Structural changes during a liquid-liquid transition in the deeply undercooled Zr58.5Cu15.6Ni12.8Al10.3Nb2.8 bulk metallic glass forming melt
Structural changes during a liquid-liquid transition in the deeply undercooled Zr58.5Cu15.6Ni12.8Al10.3Nb2.8 bulk metallic glass forming melt
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DOI：
10.1103/physrevb.93.014201
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发表时间：
2016-01-13
影响因子：
3.7
通讯作者：
Busch, Ralf
中科院分区：
文献类型：
--
作者：
Stolpe, Moritz;Jonas, Isabell;Busch, Ralf
使用高能同步加速器X射线辐射结合静电悬浮，原位结构分析的大块金属玻璃形成液体进行从液相线温度以上的玻璃化转变。数据表明在T/T-g类似于1.2的深度过冷状态下的液-液转变（LLT），其表现为热容的最大值和在没有明显密度变化的情况下总结构因子的第一峰值位置的突然移位。相应的实空间数据的分析表明，LLT涉及的变化，在短期和中期的秩序。中程有序长度尺度上的结构变化意味着与实验粘度数据一致的脆-强转变。
Using high energy synchrotron x-ray radiation combined with electrostatic levitation, in situ structural analysis of a bulk metallic glass forming liquid is performed from above the liquidus temperature down to the glass transition. The data indicate a liquid-liquid transition (LLT) in the deeply undercooled state at T/T-g similar to 1.2 which manifests as a maximum in the heat capacity and an abrupt shift in the first peak position of the total structure factor in the absence of a pronounced density change. Analysis of the corresponding real-space data shows that the LLT involves changes in short-and medium-range order. The structural changes on the length scale of medium-range order imply a fragile-strong transition in agreement with experimental viscosity data.