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Title: Role of shear localization in nanocrystallisation of zircaloy-2 processed by wire rolling at cryo temperature
Authors: Goel S.
Kumar N.
Jayaganthan R.
Singh, Indra Vir
Srivastava D.
Published in: Materials Science and Engineering A
Abstract: Shear localization during wire rolling of zircaloy-2 at cryo temperature has been investigated in the present work. Bulk nanocrystalline zircaloy-2 has been obtained by optimized annealing of cryorolled alloy. Microstuctural characterization and mechanical behavior of the processed alloy have been performed by X-ray diffraction (XRD), optical microscopy, Electron backscatter diffraction (EBSD), Transmission electron microscopy (TEM) and tensile testing. The presence of (ω) phase after wire rolling has been observed from XRD. The tensile strength of deformed zircaloy-2 (true strain = 2.77) was found to be 1015 MPa with a uniform ductility of 10.8%, while loss of tensile strength (837 MPa) and increase in ductility (14.8%) after annealing at 400 °C for 30 min were observed. Nanocrystalline structure with an average grain size of 30 nm has been formed after annealing at 400 °C for 10 min. The microstructure reveals the formation of shear bands during wire rolling at cryo temperature due to large applied strain in each pass. The possible mechanism of deformation and shear band formation has been discussed. The effect of strain rate on amount of work converted to heat (β) during shear band formation has been discussed. The calculation reveals that the rise in temperature during deformation was 831.6 °K on applying a strain of 2.77, during wire rolling at cryo temperature. © 2018 Elsevier B.V.
Citation: Materials Science and Engineering A (2018), 718(): 111-122
Issue Date: 2018
Publisher: Elsevier Ltd
Keywords: Nanocrystalline
Shear localization
Wire rolling
ISSN: 9215093
Author Scopus IDs: 57206032668
Author Affiliations: Goel, S., Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, No.200, Xiaolingwei, 210094, China
Kumar, N., Department of Mechanical Engineering, Howard University, Washington, D.C, 20059, United States
Jayaganthan, R., Department of Metallurgical and Materials Engineering & Centre of Nanotechnology, IIT Roorkee, Roorkee, 247667, India, Department of Engineering Design Indian Institute of Technology Madras, Chennai, 600036, India
Singh, I.V., Department of Mechanical and Industrial Engineering, IIT Roorkee, Roorkee, 247667, India
Srivastava, D., Materials Science Division, Bhabha Atomic Research Center, Mumbai, 40085, India
Funding Details: Authors, Dr. R. Jayaganthan and Dr. Sunkulp Goel expresses their sincere thanks to Board of Research and Nuclear Science (BRNS), Bombay ( BRN-577-MMD ) for their financial grant to this work and Prof. Jing Tao Wang, Herbert Gleiter institute of Nanoscience, Nanjing university of Science and Technology, China for his valuable suggestions to this work.
Corresponding Author: Goel, S.; Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, No.200, China; email:
Appears in Collections:Journal Publications [ME]

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