A new approach for determining the critical cooling rates of nucleation in glass-forming liquids

A new approach for determining the critical cooling rates of nucleation in glass-forming liquids
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确定玻璃形成液体中成核临界冷却速率的新方法

DOI:
10.1111/jace.14926
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发表时间:
2017-09
影响因子:
3.9
通讯作者:
张艳飞
张艳飞
中科院分区:
材料科学2区
文献类型:
--
作者:
刘树江;陶海征;张艳飞

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由于晶体同时成核和生长,液体在低于液相线温度下的结晶是一个复杂的过程。成核是结晶过程的关键初始步骤,并且影响玻璃形成能力,特别是当成核和晶体生长与温度曲线之间存在较大重叠时。从温度-时间-转变(TTT)图,人们可以估计玻璃形成的临界冷却速率,qc,但是这是耗时的。在本文中,我们建立了一个简单的方法来确定qc的热量和粘度数据。基于经典形核理论,结合两个温度相关函数描述了结晶起始温度与冷却速率之间的关系。新方法适用于各种玻璃成形系统。这项工作也提供了洞察异质成核和玻璃形成动力学。
Crystallization of a liquid below liquidus temperature is a complex process due to simultaneous nucleation and growth of crystals. Nucleation is the crucial initial step of the crystallization process, and affects the glass-forming ability, especially when there is a large overlap between nucleation and crystal growth versus temperature curves. From the temperature-time-transformation (TTT) diagram, one can estimate the critical cooling rate, qc∗, of glass-formation, however this is time-consuming. In this paper, we establish a simple approach to determine the qc∗ using calorimetric and viscometric data. Based on the classical nucleation theory, the correlation between the crystallization onset temperature and cooling rate is described by combining two temperature-dependent functions. The new approach is applicable to a wide range of glass-forming systems. This work also gives insight into heterogeneous nucleation and glass formation kinetics.
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发表时间: 2007-12
影响因子: 4.7
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