Atomic structure of Mg-based metallic glass investigated with neutron diffraction, reverse Monte Carlo modeling and electron microscopy.
作者： Rafał Babilas , Dariusz Łukowiec , Laszlo Temleitner
DOI: 10.3762/BJNANO.8.119
关键词:
摘要: The structure of a multicomponent metallic glass, Mg65Cu20Y10Ni5, was investigated by the combined methods neutron diffraction (ND), reverse Monte Carlo modeling (RMC) and high-resolution transmission electron microscopy (HRTEM). RMC method, based on results ND measurements, used to develop realistic model quaternary alloy in glassy state. calculated consists random packing atoms which some ordered regions can be indicated. amorphous also described peak values partial pair correlation functions coordination numbers, illustrated types cluster packing. N = 9 clusters correspond tri-capped trigonal prisms, are one Bernal’s canonical clusters, atomic with 6 12 suitable for octahedral icosahedral configurations. nanocrystalline character after annealing studied HRTEM. selected HRTEM images were processed inverse Fourier transform analysis. high-angle annular dark-field (HAADF) technique determine phase separation glass heat treatment. HAADF mode allows observation randomly distributed, dark contrast about 4–6 nm. interplanar spacing identified orthorhombic Mg2Cu crystalline is similar value first shell radius from short-range order.
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