Abstract
Thin films of the Al-Cu eutectic (67 wt% Al, 33 wt% Cu) were prepared by the melting method previously described and examined by electron microscopy. The lamellar structure of this eutectic was revealed so clearly that the contrast of the image obtained was comparable to that obtained by a replica method, which proved that the present film represented the same structure as the massive specimen. Electron diffraction study revealed which lamella belongs to the κ or θ phase and permitted the determining of the relative crystal orientation between two types of lamellas.

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