Abstract
Electron irradiation effects on phase stability of the E (Al18Cr2Mg3) phase have been investigated by high-angle annular dark-field scanning transmission electron microscopy and high-resolution transmission electron microscopy (HRTEM). The in situ HRTEM observations show that the Al18Cr2Mg3 particles with different thickness undergo amorphization and dissolution under 300 keV electron irradiation at 25 °C. The results indicate that the intermetallic compound Al18Cr2Mg3 is unstable under electron irradiation, and structural changes mainly depend on the thickness of particles. Amorphization in the thick particles is caused by a combination of chemical disordering and an increase in point defect concentration. Dissolution after amorphization in the thin particles is attributed to the diffusion of point defect towards the Al matrix.
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