Thermal analysis, fragility and viscosity of Au-based metallic glasses
Thermal analysis, fragility and viscosity of Au-based metallic glasses
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DOI：
10.1016/j.jnoncrysol.2010.08.032
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发表时间：
2010-09
影响因子：
3.5
通讯作者：
G. Fiore;I. Ichim;L. Battezzati
中科院分区：
文献类型：
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作者：
G. Fiore;I. Ichim;L. Battezzati
已生产出基于 Au 的金属玻璃，其成分为 Au49Cu26.9Ag5.5Pd2.3Si16.3 和 (Au49Cu26.9Ag5.5Pd2.3Si16.3)99X1，其中 X=Ti 和 In，并以带状形式进行表征。它们在结晶前表现出玻璃化转变和相当宽的过冷液体区域。采用两种涉及差示扫描量热法 (DSC) 测量的方法研究了合金的脆性指数 (m)。在一种方法中，玻璃化转变温度是在 0.3-100°C/min 范围内的不同扫描速率下测定的，其趋势拟合为 m。另一方面，m 是从扫描速率为 20℃/min 时的玻璃化转变范围的温度跨度获得的。导出并彻底讨论了过冷液体粘度的含义，并以 VFT（Vogel-Fulcher-Tammann）表达式结束。
Metallic glasses based on Au of composition Au49Cu26.9Ag5.5Pd2.3Si16.3and (Au49Cu26.9Ag5.5Pd2.3Si16.3)99X1where X=Ti and In, have been produced and characterized in ribbon form. They show a glass transition and a rather wide undercooled liquid region before crystallisation. The fragility index (m) of the alloys was investigated with two methods involving differential scanning calorimetry (DSC) measurements. In one method the glass transition temperature was determined at different scanning rates in the range 0.3–100°C/min and its trend fitted to give m. In the other m was obtained from the temperature span of the glass transition range at the scanning rate of 20°C/min. Implications for viscosity in the undercooled liquid are derived and thoroughly discussed ending with a VFT (Vogel–Fulcher–Tammann) expression for it.