Abstract
An amorphous phase in Zr65Al7.5Cu17.5Ni10 crystallizes via co-precipitation of the I-phase and NiZr2 phase in the first crystallization step, followed by decomposition of the I-phase into the CuZr2 and NiZr2 phases. The NiZr2 phase transforms to a stable Zr6NiAl2 phase at a high temperature. The alloys containing Ag crystallize via a two-step process: firstly, the I-phase nucleates homogeneously and grows in an amorphous matrix; secondly, the quasicrystal and remaining amorphous phase transforms into the stable CuZr2 and Zr6NiAl2 phases. With increasing Ag, the I-phase becomes more thermally stable and the grain size in the I-phase decreases due to increased frequency of homogeneous nucleation. The quasi-lattice constant of the I-phase decreases with increasing Ag content.
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This article is based on a presentation made in the “Symposium on Metastable Phases”, held at Korea Institute of Science and Technology, Seoul, Korea, November 10, 2000 sponsored by The Korean Institute of Metals and Materials.
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Lee, J.K., Kim, S.H., Kim, W.T. et al. Precipitation of the icosahedral phase in amorphous Zr65Cu17.5−xAl7.5Ni10Agx (x=0,2.5, 5, 7.5 and 10) alloys. Met. Mater. Int. 7, 187–190 (2001). https://doi.org/10.1007/BF03026974
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DOI: https://doi.org/10.1007/BF03026974