Abstract
The morphology of the tweed pattern during phase separation of CuNiFe single crystals has been followed by two-dimensional small-angle scattering (2D SAS), taking advantage of the X-ray constant enhancement by anomalous scattering. The 2D (100)* intensity maps have maxima with a fourfold symmetry and can be quantitatively described by three families of independent rows of (100) platelets alternatively enriched in Cu and in NiFe. Three length scales are defined: the mean platelet thickness lambda /2 along the pile-up, its thickness distribution delta lambda , and its diameter D. Their kinetics are lambda varies as tau -0.2, delta lambda varies as t-0.27, and D varies as t-0.4 respectively. These three length scales are thus independent: in this tweed-pattern coarsening, there is no global scaling due to the increase of the anisotropy and to the increase of the regularity in the pile-up.
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