Explaining absence of texture development in cold rolled two-phase Zr-2.5 wt% Nb alloy

Kiran Kumar, M. ; Samajdar, I. ; Venkatramani, N. ; Dey, G. K. ; Tewari, R. ; Srivastava, D. ; Banerjee, S. (2003) Explaining absence of texture development in cold rolled two-phase Zr-2.5 wt% Nb alloy Acta Materialia, 51 (3). pp. 625-640. ISSN 1359-6454

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S13596...

Related URL: http://dx.doi.org/10.1016/S1359-6454(02)00442-1


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, Widmanstatten 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.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Zirconium; Texture; Microtexture; Cold Deformation; Texture Modeling; Microstructure; Two-phase
ID Code:9644
Deposited On:02 Nov 2010 11:35
Last Modified:14 May 2011 06:40

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