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Dynamic strain propagation in nanoparticulate zirconia refractory

DOI: 10.1107/S1600576715002393 DOI Help

Authors: Morgan E. Jones (Aberystwyth University) , Stephen Fearn (Aberystwyth University) , Rudolf Winter (Aberystwyth University) , Fajin Yuan (Diamond Light Source) , Alistair Lennie (Diamond Light Source) , Julia Parker (Diamond Light Source) , Stephen Thompson (Diamond Light Source) , Chiu Tang (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Applied Crystallography , VOL 48 , PAGES 386-392

State: Published (Approved)
Published: April 2015
Diamond Proposal Number(s): 6327 , 8143 , 9852

Abstract: 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 1 ms. A 125 W CO2 laser is used to strain the sample with a 25 ms 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 1 ms timescale.

Journal Keywords: Lasers; In Situ X-Ray Powder Diffraction; Zirconia; Dynamic Strain; Microstrain; Structural Refinement; Whole Powder Pattern Fitting

Subject Areas: Physics, Materials

Instruments: I11-High Resolution Powder Diffraction