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Medium-Range Order Structure and Fragility of Superheated Melts of Amorphous CuHf Alloys |
| BIAN Xiu-Fang;SUN Bao-An;HU Li-Na |
| Key Laboratory of Liquid Structure and Heredity of Materials of Ministry of Education, Shandong University,
Jinan 250061 |
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| Cite this article: |
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BIAN Xiu-Fang, SUN Bao-An, HU Li-Na 2006 Chin. Phys. Lett. 23 1864-1867 |
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Abstract The structural factors of amorphous CuHf alloys at different temperatures are determined by using a high temperature x-ray diffractometer. It is found that not only the short-range order structure but also the medium-range order structure exists in amorphous CuHf alloys. The dynamic viscosities of CuHf alloy melts are measured by a torsional oscillation viscometer. The fragility of superheated melts of CuHf alloys is calculated based on the viscosity data. The experimental results show that the glass-forming ability of the CuHf alloys is closely related to the fragility of their superheated melt. The relationship between the medium-range order structures and the fragility of superheated melts has also been established in amorphous CuHf alloys. In contrast to the fragility of supercooled liquids, the fragility of superheated liquids promises a better approach to reflecting the dynamics of glass forming liquids.
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| Keywords:
61.20.-p
61.25.Mv
81.05.Kf
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Published: 01 July 2006
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| PACS: |
61.20.-p
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(Structure of liquids)
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61.25.Mv
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(Liquid metals and alloys)
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81.05.Kf
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(Glasses (including metallic glasses))
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