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Grain fragmentation and twinning in deformed Zircaloy 2: Response to positron lifetime measurements

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Title Grain fragmentation and twinning in deformed Zircaloy 2: Response to positron lifetime measurements
 
Creator SAHOO, SK
HIWARKAR, VD
KRISHNA, KVM
SAMAJDAR, I
PANT, P
PUJARI, PK
DEY, GK
SRIVASTAV, D
TIWARI, R
BANERJEE, S
 
Subject energy dislocation-structures
annihilation techniques
plastic-deformation
defects
plane
microstructures
spectroscopy
orientation
boundaries
evolution
positron
tem
ebsd
zirconium
defect
dislocation
grain fragmentation
deformation twinning
 
Description 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) 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
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-27T23:43:34Z
2011-12-26T12:58:41Z
2011-12-27T05:49:04Z
2011-07-27T23:43:34Z
2011-12-26T12:58:41Z
2011-12-27T05:49:04Z
2010
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 527(6), 1427-1435
0921-5093
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
 
Language en