Abstract
The three polymorphs of Al 2SiO 5 (kyanite, andalusite and sillimanite) were irradiated with 1.5 MeV Xe + using the HVEM-Tandem Facility at Argonne National Laboratory. Irradiations were completed over a temperature range of 300 to 973 K. In situ TEM, followed by HREM, was used to characterize the effects of the ion beam damage. All three Al 2SiO 5 polymorphs became amorphous after doses of 0.3 dpa at room temperature. However, the high temperature behavior of the three phases was different. The thermodynamic stabilities of the three phases were found not to have a direct relation to susceptibility to amorphization. Irradiation-induced amorphization is discussed in terms of a cascade quenching model.
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