In this study, the deformation behavior of zircaloy was studied via in-situ electron backscatter diffraction observations. A Zr alloy containing heterogeneous grains with a 1:1 low- and large-angle grain boundary ratio that exhibited excellent mechanical properties was examined. The heterogeneous grains and a high fraction of LAGBs are the main reasons for improving work hardening ability and ductility. During the in-situ tensile test, non-basal dislocation slip systems were the main deformation mechanism. The presence of GNDs and KAM distributed within fine grains requires that Zr alloy overcome greater dislocation resistance to undergo plastic deformation when subjected to external forces, increasing the material’s YS and UTS. The non-basal dislocation slips are the main mode of deformation. Some 2nd pyr. 〈c + a〉 slip systems even with relatively low Schmid factor were activated for the coordination of uniform plastic deformation of multiple grains. Grain rotation facilitated collaborative deformation, with the grain orientation shifting from the basal to non-basal slip system as the strain increased. Therefore, the formability potential of Zr alloys can be improved and excellent mechanical properties can be achieved by introducing heterogeneous grain structures and a high fraction of LAGBs, which is crucial for improving the rolling/punching procedures used in the manufacturing of nuclear reactor structural components.
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