b'Bridging Microscale to Macroscale Mechanical Property Measurements and Predication of Performance Limitation for FeCrAl Alloys Under Extreme Reactor ApplicationsPrincipal Investigator: Jian Wang (University of Nebraska-Lincoln)Team Members/ Collaborator: Dongyue Xie, Mingyu Gong, Bingqian Wei (University of Nebraska-Lincoln); Tianyi Sun, Jiangyuan Fan (Purdue University); Tianyao Wang (Texas A&M University / Xinghang Zhang (Purdue University), Lin Shao (Texas A&M University)M icroscale mechanicalfrom micro-scale measurements testing has greatly benefitedand characterizations of deformed nuclear materials studiesand/or high-dose irradiated in at least two aspects: one ismaterials into predictions of the its feasibility to integrate withmacro-scale mechanical properties scanning electron microscopy(especially for ductility) of irradiated (SEM) and transmission electronmaterials. Mechanical properties of microscopy (TEM) microscopes fora structural material are primarily in situ atomic scale or microscalecontrolled by the overall micro-structural characterization to revealstructure and the character and fundamental details, and the otherdistribution of microstructural is its significance in developmentdefects induced by deformation of accelerator-based ion irradiationand/or irradiation, all of which technique as a surrogate method tocan be observed and quantified simulate neutron damage. However,using microscopy. Combining limited ion penetration depths,micro-scale characterization of which are about a few microns formicrostructural defects and in-situ MeVs heavy ions and 10s micronsmicro-mechanical testing, we can for MeV light ions, make microscaleexplore the correlation of mechan-mechanical tests a necessity. But,ical properties with contributions there is a great challenge to bridgeof individual microstructural defect microscale tests to macroscale testsensembles. These correlations willbecause a bulk specimen of irradiatedenable us to develop the Mechanisms-nuclear materials for high dosebased Single Crystal Plasticity applications cannot be obtainedModel (MSCP) at the meso-scale. in laboratory. This project is facingImplementing the MSCP into the this inexorable challenge. We aimVisco-Plastic Self-Consistent (VPSC) to develop an integrated theoretical,model for polycrystalline aggregates, modeling, and experimental platformwe are able to describe the Consti-that enables predicting the ductilitytutive Law for Polycrystals (CLP) of nuclear structural materials basedat the micro-scale (texture and on microscale mechanical tests. the distribution of grain size are known). Comparing with the Project Description: results of various macro-mechanical To utilize micro-scale measure- tests we can validate the micro-scale ments for prediction of macro-scaleCLP. Lastly, we implement the CLP properties, there is a need tointo finite element analysis and transform the knowledge obtained 44 2022|AFC ACCOMPLISHMENTS'