Grain fragmentation and twinning in deformed zircaloy 2: response to positron lifetime measurements

Sahoo, S. K. ; Hiwarkar, V. D. ; Mani Krishna, K. V. ; Samajdar, I. ; Pant, P. ; Pujari, P. K. ; Dey, G. K. ; Srivastav, D. ; Tiwari, R. ; Banerjee, S. (2010) Grain fragmentation and twinning in deformed zircaloy 2: response to positron lifetime measurements Materials Science and Engineering: A - Structural Materials - Properties, Microstructure and Processing, 527 (6). pp. 1427-1435. ISSN 0921-5093

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09215...

Related URL: http://dx.doi.org/10.1016/j.msea.2009.10.066

Abstract

Microstructural developments in deformed Zircaloy 2 were studied using techniques ranging from positron annihilation spectroscopy (PAS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD). Grain fragmentation during plastic deformation, which is expected to involve dislocation realignment and recovery, showed a clear correlation with drop in mean PAS lifetime (τm). An increased τm, on the other hand, was associated with annihilation of deformation twins. The deformation twins,{101-2} {1-011} type tensile twins, were identified from axis-angle relationship: 94.8° {1-21-0}. A deviation of more than 5° from the exact twin orientation relationship was considered as annihilation. Such annihilation, caused by developments of in-grain misorientations, is expected to involve accommodation through interfacial dislocations. Presence of such dislocations, and associated point defects, offers an explanation for the observed increase in τm.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Positron; TEM; EBSD; Zirconium; Defect; Dislocation; Grain Fragmentation; Deformation Twinning
ID Code:9670
Deposited On:02 Nov 2010 11:12
Last Modified:14 May 2011 05:08

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