Irradiation induced defects in deformed Ni₃Ge and Ni₃Al single crystals

In situ observation of superdislocation motion in pre‐strained Ni3Ge single crystals

“…10. The former contrasts are antiphase boundary (APB) tubes decorated by electron irradiation as reported previously (Murakumo et al ., 2000b). The latter contrasts are of non‐planar dislocations.…”

“…As dislocations were introduced in the first step deformation to act as forest dislocations in the second step deformation, the absence of APB tubes suggests that the tubes might not be formed by usual dislocation–dislocation interaction as considered in the Vidoz–Brown mechanism (Vidoz & Brown, 1962). A straight APB tube can be formed by kink motion (Shi et al ., 1996; Murakumo et al ., 2000b). These observations together with the stress–strain relations shown in Fig.…”

“…11. On the other hand, when cube slip becomes predominant at higher temperatures the anomalous strengthening disappears and APB tubes appear on the flat cube planes (Murakumo et al ., 2000b). Evolution of the anomalous strengthening up to high temperatures for the [100] stress axis, then, means that formation of APB tubes is not essentially related to the strengthening.…”

Crystallographic features of oriented nanocrystals induced by focused-ion-beam irradiation of an amorphous alloy

“…So far, numerous kinds of structural changes in materials as a result of ion/electron beam irradiation have been reported, such as the precipitation of an implanted ion, 1,2 formation of dislocation loops, [3][4][5] formation of point defect clusters, 6,7 phase transformation from a crystalline into an amorphous structure 8,9 and vice versa. 10,11 Similar to these irradiations, focused-ion-beam ͑FIB͒ irradiation also introduces irradiation damages into materials.…”