Fahrmann, Marisol Koslowski, Michael Titus
|On-Site Speaker (Planned)
A recently developed high strength, low CTE, Ni-based superalloy, HAYNES® 244®, is strengthened through the distribution of a novel intermetallic phase, the γ´´´-Immm Ni2(Cr, Mo, W) phase. The presence of this phase enables complex deformation mechanisms over orders of magnitude of strain rates. From quasi-static tensile deformation to creep deformation, deformation twinning is observed to be the dominant mechanism. The origin of this deformation twinning mechanisms stems from the complex GSFE of the low symmetry body centered orthorhombic structure. By modeling the energetics of dislocation interaction using Density Functional Theory, incorporating these energies in mesoscale Phase Field Dislocation Dynamics modeling, and comparing to experimentally observed deformed microstructures, the complex deformation pathway can be elucidated. These techniques combine computational simulations and experimental validation through HR-(S)TEM and EBSD quantification. These techniques represent a continuum scale of modeling and characterization for determining unique deformation in novel alloys.
||Characterization, High-Temperature Materials, Modeling and Simulation