Abstract
The role of icosahedral order in glass formation from metallic melts is examined from two distinct standpoints. On the one hand, experimental evidence is reported that icosahedral order indeed occurs in liquid alloys which produce quasi-crystals upon solidification. In contrast, an example is shown in which no icosahedral order is detectable although the material freezes in the amorphous state. On the other hand, computer simulations are used to show how a network of two kinds of particle may become amorphous though no icosahedral order is present. It is suggested that icosahedral order is not necessarily related to disordering in amorphous alloys and that its long-standing status as universal criterion for glass formation should be reconsidered.
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