PSI - Issue 71

Gnaneshwar Sampathirao et al. / Procedia Structural Integrity 71 (2025) 484–491

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Fig. 3. Representation of Dislocations at maximum loading on Al single crystal with (100) orientation when T=~0K

Fig. 4. Evolution of the Friction coefficient for Aluminium single crystal scratch on (100) surface

3.2. Effect of Indentation Plane Fig. 5 presents the hardness values obtained from nanoindentation on single-crystal Al with a (110) orientation. Compared to the (100) orientation, change in hardness trends emerges at higher indentation velocities (0.4 – 0.6 Å/ps). Visualization of the dislocation evolution revealed that the (110) plane readily accommodates dislocation formation and movement. Table 1 summarizes the types of dislocations observed at (110) orientation. Partial dislocations, which are less common in the (100) orientation, appear frequently here. These dislocations contribute to the increased ductility and altered mechanical response. Hence, while the (100) plane shows relatively stable hardening characteristics, the (110) plane allows more complex dislocation dynamics, explaining the observed deviations in hardness at higher velocities.