Thermodynamics and kinetics of bulk metallic glass
Thermodynamics and kinetics of bulk metallic glass
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DOI：
10.1557/mrs2007.122
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发表时间：
2007-08-01
期刊：
影响因子：
5
通讯作者：
Wang, W. H.
中科院分区：
文献类型：
--
作者：
Busch, R.;Schroers, J.;Wang, W. H.
大块金属玻璃(BMG)是一种多组分合金，通常有三到五个组分，原子尺寸失配较大，成分接近深度共晶。在BMG液体中填充非常稠密，自由体积含量低，导致粘度比纯准熔体中高出几个数量级。通过结构和化学原子有序实现的致密堆积也使形成BMG的液体在能量和熵上更接近其相应的晶态。这些因素导致析晶动力学缓慢，从而导致高玻璃形成能力。本文着重介绍了BMG的热力学和动力学性质，以及它们对超高玻璃形成能力的贡献。文中还提出了一些与力学性能有关的可能联系。
Bulk metallic glasses (BMGs) are multicomponent alloys with typically three to five components with large atomic size mismatch and a composition close to a deep eutectic. Packing in BMG liquids is very dense, with a low content of free volume resulting in viscosities that are several orders of magnitude higher than in pure meta melts. The dense packing accomplished by structural and chemical atomic ordering also brings the BMG-forming liquid energetically and entropically closer to its corresponding crystalline state. These factors lead to slow crystallization kinetics and consequentially to high glass-forming ability. This article highlights the thermodynamic and kinetic properties of BMGs and their contributions to extraordinarily high glass-forming ability. Some possible links with mechanical properties are also suggested.