Abstract
Image contrast of whisker edges in X-ray topographs is studied for well annealed iron whiskers. The contrast reversal is observed when the reflection vector is reversed. This fact indicates that the crystal lattice around the edge is distorted. A possible distortion model is presented, in which the lattice around the edge is in expansion on wide surfaces and in contraction on narrow surfaces. Heavy lattice distortion is also found at the roots of whisker branches. The lattice distortion is considered to be caused by impurity segregation around the whisker edges.
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