Texture Evolution and Ultrafine Grain Formation in Cross-Cryo-Rolled Zircaloy-2
来源期刊：Acta Metallurgica Sinica2015年第7期
论文作者：D.Srivastava G.K.Dey
文章页码：837 - 846
摘 要：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,f11 "22g contraction twin and f10" 12 g extension twin were evident from the deformed microstructure at 77 K.The propensity for activation of basal slip \a[ at77 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.
D.Srivastava3，G.K.Dey3
3. Materials Science Division,Bhabha Atomic Research Center
摘 要：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,f11 "22g contraction twin and f10" 12 g extension twin were evident from the deformed microstructure at 77 K.The propensity for activation of basal slip \a[ at77 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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