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-  2018 


DOI: 10.11951/j.issn.1005-0299.20170362

Keywords: Al基金属玻璃,玻璃形成能力,电子结构,伪布里渊区,费米面

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In order to reveal the effect of Ni and Y on the glass forming ability (GFA) of Al-Ni-Y ternary alloy system, two conclusions are drawn based on the Fermi sphere-Brillouin zone interaction and spectroscopy experiments: firste the effect of Ni is influenced by the electron hybridization between Al atom and Ni atom, changing the diameter of the Fermi sphere (2KF); second the effect of Y element mainly changes the diameter of the pseudo-Brillouin zone (KP). Their effects on the Fermi level and Brillouin zone size were obtained by the EELS (electron energy-loss spectra), XPS (x-ray photoelectron spectroscopy) and XRD (x-ray diffraction). Research results showed that the static structure changes of Al atoms and Y atoms influenced the diameter of the pseudo-Brillouin zone. The best GFA could be obtained when the Fermi surfaces nearly touched the quasi-Brillouin boundaries. On this basis, the δ=|KP-2KF| criterion was proposed to evaluate the GFA of Al-Ni-Y ternary alloy. This criterion was confirmed by the experimental results.


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