Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, 8700 Leoben, Austria.
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, 01069 Dresden, Germany.
Sci Rep. 2017 Mar 21;7:44903. doi: 10.1038/srep44903.
Fluctuation electron microscopy of bulk metallic glasses of CuZrAl(Ag) demonstrates that medium-range order is sensitive to minor compositional changes. By analyzing nanodiffraction patterns medium-range order is detected with crystal-like motifs based on the B2 CuZr structure and its distorted structures resembling the martensitic ones. This result demonstrates some structural homology between the metallic glass and its high temperature crystalline phase. The amount of medium-range order seems slightly affected with increasing Ag concentration (0, 2, 5 at.%) but the structural motifs of the medium-range ordered clusters become more diverse at the highest Ag concentration. The decrease of dominant clusters is consistent with the destabilization of the B2 structure measured by calorimetry and accounts for the increased glass-forming ability.
利用体块金属玻璃的涨落电子显微镜研究表明，中程有序对微小的成分变化很敏感。通过分析纳米分辨花样，检测到基于 B2 CuZr 结构及其类似马氏体的畸变结构的具有晶体特征的中程有序基元。这一结果表明金属玻璃与其高温晶相之间存在一定的结构同源性。随着 Ag 浓度（0、2、5 原子%）的增加，中程有序的数量似乎略有变化，但在最高 Ag 浓度时，中程有序团簇的结构基元变得更加多样化。主导团簇的减少与通过量热法测量的 B2 结构的失稳一致，并解释了玻璃形成能力的提高。
