He J H, Sheng H W, Schilling P J, Chien C L, Ma E
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA.
Phys Rev Lett. 2001 Mar 26;86(13):2826-9. doi: 10.1103/PhysRevLett.86.2826.
Vapor quenching in the phase-separating Ag-Ni system creates alloys that appear homogeneously amorphous under conventional probes. However, an atomic-level structural analysis based on extended x-ray absorption fine structures in combination with reverse Monte Carlo and molecular dynamics simulations demonstrates that these new phases are characterized by nonuniform, spinodal-like structures on an extremely fine scale. This heterogeneous nature of the structure is directly responsible for the unexpectedly low heat (and temperature) of crystallization observed in calorimetric measurements.
在相分离的银镍系统中进行气相淬火会生成在传统探测手段下看似均匀非晶态的合金。然而，基于扩展X射线吸收精细结构，并结合反向蒙特卡罗和分子动力学模拟的原子级结构分析表明，这些新相的特征是在极精细尺度上具有不均匀的、类旋节线结构。这种结构的非均匀性质直接导致了量热测量中观察到的意外低结晶热（和温度）。
