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Lattice Distortion in Nickel-Iron


RECENT investigations of W. A. Wood1 on the broadening of high-order Debye-Scherrer lines of copper and -brass have shown that the lattice distortion may be accompanied by changes in the spacings of various lattice-planes, pointing to a change in shape and (perhaps) size of the unit cell. The occurrence of such an effect can be very clearly shown for nickel-iron. For an alloy with 53 atomic per cent Fe, the side-length of the unit-cube a is 3.58 A., so that the (400)-reflections with cobalt K1 and K2 radiation occur at about 85° and 87° respectively, and thus show extremely large dispersion (the distance of the 1 2-lines for a specimen to film distance of 12 cm. being about 7 mm.). Back-reflection photographs of discs, cut from recrystallised cold-rolled band, show these reflections with great intensity, as the recrystallisation texture is a very pronounced cube-texture (Würfellage), all crystals lying with a cube-face and side within ±10° parallel to the plane and direction of rolling2. The effect of compression-deformation is shown in Fig. 1, where a relates to the original disc, b to the same disc after compressing it to about 10 per cent (the discs were rotated about an axis parallel to the X-ray beam). The shift of the 12-lines amounts to about one sixth of their distance apart, corresponding to a decrease in spacing of about 0.04 per cent.

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  1. 1

    W. A. Wood, Phil. Mag., 18, 495; 1934. 19, 219; 1935.

  2. 2

    W. G. Burgers and J. L. Snoek, Z. Metallk., in press.

  3. 3

    Compare also G. W. Brindley and F. W. Spiers, Proc. Leeds Phil. Soc., 3, 4; 1934. V. Caglioti and G. Sachs, Z. Phys., 74, 647; 1932.

  4. 4

    W. G. Burgers, Pap. and Disc. Intern. Conf. Physics, London. 2, 139; 1934.

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