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Coupling of nano-indentation and crystal plasticity finite element (CPFE)simulations is widely used to quantitatively probe the small-scale mechanicalbehaviour of materials. Earlier studies showed that CPFE can successfullyreproduce the load-displacement curves and surface morphology for differentcrystal orientations. Here, we report the orientation dependence of residuallattice strain patterns and dislocation structures in tungsten. Fororientations with one or more Burgers vectors close to parallel to the samplesurface, dislocation movement and residual lattice strains are confined tolong, narrow channels. CPFE is unable to reproduce this behaviour, and ouranalysis reveals the responsible underlying mechanisms.

Orientation dependence of the nano-indentation behaviour of pure tungsten