Abstract
The influence of composition on the formation and stability of Ni-based glassy alloys containing Si and B has been investigated systematically. Depending on the Si∶B ratio certain compositions, with total metalloid contents in the range 17 to 49 at% (a wider range than has hitherto been reported for metal-metalloid glasses), have been vitrified by melt-spinning to an average thickness of 17 μm. For metalloid concentrations greater than 36 to 40 at% the amorphous phase is brittle in the as-quenched state. The highest crystallization temperatures, T x, occur at 32 to 38 at% metalloid, the actual value of T x again depending on the Si∶B ratio. It is shown that, over a wide composition range, the glass-forming boundary corresponds closely with a value for the reduced crystallization temperature isometric of 0.52. This value corresponds to a critical cooling rate for glass formation of about 106 K sec−1, predicted from kinetic theories and assuming that T x is a good estimate of the glass transition temperature, T g. This agrees quite closely with the cooling rate for approximately 17 μm thick tape predicted from thermal studies of the melt-spinning process. Hence, T x/T liq usefully describes the glass-forming ability (GFA) for much of the composition range studied, although preliminary results suggest that near the centre of the glass-forming range the GFA may be over-estimated. Substitution of Si by other metalloid elements from Groups IIIb–Vb in Ni78Si10B12 glassy alloy generally decreases the thermal-stability.
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Donald, I.W., Davies, H.A. The influence of composition on the formation and stability of Ni-Si-B metallic glasses. J Mater Sci 15, 2754–2760 (1980). https://doi.org/10.1007/BF00550543
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DOI: https://doi.org/10.1007/BF00550543