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Article Dans Une Revue Journal of Molecular Catalysis A: Chemical Année : 2010

On the atomic structure of Zr-Ni and Zr-Ni-Al metallic glasses

Résumé

Using real space pair distribution functions derived from high precision x-ray diffraction data, the local atomic structure of Zr-Ni and Zr-Ni-Al metallic glasses was investigated. Unlike Zr-Cu metallic glasses, the structure of Zr-Ni metallic glasses cannot be approached with an ideal solution model, due to strong attractive interactions between Zr- and Ni atoms, which promote chemical short range order. Addition of Al can be beneficial for the glass forming ability of Zr-Ni metallic glasses. The atomic size of Al, being intermediate to those of Zr- and Ni and the strongly attractive interactions between Zr-Al and Zr-Ni atoms can lead to highly negative volumes of mixing Delta V/(mix), and to denser atomic structures, reduced atomic mobility in the liquid and easier suppression of crystallization in the undercooled liquid state
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Dates et versions

hal-00517325 , version 1 (14-09-2010)

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K. Georgarakis, A.R. Yavari, M. Aljerf, D.V. Louzguine-Luzgin, M. Stoica, et al.. On the atomic structure of Zr-Ni and Zr-Ni-Al metallic glasses. Journal of Molecular Catalysis A: Chemical, 2010, 328 (1-2), pp.7. ⟨10.1063/1.3446131⟩. ⟨hal-00517325⟩
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