Abstract
Comparison of lattice strains in crystals of various orientations is a primary method of validating polycrystal plasticity simulations. These strains can be measured using in situ neutron diffraction experiments while the corresponding information can be extracted from the simulation results. If the single crystal elastic moduli—particularly the anisotropy of the moduli with respect to lattice direction—are not accurately known, simulations cannot provide a favorable comparison to experiments. Previous work simulating deformation of an aluminum alloy with significant magnesium content (AA-5182) revealed that consistency with the experiments required a higher degree of anisotropy in the elastic moduli in the finite element simulations than that typically reported for pure aluminum. We undertook the current research to determine if the magnesium content causes that larger single crystal elastic anisotropy. Using in situ loading, we measured lattice strains and determined diffraction moduli of materials covering a range of magnesium content. The results show measurable influence of composition on elastic anisotropy.
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