Dynamic strain propagation in nanoparticulate zirconia refractory

Morgan Jones*, Stephen Fearn, Rudolf Winter, Fajin Yuan, Alistair R. Lennie, Julia E. Parker, Stephen P. Thompson, Chiu C. Tang

*Awdur cyfatebol y gwaith hwn

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

180 Wedi eu Llwytho i Lawr (Pure)


Residual and intrinsic strains in granular materials have been studied extensively. However, understanding the dynamic strains that cause these resultant residual strains is key to developing better strain-resistant materials. This investigation demonstrates a method for characterizing dynamic strain propagation in granular materials. The specimen is a zirconia-based refractory composed of sol-gel-derived zirconia nanoparticles in a potassium silicate glass binder. In situ synchrotron X-ray powder diffraction in flat-plate geometry is used to characterize the sample structure on timescales of the order of 1ms. A 125W CO2 laser is used to strain the sample with a 25ms pulse length. To compensate for the poor flux on this timescale, a pump-probe method is repeated 1000 times and the resulting data are subsequently re-binned to improve statistics. A Gaussian weighting function is also used to introduce better contrast between strained and unstrained frames. TOPAS Academic is used for fitting with a Le Bail model in 'batch mode'. Lattice parameters and sample height are refined during fitting, along with a Lorentzian line width for extracting microstrain broadening. Microstrains, , in the range of 1.01 < < 1.46% are reported on a 1ms timescale.

Iaith wreiddiolSaesneg
Tudalennau (o-i)386-392
Nifer y tudalennau7
CyfnodolynJournal of Applied Crystallography
Dyddiad ar-lein cynnar21 Chwef 2015
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 01 Ebr 2015

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