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Defect dynamics in polycrystalline zirconium alloy probed in situ by primary extinction of neutron diffraction
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Image of FIG. 1.
FIG. 1.

(a) Neutron diffraction patterns from Zr-2.5Nb as a function of time while temperature is ramped; (b) and (c) Rietveld refinements at snapshots in the β and α + β phase fields, respectively.

Image of FIG. 2.
FIG. 2.

Behavior of the normalized intensities of β-Zr reflections (a) and selected reflections (b) for 2 different heating ramps. The features at A,B,C,D are described in the text.

Image of FIG. 3.
FIG. 3.

In situ laser scanning confocal microscopy on Zr-2.5Nb at given time and temperatures of the heating cycle.

Image of FIG. 4.
FIG. 4.

Ratio between the Bragg reflectivities calculated by the dynamic and the kinematic theory of diffraction, respectively, as a function of crystal thickness normalized to extinction length (continuous line). The dots mark the experimental values of the first 7 reflections at the time of minimal reflectivity. Low-order reflections lie to the right and high order to the left of the distribution.

Image of FIG. 5.
FIG. 5.

Time behavior of the β-200 Bragg reflectivity upon two different heating-cooling cycles (blue, pink). Overall linear plot (a) denoting the zero times for annihilation a and nucleation n studies in (b) and (c), respectively. The red lines are linear fits to the non-linear plot indicating the slopes nearby.


Generic image for table
Table I.

Quantitative numbers for reciprocal lattice vector Ghkl, Miller indices h,k,l, multiplicity m, extinction length Δ0, longitudinal and transverse Darwin widths, |ε| and Δθ, lattice spacing dhkl = 2π/Ghkl for the first 10 reflections in β Zr-2.5Nb in solid solution at 1273 K.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Defect dynamics in polycrystalline zirconium alloy probed in situ by primary extinction of neutron diffraction