论文标题
在超冷的金属液体中拆卸α-释放的结构和动力学成分
Disentangling structural and kinetic components of the α-relaxation in supercooled metallic liquids
论文作者
论文摘要
与超冷液体中α-浮肿相关的粒子运动仍然具有挑战性的科学家，因为它难以通过实验进行探测。通过结合同步加速器技术，我们发现了PT42.5CU27NI9.5P21和PD42.5CU27NI9.5P21液体中微观结构 - 动力学关系的存在，这使我们能够解散对α-Process的结构和动力学贡献。虽然两种合金显示出相似的动力学脆弱性，但它们的结构脆弱性不同并与描述密度波动衰减的拉伸参数的温度依赖性相关。这意味着超冷合金中动态异质性的演变取决于熔体结构的刚度。我们还发现，原子运动不仅反映了拓扑顺序，还反映了化学短距离顺序，这可能会导致介质长度尺度下的α-过程的令人惊讶的放缓。这些结果将有助于理解玻璃过渡，这仍然缺失。
The particle motion associated to the α-relaxation in supercooled liquids is still challenging scientists due to its difficulty to be probed experimentally. By combining synchrotron techniques, we found the existence of microscopic structure-dynamics relationships in Pt42.5Cu27Ni9.5P21 and Pd42.5Cu27Ni9.5P21 liquids which allows us to disentangle structural and kinetic contributions to the α-process. While the two alloys show similar kinetic fragilities, their structural fragilities differ and correlate with the temperature dependence of the stretching parameter describing the decay of the density fluctuations. This implies that the evolution of dynamical heterogeneities in supercooled alloys is determined by the rigidity of the melt structure. We find also that the atomic motion not only reflects the topological order but also the chemical short-range order, which can lead to a surprising slowdown of the α-process at the mesoscopic length scale. These results will contribute to the comprehension of the glass transition, which is still missing.
