Structural evolution during fragile-to-strong transition in CuZr(Al) glass-forming liquids.
Structural evolution during fragile-to-strong transition in CuZr(Al) glass-forming liquids.
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DOI：
10.1063/1.4907374
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Chao Zhou;Lina Hu;Qijing Sun;Haijiao Zheng;Chunzhi Zhang;Y. Yue
中科院分区：
文献类型：
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作者：
Chao Zhou;Lina Hu;Qijing Sun;Haijiao Zheng;Chunzhi Zhang;Y. Yue
在目前的工作中，我们展示了实验证据的动态脆强（F-S）转变在一系列的CuZr（Al）玻璃形成液体（GFL）。对98种玻璃形成液体动力学的详细分析表明，F-S转变发生在Tf-s = 1.36 Tg附近。利用超淬-退火-X射线散射方法，我们观察到了在F-S转变过程中中程有序（MRO）结构的三阶段演化模式，表明在冷却过程中Tf-s周围的MRO团簇发生了剧烈的变化. CuZr（Al）玻璃纤维中的F-S转变归因于由不同局域有序结构组成的MRO团簇之间的竞争。提出了一个唯象的方案来解释结构的演变从脆到强相的CuZr（Al）玻璃纤维。
In the present work, we show experimental evidence for the dynamic fragile-to-strong (F-S) transition in a series of CuZr(Al) glass-forming liquids (GFLs). A detailed analysis of the dynamics of 98 glass-forming liquids indicates that the F-S transition occurs around Tf-s ≈ 1.36 Tg. Using the hyperquenching-annealing-x-ray scattering approach, we have observed a three-stage evolution pattern of medium-range ordering (MRO) structures during the F-S transition, indicating a dramatic change of the MRO clusters around Tf-s upon cooling. The F-S transition in CuZr(Al) GFLs is attributed to the competition among the MRO clusters composed of different locally ordering configurations. A phenomenological scenario has been proposed to explain the structural evolution from the fragile to the strong phase in the CuZr(Al) GFLs.