Abstract
Phase modifications induced at low temperature ( T ≤ 40 K) in Al 3Ti by ion irradiation were investigated by in situ transmission electron microscopy (TEM). Irradiation with heavy ions induces a complete amorphization at a dose of approximately 1 dpa. After partial chemical disordering, a crystalline phase change from the DO 22 structure into the L1 2 structure is observed only after the onset of amorphization. These results suggest that a lattice strain release is produced by the amorphization process allowing the transition towards a higher symmetry phase. On the other hand, light ion irradiation leads to partial chemical disordering and to strong lattice distortions, but the transition c-a is not completely achieved at doses higher than 2 dpa.
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