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首页> 外文会议>Symposium on Quasicrystals-Preparation, Properties and Applications Nov 27-30, 2000, Boston, Massachusetts, U.S.A. >Phase Diagram and Electrostatic Levitation Undercooling Studies of Polytetrahedral Phases in Ti-Fe-Si-O and Ti-Zr-Ni Alloys
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Phase Diagram and Electrostatic Levitation Undercooling Studies of Polytetrahedral Phases in Ti-Fe-Si-O and Ti-Zr-Ni Alloys

机译：Ti-Fe-Si-O和Ti-Zr-Ni合金中多四面体的相图和静电悬浮过冷研究

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摘要

New information on the phase diagrams of Ti-Fe-Si-O and Ti-Zr-Ni alloys near the quasicryslal and rational approximant compositions is presented. α(TiFeSiO), the 1/1 rational approximant, is shown to form in a peritectic mode from the liquid, indicating the possibility to produce single-crystal samples. Very long duration annealing studies demonstrate unambiguously that the TiZrNi i-phase and 1/1 approximant form at low temperatures by a solid-state transformation; their phase fields do not extend to the liquidus temperatures. The first undercooling measurements of electrostatically-levitated droplets of the Ti-Zr-Ni alloys are presented. These nucleation studies provide new information on the structural relations between polytetrahcdral phases and the undercoolcd liquid, and on the phase transformation processes. The reduced undercooling for the polytetrahedral phases in these alloys is less than for crystal phases of a similar composition, demonstrating a low interfacial energy between the polytetrahedral phase and the liquid.
机译：提出了有关准结晶附近的Ti-Fe-Si-O和Ti-Zr-Ni合金相图的新信息以及有理近似值。显示出1 / e有理近似值α（TiFeSiO）是从液体以包晶形式形成的，表明有可能生产单晶样品。非常长时间的退火研究清楚地表明，TiZrNi i相和1/1近似物在低温下通过固相转变形成。它们的相场不扩展到液相线温度。介绍了Ti-Zr-Ni合金的静电悬浮液滴的首次过冷测量。这些成核研究为聚四面体相与过冷液相之间的结构关系以及相变过程提供了新的信息。这些合金中多四面体相减少的过冷度小于相似组成的晶相的过冷度，这表明多四面体相与液体之间的界面能较低。

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