Defect dynamics in polycrystalline zirconium alloy probed in situ by primary extinction of neutron diffraction

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dc.contributor.authorKabra, Sen_AU
dc.contributor.authorYan, Ken_AU
dc.contributor.authorCarr, DGen_AU
dc.contributor.authorHarrison, RPen_AU
dc.contributor.authorDippenaar, RJen_AU
dc.contributor.authorReid, Men_AU
dc.contributor.authorLiss, KDen_AU
dc.date.accessioned2013-09-12T02:28:19Zen_AU
dc.date.available2013-09-12T02:28:19Zen_AU
dc.date.issued2013-02-13en_AU
dc.date.statistics2013-09-12en_AU
dc.description.abstractAfter alpha+beta-zirconium has fully transformed into beta-phase upon heating, the intensities of all beta-Zr Bragg reflections decrease simultaneously as a function of time. It is shown that this effect represents a transition from the kinematic to the dynamic theory of diffraction due to the ever increasing crystal perfection driven by thermal recovery of the system. The best fitting coherent crystallite size of 30 mu m and other microstructural features are verified by in situ laser scanning confocal microscopy. This effect of primary extinction in neutron diffraction has been employed to further investigate the crystal perfection kinetics. Upon further heating, crystal recovery is identified as a process of dislocation annihilation, suffering from lattice friction. Upon cooling, precipitating alpha-Zr induces strain into the perfect beta-crystallites, re-establishing the kinematic diffraction intensities. An Avrami analysis leads to the estimations of nucleation time, consumption of nucleation sites and lower-dimensional growth. Such technique bears great value for further investigation on all metal systems annealed close to the melting temperature. © 2013, American Institute of Physics.en_AU
dc.identifier.articlenumber63513en_AU
dc.identifier.citationKabra, S., Yan, K., Carr, D. G., Harrison, R. P., Dippenaar, R. J., Reid, M., & Liss, K. D. (2013). Defect dynamics in polycrystalline zirconium alloy probed in situ by primary extinction of neutron diffraction. Journal of Applied Physics, 113(6), Article Number 63513. doi:10.1063/1.4790177en_AU
dc.identifier.govdoc5174en_AU
dc.identifier.issn0021-8979en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleJournal of Applied Physicsen_AU
dc.identifier.urihttp://dx.doi.org/10.1063/1.4790177en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/4698en_AU
dc.identifier.volume113en_AU
dc.language.isoenen_AU
dc.publisherAmerican Institute Physicsen_AU
dc.subjectMetalsen_AU
dc.subjectMicrostructureen_AU
dc.subjectNucleationen_AU
dc.subjectZirconiumen_AU
dc.subjectThermal recoveryen_AU
dc.subjectAnnealingen_AU
dc.subjectNeutron diffractionen_AU
dc.titleDefect dynamics in polycrystalline zirconium alloy probed in situ by primary extinction of neutron diffractionen_AU
dc.typeJournal Articleen_AU
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