Abstract
The short-range order and crystallization behavior of slowly cooled Zr 62− x Ti x Al 10Cu 20Ni 8 bulk metallic glasses have been investigated in terms of the atomic pair correlation function as a function of Ti content x (2≤ x≤7.5). The structural parameters point to the presence of chemical short-range order in these bulk glasses. An enhanced local excess free volume around the Ti atoms is concluded from density measurements. The first stage of crystallization in Zr 62− x Ti x Al 10Cu 20Ni 8 bulk glasses is related to changes in the medium-range order while the first neighborhood is retained. The atomic pair correlation functions of the first crystallization products are similar for all titanium contents. There is no indication of any special atomic arrangement for the particular alloy forming quasicrystals upon heating ( x=3). In case of Zr 54.5Ti 7.5Al 10Cu 20Ni 8 an ultrafine microstructure consisting of clusters of 2 nm in size is formed as the first step of crystallization.
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