Abstract
The relative changes in the interference and distribution functions of the amorphous Ti 61Cu 16Ni 23 and Ti 62.5Cu 12Ni 23Si 2.5 alloys due to relaxation annealing have been measured. MoK α radiation has been used. A curved graphite monochromator has been located in the diffracted-beam path. The results imply a topological short-range order increase represented by a small collective rearrangement of atoms including the nearest neighbours without a long-distance diffusion. The excess free volume disappears at the same time. A more detailed analysis based on the decomposition of two radial distribution functions into Gaussians has shown that the complexes of two or more icosahedra connected through a common vertex with Ti atoms in their centres are present in the as-quenched structure. During the relaxation annealing these complexes decompose into isolated and more regularly shaped icosahedra. The conclusions are supported by the changes of a prepeak which is present in the interference functions.
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