ABSTRACT
The electron-irradiation induced amorphous transition at dislocations has been examined in NiTi using a 3 MV ultra-high voltage electron microscope. The preferential amorphous transition at dislocations is observed over a temperature range from 250 to 275 K. In the beginning stages of irradiation, dislocations undergo non-conservative motion over a short distance. With continued irradiation, cylinders of an amorphous phase are produced along individual dislocation lines. The cylinders grow laterally with further irradiation and eventually coalesce into one body. In this manner, the whole irradiated volume is completely converted into the amorphous state.
