|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Modeling and Validation on Role of Stoichiometry on Degradation in Ni-Cr Alloys for Nuclear Applications
||Fei Teng, Kevin Field, Benjamin Spencer, Octav Ciuca, Grace Burke, Emmanuelle Marquis, Li-Jen Yu, Leland Barnard, Julie Tucker
|On-Site Speaker (Planned)
Mechanical property degradation due to isothermal aging is of potential concern for alloys based on the Ni-Cr binary system (e.g., Alloys 625 and 690), particularly in nuclear power applications. The disorder-order transformation, which is the primary source of embrittlement, has been studied in Ni-Cr alloys by a combined experimental and computational approach due to sluggish behavior. Model alloys with different stoichiometries have been aged up to 10,000 hours and characterized via nanoindentation, atom probe tomography, small angle neutron scattering, and transmission electron microscopy. Experimental measurements in hardness and phase fraction as a function of aging time and temperature are discussed in order to assess model accuracy. Kinetic and Grand Canonical Monte Carlo simulations, based upon density functional theory calculations, are used to study thermodynamic and kinetic aspects of ordering transformation. A corresponding model is being built in Multiphysics Object-Oriented Simulation Environment in a method of crystal plasticity for lifetime predictions.
||Planned: Supplemental Proceedings volume