The isothermal crystallization times and critical cooling rates of the liquid phase are determined for the two bulk metallic glass forming alloys Au49Ag5.5Pd2.3Cu26.9Si16.3 and Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3 by using fast differential scanning calorimetry, covering the whole timescale of the crystallization event of the metallic melt. In the case of Au49Ag5.5Pd2.3Cu26.9Si16.3, a typical crystallization nose was observed, whereas for the Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3, a more complex crystallization behavior with two distinct crystallization noses was found. Even for the complex crystallization behavior of the Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3 alloy it is shown that the minimal isothermal nose time τ_x^* does allow for a quantification of the macroscopic critical thickness. It is discussed in contrast to the critical cooling rate, which is found to allow less exact calculations of the critical thickness and thus does not correlate well with the critical cooling rate from macroscopic experiments. Additionally the crystallization data of Au49Ag5.5Pd2.3Cu26.9Si16.3 was modelled using classical nucleation theory with the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation, enabling a determination of the interfacial energy.

中文翻译：

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新开发的 Au-Ga 块状金属玻璃的超快扫描量热法

采用快速差示扫描法测定了两种块状金属玻璃成形合金Au49Ag5.5Pd2.3Cu26.9Si16.3和Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3的液相等温结晶时间和临界冷却速率量热法，涵盖金属熔体结晶事件的整个时间尺度。在 Au49Ag5.5Pd2.3Cu26.9Si16.3 的情况下，观察到典型的结晶鼻，而对于 Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3，发现具有两个不同结晶鼻的更复杂的结晶行为. 即使对于 Au51.6Ag5.8Pd2.4Cu20.2Ga6.7Si13.3 合金的复杂结晶行为，也表明最小等温鼻尖时间 τ_x^* 确实允许对宏观临界厚度进行量化。与临界冷却速率相比，它被讨论，发现它允许对临界厚度进行不太精确的计算，因此与宏观实验的临界冷却速率没有很好的相关性。此外，Au49Ag5.5Pd2.3Cu26.9Si16.3 的结晶数据使用经典成核理论和 Johnson-Mehl-Avrami-Kolmogorov (JMAK) 方程建模，从而能够确定界面能。