Abstract
Direction lly solidified crystals were grown in which the Al-CuAl2 interphase boundary was uniformly misoriented by 6-8 deg with respect to the usual crystallographic relations interface \(\left\| {(1\overline 1 1)_{Al} } \right.\left\| {(21\overline 1 )_{CuAl_2 } } \right.\). The rrays of features then found in the boundary were shown to be ledges by transmission electron microscopy. These ledges could move in the boundary plane during heating-stage experiments. The broad faces of the ledges were the low-energy orient tions mentioned above and were rotated with respect to the macroscopic ihterphase boundary plane by bout 7 deg. From these observations, it is concluded that the misoriented interphase boundaries in Al-CuAl2 curved eutectic crystals are best described in terms of regions of good fit separated by diffusion-glide (DG) ledges.
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