%0 journal article
%@ 0925-8388
%A Escobar, J., Gwalni, B., Olszta, M., Silverstein, J., Ajantiwalay, T., Overman, N., Fu, W., Li, Y., Bergmann, L., Maawad, E., Klusemann, B., dos Santos, J., Devaraj, A.

%D 2022
%J Journal of Alloys and Compounds

%P 167007 
%R doi:10.1016/j.jallcom.2022.167007
%T Heterogenous activation of dynamic recrystallization and twinning during friction stir processing of a Cu-4Nb alloy
%U https://doi.org/10.1016/j.jallcom.2022.167007
 
%X An interplay between high degree of shear deformation and deformation-induced heating occurs during friction stir processing (FSP) of metals. In medium-to-low stacking fault energy Cu alloys, this can lead to a complex spatially heterogenous activation of dynamic recrystallization (DRX) and twinning mechanisms. Within the Cu-Nb system, the presence of Nb is further expected to influence the DRX mechanism of the Cu matrix. However, the microstructural changes induced by the co-deformation of Nb during FSP are still not well understood. Therefore, this study uses a combination of multimodal microstructural characterization, solution thermodynamics-based predictions, and computational crystal plasticity simulation to reveal the various microstructural evolution mechanisms that can occur during FSP of a Cu-4at%Nb binary model alloy. The formation of softer DRX zones, and harder shear localization regions are revealed using electron backscatter diffraction, transmission electron microscopy, atom probe tomography, and crystal plasticity modeling.