Anomalous system-size dependence of properties at the fragile-to-strong transition in a bulk-metallic-glass forming melt

Anomalous system-size dependence of properties at the fragile-to-strong transition in a bulk-metallic-glass forming melt
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大块金属玻璃成形熔体中从脆到强转变时性能的反常系统尺寸依赖性

DOI:
10.1016/j.commatsci.2018.09.047
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发表时间:
2018
影响因子:
3.3
通讯作者:
M. H. Müser
M. H. Müser
中科院分区:
材料科学3区
文献类型:
--
作者:
S. V. Sukhomlinov;M. H. Müser

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与许多其他玻璃形成体一样,块体金属玻璃(BMG)形成熔体经历了脆强转变(FST),这伴随着比热cp中的小但明显的峰。由于这个峰,FST有时被解释为涂抹相变。在CP中的峰的尺寸缩放分析允许相变的顺序被准确地确定。这促使我们使用计算机模拟,其中系统的大小是在一个良好的控制方式变化的三元BMG前(Zr 0.606 Cu 0.29 Al 0.104)的结构和动力学性质的研究CP沿着。我们的模型系统再现了典型的,几乎不连续的交叉之间的非Arrhenius到Arrhenius型动态,它定义了FST。然而,在相反的相变的预期,更大的系统较小的峰在CP。其他属性也揭示了尺寸的依赖性,这是难以调和的FST的解释是一个(涂抹)相变不同的本地结构之间的竞争。
As many other glass formers do, bulk-metallic-glass (BMG) forming melts undergo a fragile-to-strong transition (FST), which is accompanied by a small but noticeable peak in the specific heat c p. Because of this peak, the FST is sometimes interpreted as a smeared-out phase transformation. Finite-size scaling analysis of peaks in c p allows the order of a phase transition to be accurately determined. This motivated us to study c p along with structural and dynamical properties of a ternary BMG former (Zr 0.606 Cu 0.29 Al 0.104) using computer simulations, in which the system size was varied in a well-controlled fashion. Our model system reproduces the typical, almost discontinuous cross-over between non-Arrhenius to Arrhenius-type dynamics, which defines the FST. However, in contrast to the expectations for a phase transformation, the larger the system the smaller the peak in c p. Other properties also reveal a size dependence, which is difficult to reconcile with the interpretation of the FST being a (smeared-out) phase transformation resulting from the competition between different local structures.
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