Atomic motions in the crystalline Al50Cu35Ni15alloy

Authors: Dahlborg U.1; Howells W.S.2; Calvo-Dahlborg M.1; Dubois J.M.1

Source: Journal of Physics: Condensed Matter, Volume 12, Number 17, 2000 , pp. 4021-4041(21)

Publisher: Institute of Physics Publishing

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Abstract:

This paper describes quasi-elastic neutron scattering experiments on the Al50Cu35Ni15 alloy performed on the IRIS spectrometer at ISIS, Rutherford Appleton Laboratory, and on the MIBEMOL spectrometer at Laboratoire L?on Brillouin, Saclay. The aim was to investigate if atomic hopping motions are restricted only to occur in systems with quasicrystalline local order. It is found that frequent jumps of Cu and Ni atoms between different interstitial lattice positions on the time scale 1 to 100 ps are taking place in this alloy at high temperature. This is the same time scale that has been found earlier in quasicrystals and it suggests that this kind of motion is likely to take place in any metallic alloy at high temperature and that it is not a special property of quasicrystals.

Language: English

Document Type: Miscellaneous

Affiliations: 1: LSG2M-UMR 7584, CNRS-INPL, Centre d'Ing?ni?rie des Mat?riaux, Ecole des Mines, Parc de Saurupt, 54042 Nancy, France 2: Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK

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