Li Y, Guo Q, Kalb J A, Thompson C V
Singapore-Massachusetts Institute of Technology (MIT) Alliance, 4 Engineering Drive 3, Singapore 117576.
Science. 2008 Dec 19;322(5909):1816-9. doi: 10.1126/science.1163062.
The density of the amorphous phase of metals is generally thought to be related to glass formation, but this correlation has not been demonstrated experimentally to date. In this work, systematic deflection measurements using microcantilevers and a combinatorial deposition method show a correlation between glass-forming ability and the density change upon crystallization over a broad compositional range in the copper-zirconium binary system. Distinct peaks in the density of the amorphous phase were found to correlate with specific maxima in the critical thickness for glass formation. Our findings provide quantitative data for the development of structural models of liquids that are readily quenched to the amorphous state. The experimental method developed in this work can facilitate the search for new glass-forming alloys.
一般认为金属非晶相的密度与玻璃形成有关，但迄今为止这种相关性尚未得到实验证明。在这项工作中，使用微悬臂梁的系统挠度测量和组合沉积方法表明，在铜锆二元体系的广泛成分范围内，玻璃形成能力与结晶时的密度变化之间存在相关性。发现非晶相密度的明显峰值与玻璃形成临界厚度的特定最大值相关。我们的研究结果为易于淬火成非晶态的液体结构模型的发展提供了定量数据。这项工作中开发的实验方法有助于寻找新的玻璃形成合金。
