Abstract
An account is given of a method of determining orientations in single crystals and polycrystals of aluminium by etch-pits, by which a stereograph can be directly and simply drawn with tolerable accuracy and it is easy to construct the pole figures by using triangular etch-pits. In this method, an accurately constructed model of unit cell having long axes which correspond to ⟨111⟩ and ⟨100⟩ directions is just inserted into the required triangular hole on a celluloid sheet mounted on a hanging horizontal table and so that the upper spotlight projects the poles of the axes on the lower paper board, the pole figures being thus obtained. Further, the pole figures of a grain with rectangular etch-pits can be constructed by measuring the angle between the slip line and the side line of the etch-pit and using some graphs. It has been ascertained that the pole figures prepared by this method agree well with those produced from results obtained by X-ray analysis.
