Study Of The Deformation In A Mg-Y Alloy Using A Fast Fourier Transform Based Spectral Solver

The addition of Yttrium in Magnesium leads to yield strength and ductility improvement.However,the mechanisms explaining that phenomenon remain unclear,and creating a model that simulates the deformation behavior would give a better understanding of the role of Yttrium.In this paper,a spectral solver using a crystal plasticity fast Fourier transform method(CPFFT)is employed to simulate the grain scale deformation behavior in a Mg-3wt%Y alloy during an in situ tensile experiment.The simulation result is compared with the experimental results obtained during the in situ test.The CPFFT successfully predicts the tensile stress-strain curve,and it also predicts the orientation change and stress evolution of individual grains at different load steps.The model is more efficient than a dislocation-based elastic viscoplastic self consistent(EVPSC)model in predicting the crystal rotation and stress in many selected grains.Finally,possible reasons to explain the model's underestimation of stress and orientation,when they are compared to the experimental measurements,are discussed.