Charts for Determination of Crystal Orientation by Surface Traces in Cubic Crystals

概要

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A useful method for the determination of the orientations of crystal grains in polycrystalline specimens having cubic lattice structure was found from the observation of angles between the surface traces such as slip lines, annealing twins or etch-pits which are developed in {111} or {100} planes. From the computation of relations between the angular co-ordinates (ξ, η) of the crystal orientation and the intertrace angles (α, β, etc.) in various directions of {111} or {100} traces, isogonic lines of the intertrace angles were plotted at the interval of two degrees. The case of {111} traces only in three directions was also discussed, and the relations between the angles of the three traces and the number of possible orientations corresponding to the same traces were explained. When the angle between the {100} traces was large, considerable errors were unavoidable in determining the orientations, but an accurate determination was possible if {100} and {111} traces were used in combination. The relations for such a combination were also calculated and plotted in the form of chart. By using these charts, the crystallographic orientations of crystal grains could be determined very rapidly and accurately.
東北大学の論文