DETERMINATION OF GRAIN MISORIENTATION FROM LAUE PATTERNS

Several computerized procedures for determination of the axis-angle pa ir characterizing grain misorientation in bicrystals using Laue patter ns are described. The procedures are based on the linear least squares fit method; they are rapid and easy to use. One of the procedures can be used for determination of single-crystal orientation. It is necess ary to measure the coordinates of spots and the origin in the referenc e system of the Laue pattern and find the indices hkl of at least two spots. Attention is paid to accuracy of determination of the rotation axis and rotation angle. In favourable cases of orientation, they are determined with a precision of several minutes of arc.