Abstract
The Laves phase TiCr 2 is readily amorphized by 1 MeV krypton irradiation at temperatures below about 250 K. However, with continuing irradiation the glassy phase (a-TiCr 2) gradually transforms to a metastable bcc structure without measurable change of local composition. The results of direct observations of migrating a-TiCr 2/bcc interfaces at temperatures in the range 80–180 K yield an effective activation energy of 0.027 eV for the interface velocity. A model for this irradiation-induced phase transformation is discussed in terms of dynamic reconstruction within displacement cascades. The phenomenon has been termed “cascade-driven migration of structural interfaces”.
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