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Reversible Structural Relaxation in Fe-Ni-B-Si Metallic Glasses

  • R. Brüning (a1), Z. Altounian (a1) and J. O. Ström-Olsen (a1)

Abstract

Reversible structural relaxation has been studied in (Fe1-xNix)80B10Si10 by differential scanning calorimetry and X-ray diffraction. It is found that surface crystallization plays a major role in inhibiting reversibility. In consequence previously published data have presented a misleading picture about the composition dependence of the reversible effect in Fe-Ni-B-Si, which simply increases monotonically with Ni composition. There is no evidence that chemical short range order plays any role in reversibility.

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1. Egami, T., Mat. Res. Bull. 13, 557562 (1977).
2. Inoue, A., Chen, H. S., Masumoto, T. and Ajuria, S.A. Sci. Rep. of RITU March 1985 116–140 (1985).
3. Altounian, Z., Strom-Olsen, J.O. and Olivier, M. (unpublished).
4. O'Handley, R.C., Corb, B.W., Megusar, J. and Grant, N.J. in ‘Liquid and Amorphous Metals V’, edited by Wagner, C.N.J. and Johnson, W.L. (North-Holland, Amsterdam, 1984) pp. 773780.
5. Inoue, et al. [2] state that the reversible effect is decreased by preannealing, in direct contradiction with our findings. We believe that the reason for this is that their pre-annealing is carried out at so high temperature that some crystallization was inevitable.
6. In contrast to its behaviour with composition, the reversible effect increases slightly with annealing temperature after the appearance of crystallization. It reaches its maximum for Ta from between 30 and 80 K higher than the value which fist induces some crystallization. Clearly the enhanced kinetics at the higher temperature delay the decrease due to crystallization.

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