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The crystal plasticity finite element method (CPFEM) is used to investigatethe coupling between the cylindrical void growth or collapse and grainrefinement in face-centered cubic (FCC) single crystals. A 2D plane strainmodel with one void is used. The effect of the initial lattice orientation,similarities, and differences between stress- and strain-driven loadingscenarios are explored. To this end, boundary conditions are enforced in twodifferent ways. The first one is based on maintaining constant in-plane stressbiaxiality via a dedicated truss element, while the second one is imposing aconstant displacement biaxiality factor. Uniaxial and biaxial loading cases arestudied. For the uniaxial loading case a special configuration, which enforcesan equivalent pattern of plastic deformation in the pristine crystal, isselected in order to investigate the mutual interactions between the evolvingvoid and the developed lattice rotation heterogeneity. Next, biaxial loadingcases are considered for three crystal orientations, one of which is notsymmetric with respect to loading directions. It is analysed how stress orstrain biaxility factors and initial lattice orientation influence the voidevolution in terms of its size and shape. Moreover, the consequences ofvariations in the resulting heterogeneity of lattice rotation are studied inthe context of the grain refinement phenomenon accompanying the void evolution.Scenarios that may lead to more advanced grain fragmentation are identified.

Cylindrical void growth vs. grain fragmentation in FCC single crystals: CPFEM study for two types of loading conditions