Abstract
Three distinct initial microstructures, including the coarse grains (Al0 sample), fine grains (Al0-T sample) and fine grains with particles (Al0.3-TA sample), are prepared to investigate the deformation substructure development in AlxCoCrFeNi (X = 0, 0.3) high entropy alloy under the different influencing factors (grain size, strain temperature, strain level and particle). Results suggest slip dislocation is recognized in all deformed samples under the different strain conditions, while the strain temperature and the strain level are the critical factors for producing deformation twins for Al0 sample and Al0.3-TA sample, respectively. The effect of slip dislocation on deformation substructure development in Al0 sample is investigated via analyzing how orientation spread builds up inside the grains, confirming three different kinds of dislocation induced deformation patterns. The main difference between annealing twins and deformation twins are systematically investigated, revealing the different morphological features and the different number of activated twin variants.
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