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Texture evolution and ultrafine grain formation in cross-cryo-rolled zircaloy-2
, Goel S., Singh I.V., Dey G.K., Saibaba N., D. Srivastava
Published in Chinese Society for Metals
2015
Volume: 28
   
Issue: 7
Pages: 837 - 846
Abstract
The texture and mechanical properties of cross-rolled zircaloy-2 at 77 and 300 K were investigated. Crossrolling 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.
About the journal
JournalActa Metallurgica Sinica (English Letters)
PublisherChinese Society for Metals
ISSN10067191
Open AccessNo