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Link between volume, thermal expansion, and bulk metallic glass formability
Physical Review Materials ( IF 3.4 ) Pub Date : 2020-09-16 , DOI: 10.1103/physrevmaterials.4.095602
A. K. Gangopadhyay , C. E. Pueblo , K. F. Kelton

The specific volumes and thermal expansion coefficients of 41 transition-metal based alloy liquids, which include both bulk and marginal glass-formers, are presented. Those parameters are compared with their values either in the corresponding crystal phases or in their constituent elemental liquids. The volume differences in both cases at the liquidus temperature, Tl, correlate well with the critical thicknesses, dcrit of the corresponding glass, taken either from literature or from estimates. The estimates are based on a recent study [Dai et al., J. Non-Cryst. Solids 525, 119673 (2019)], which requires knowledge of the liquid expansion coefficient and viscosity. The volume differences between the better glass-forming liquids and the crystal phases are smaller; they are larger when compared with the elemental liquids. The thermal expansion coefficients of the liquids correlate well with the cohesive energies and fragilities. Their differences with the crystal phases and estimates from elemental liquids correlate well with dcrit. The differences are smaller for the former and larger for the latter for alloy liquids having larger values of dcrit. This parameter then appears to be a prime indicator of glass formability. The results are explained in terms of changes in the anharmonicity and structural contributions to the expansion coefficients on alloying.

中文翻译:

体积,热膨胀和大块金属玻璃成形性之间的联系

介绍了41种过渡金属基合金液体的比容和热膨胀系数,其中包括块状和边缘玻璃形成剂。将这些参数与其在相应的晶相中或在其组成元素液体中的值进行比较。两种情况下在液相线温度下的体积差异,Ť与临界厚度很好地相关, d暴击相应玻璃的取值,取自文献或估计值。估计是基于最近的一项研究[Dai等。J. Non-Cryst。固体 525,119673(2019)],这需要液体膨胀系数和粘度的知识。更好的玻璃形成液体和晶相之间的体积差较小;与元素液体相比,它们更大。液体的热膨胀系数与内聚能和脆性密切相关。它们与晶相的差异以及元素液体的估算值与d暴击。的差异是小的为前和较大的为具有较大的值的合金液体为后者d暴击。然后,该参数似乎是玻璃可成形性的主要指标。用非谐性的变化和结构对合金膨胀系数的影响来解释结果。
更新日期:2020-09-16
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