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Orientation sensitivity of focused ion beam damage in pure zirconium: direct experimental observations and molecular dynamics simulations

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Title Orientation sensitivity of focused ion beam damage in pure zirconium: direct experimental observations and molecular dynamics simulations
 
Creator REVELLY, AK
SRINIVASAN, N
PANWAR, AS
KRISHNA, KVM
TEWARI, R
SRIVASTAVA, D
DEY, GK
SAMAJDAR, I
 
Subject irradiation hardening
microtexture
EBSD
zirconium
ion damage
orientation
molecular dynamics
FIB
microstructure
NEUTRON-IRRADIATED ZIRCONIUM
PELLET-CLAD INTERACTION
RADIATION-DAMAGE
DISPLACEMENT CASCADES
SINGLE-CRYSTALS
MICROSTRUCTURAL EVOLUTION
DEFORMATION-BEHAVIOR
ALPHA-ZIRCONIUM
ALLOYS
METALS
 
Description A high-purity predominantly single crystalline zirconium was subjected to controlled focused ion beam (FIB) damage. Damage estimates were obtained from electron backscattered diffraction (EBSD) and nano-indentation measurements on exactly the same area/orientation. The damage kinetics, between different crystallographic orientations, differed by one order of magnitude and a clear hierarchy of orientation sensitive ion damage emerged. Use of a simple geometric approach, linear density of atoms and corresponding scattering cross-sections to impinging gallium ions, could differentiate between extreme damage kinetics; but failed when such differences were relatively minor. Numerically intensive molecular dynamics (MD) simulations, on the other hand, were more effective. However, MD simulations or direct EBSD observations failed to justify anisotropic irradiation hardening (AIH): 3-8 times more hardening for near basal. Though explanation for AIH is indirect, evidence and rationalization for orientation-sensitive radiation damage appears clear and statistically reproducible.
 
Publisher TAYLOR & FRANCIS LTD
 
Date 2014-12-28T12:18:54Z
2014-12-28T12:18:54Z
2014
 
Type Article
 
Identifier PHILOSOPHICAL MAGAZINE, 94(14)1601-1621
1478-6435
1478-6443
http://dx.doi.org/10.1080/14786435.2014.892220
http://dspace.library.iitb.ac.in/jspui/handle/100/16487
 
Language English