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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/1493

Title: Explaining absence of texture development in cold rolled two-phase Zr–2.5 wt% Nb alloy
Authors: KIRAN KUMAR, M
SAMAJDAR, I
VENKATRAMANI, N
DEY, GK
TEWARI, R
SRIVASTAVA, D
BANERJEE, S
Keywords: aspect ratio
crystal orientation
grain boundaries
plastic flow
Issue Date: 2003
Publisher: Elsevier
Citation: Acta Materialia 51(3), 625-640
Abstract: In the present study, two distinct starting microstructures of Zr–2.5 wt% Nb have been used: (1) single-phase α hcp martensitic structure; and (2) two-phase, 10% bcc β and rest hcp α, Widmanstätten structure. In the second case, two types of α were present—near grain boundary predominantly single-phase α (about 5% of the total α) and α plates in an apparently continuous β matrix. Both (1) and (2) had similar starting crystallographic texture of the hcp α phase and were deformed by unidirectional and cross rolling. In the two-phase structure the changes in the bulk texture on cold rolling was found to be insignificant, while in the single-phase material noticeable textural changes were observed. Taylor type deformation texture models predicted textural changes in single-phase structure but failed to predict the observed lack of textural development in the two-phase material. Microtexture observations showed that α plates remained approximately single crystalline after cold rolling, while the β matrix underwent significant orientational changes. Relative hardening, estimated by X-ray peak broadening, was observed mainly in β phase; while aspect ratio of α plates remained unchanged with cold rolling—indicating absence of effective macroscopic strain in the hcp α plates. Based on microstructural and microtextural observations, a simple model is proposed in which the plastic flow is mainly confined to the β matrix within which the α plates are subjected to ‘in-plane rigid body rotation’. The model explains the observed lack of textural developments in the two-phase structure.
URI: 10.1016/j.jeurceramsoc.2006.05.083
http://hdl.handle.net/10054/1493
http://dspace.library.iitb.ac.in/xmlui/handle/10054/1493
ISSN: 0955-2219
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