Kube Sebastian A, Sohn Sungwoo, Ojeda-Mota Rodrigo, Evers Theo, Polsky William, Liu Naijia, Ryan Kevin, Rinehart Sean, Sun Yong, Schroers Jan
Department of Mechanical Engineering and Materials Science, Yale University, New Haven, CT, USA.
School of Engineering and Applied Science, Yale University, New Haven, CT, USA.
Nat Commun. 2022 Jun 28;13(1):3708. doi: 10.1038/s41467-022-31314-3.
The viscosity and its temperature dependence, the fragility, are key properties of a liquid. A low fragility is believed to promote the formation of metallic glasses. Yet, the fragility remains poorly understood, since experimental data of its compositional dependence are scarce. Here, we introduce the film inflation method (FIM), which measures the fragility of metallic glass forming liquids across wide ranges of composition and glass-forming ability. We determine the fragility for 170 alloys ranging over 25 at.% in Mg-Cu-Y. Within this alloy system, large fragility variations are observed. Contrary to the general understanding, a low fragility does not correlate with high glass-forming ability here. We introduce crystallization complexity as an additional contribution, which can potentially become significant when modeling glass forming ability over many orders of magnitude.
粘度及其温度依赖性，即脆性，是液体的关键特性。低脆性被认为有助于金属玻璃的形成。然而，由于其成分依赖性的实验数据稀缺，脆性仍然 poorly understood。在这里，我们介绍了薄膜膨胀法（FIM），它可以在很宽的成分范围和玻璃形成能力范围内测量金属玻璃形成液体的脆性。我们确定了170种镁 - 铜 - 钇合金的脆性，其成分范围超过25 at.%。在这个合金体系中，观察到了较大的脆性变化。与一般认识相反，这里低脆性与高玻璃形成能力并不相关。我们引入结晶复杂性作为一个额外的因素，当在多个数量级上对玻璃形成能力进行建模时，它可能会变得很重要。
