DSpace
 

DSpace at IIT Bombay >
IITB Publications >
Article >

Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7352

Title: Grain fragmentation and twinning in deformed Zircaloy 2: Response to positron lifetime measurements
Authors: SAHOO, SK
HIWARKAR, VD
KRISHNA, KVM
SAMAJDAR, I
PANT, P
PUJARI, PK
DEY, GK
SRIVASTAV, D
TIWARI, R
BANERJEE, S
Keywords: energy dislocation-structures
annihilation techniques
plastic-deformation
defects
plane
microstructures
spectroscopy
orientation
boundaries
evolution
Issue Date: 2010
Publisher: ELSEVIER SCIENCE SA
Citation: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 527(6), 1427-1435
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 (tau(m)). An increased tau(m), on the other hand, was associated with annihilation of deformation twins. The deformation twins, (1 0 (1) over bar 2)<(1) over bar 0 1 1 > type tensile twins, were identified from axis-angle relationship: 94.8 degrees ((1) over bar 2 (1) over bar 0). A deviation of more than 5 degrees 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 tau(m). (C) 2009
URI: http://dx.doi.org/10.1016/j.msea.2009.10.066
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7352
http://hdl.handle.net/10054/7352
ISSN: 0921-5093
Appears in Collections:Article

Files in This Item:

There are no files associated with this item.

View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback