Interferometric Study of Slip Bands on Metal Crystals

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WE have applied multiple-beam interference methods to the study of the displacements which may be expected to appear on the surfaces of metal crystal when strained, and this technique has revealed nove features. The principal advantages resulting from using this technique are fourfold: (i) the detailed contours of displacement steps are clearly revealed ; (ii) exact evaluation of displacements of even but a few angstrom units can be made ; (iii) owing to high sensitivity, the onset of the slip is shown at a very early stage ; (iv) slip with abnormally low loads can be detected.