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

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 diffe...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2014-05, Vol.94 (14), p.1601-1621
Main Authors: Revelly, A.K., Srinivasan, N., Panwar, A.S., Mani Krishna, K.V., Tewari, R., Srivastava, D., Dey, G.K., Samajdar, I.
Format: Article
Language:English
Subjects:
Applied sciences
Computer simulation
Condensed matter: structure, mechanical and thermal properties
Damage
Density
EBSD
Electron back scatter diffraction
Exact sciences and technology
FIB
Fractures
Ion beams
ion damage
irradiation hardening
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
microstructure
microtexture
Molecular dynamics
Orientation
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
Zirconium
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Summary: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.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2014.892220