Abstract
By rapidly quenching with a melt-spinning apparatus, it has been possible to produce ductile amorphous single-phase ternary Zr85−x M x Si15 (M=IV–VIII group transition metals) alloys in wide composition ranges. The crystallization temperature, activation energy for crystallization and hardness increase significantly only with the addition of group V and VI elements (V, Nb, Ta, Cr, Mo and W). Such a solute element effect could be interpreted on the basis that the chemical bonding between the solute elements and silicon is stronger for the group V and VI elements than for the other group elements. Crystallization studies of the amorphous Zr85Si15 and Zr65Nb20Si15 alloys have been carried out through transmission electron microscopy and differential scanning calorimetry techniques. The binary alloy crystallizes by the uniform precipitation of b c cβ-Zr over the entire area of the amorphous matrix followed by the appearance of the metastable b c tetragonal Zr3Si compound from the remaining amorphous phase. On the other hand, the ternary alloy transforms by the simultaneous precipitation ofβ-Zr(Nb) and b c tetragonal Nb3Si. Theβ-Zr and Zr3Si phases were found to be in metastable states, the equilibrium structure being a mixture ofα-Zr and Zr4Si compound in the binary alloy.
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Inoue, A., Takahashi, Y., Suryanarayana, C. et al. Thermal stability and crystallization behaviour of amorphous Zr-M-Si (M=IV–VIII group transition metals) alloys. J Mater Sci 17, 3253–3262 (1982). https://doi.org/10.1007/BF01203492
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DOI: https://doi.org/10.1007/BF01203492