b'Microstructure-Based Benchmarking for Nano/MicroscaleTension and Ductility Testing of Irradiated SteelsPrincipal Investigator: Janelle P. Wharry (Purdue University)Team Members/ Collaborator: Anter El-Azab (Purdue University), Maxim Gussev (Oak Ridge National Laboratory)macro-scale tests, from which we will suggest standard practices. We focus on FeCrAl alloys and use the irradiated microstructure to inform finite element and dislocation dynamics models, which are then used to respectively design and interpret the macro-scale and nano/micro-scale tensile and ductility tests. Achieving consistent deformation mechanisms will enable establish-ment of standard practices for nano/micro-mechanical testing.Project Description:This project carries out microstruc-ture-based benchmarking. The only scientifically correct way to benchmark mechanical tests is to ensure that the nano/micro-scale Figure 1. Integration of differentT he objective of this studytests deform by the same mecha-irradiation induced defects in discreteis to develop standardizednisms as do the macro-scale tests. dislocation dynamics simulations: (i)methods for nano/micro- As such, the most effective (and fluctuating composition fields showingcost- and time-efficient) method the composition of Cr along with glidescale tensile and ductility testing offor ensuring consistent deforma-dislocations, (b) irradiation inducedirradiated Fe-Cr steels. This project defects along with glide dislocations,is carrying out microstructure- tion mechanisms is to observe and (c) both composition fields andbased benchmarking to ensureplastic phenomena concurrent to irradiation induced loops along withmechanical loading, and to do so the glide dislocations which arethat the nano/micro-scale testsprecisely in the region where failure expected to change the mechanicaldeform by the same mechanisms behavior of the irradiated alloys as macro-scale tests. Transmissionwill occur. TEM in situ mechanical electron microscopic (TEM) in situtesting enables exactly this. It is also mechanical testing enables directespecially well-suited for ductility observation of plastic phenomenastudies, which rely on high-precision concurrent to mechanical loading,displacement measurements at in the region where failure willregular time intervals throughout occur. Coupling these experimentsthe testhere, the microstructure with multiscale models, we will(from TEM video) can itself serve identify the approaches that provideas displacement indicators. We are consistent deformation mechanismsconducting microstructure-based between the nano/micro-scale andbenchmarking by investigating key process parameters for TEM in 34 2022|AFC ACCOMPLISHMENTS'