Orientation sensitivity of focused ion beam damage in pure zirconium: direct experimental observations and molecular dynamics simulations
DSpace at IIT Bombay
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Title |
Orientation sensitivity of focused ion beam damage in pure zirconium: direct experimental observations and molecular dynamics simulations
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Creator |
REVELLY, AK
SRINIVASAN, N PANWAR, AS KRISHNA, KVM TEWARI, R SRIVASTAVA, D DEY, GK SAMAJDAR, I |
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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 |
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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.
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Publisher |
TAYLOR & FRANCIS LTD
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Date |
2014-12-28T12:18:54Z
2014-12-28T12:18:54Z 2014 |
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Type |
Article
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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 |
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Language |
English
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