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Author(s) |
Goel, S.; Jayaganthan, R.; Singh, I. V.; Srivastava, D.; Dey, G. K.; Saibaba, N. (MSD)
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Source |
Acta Metallurgica Sinica, 2015. Vol. 28 (7): pp. 837-846 |
ABSTRACT
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The texture and mechanical properties of cross-rolled zircaloy-2 at 77 and 300 K were investigated. Cross-rolling at 77 K was performed to impart different thickness reductions of 25% and 50%, while at 300 K with 25%, 50%, 75% and 85% reductions to the sample. EBSD analysis of deformed sample showed that near-basal orientation is not deformed completely after 50% rolling reduction. The activation of prismatic silp, {1122} contraction twin and {1012} extension twin were evident from the deformed microstructure at 77 K. The propensity for activation of basal slip 〈a〉at 77 K was also observed. The deformation of the sample at 300 K occurs by prismatic, basal 〈a〉and pyramidal〈c+a〉slips, which were predicted by pole figures. After annealing, the tensile strengths (735 and 710 MPa) are almost the same for 50% cryo-cross-rolled and room-temperature cross-rolled zircaloy-2 with almost 2.7% difference in their ductility. KAM analysis of the deformed samples was made to estimate the stored strain energy and dislocation density. Annealing of deformed sample at 673 K for 30 min results in recrystallization, which leads to the formation of ultrafine grains. |
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