Role of crystallographic orientation on intragranular void growth in polycrystalline FCC materials

In this work, we study the effect of crystallographic orientation and applied triaxiality on growth intragranular voids. Two 3D full-field micromechanics methods are used, dilatational visco-plastic fast-Fourier transform (DVP-FFT) crystal plasticity Finite Elements (CP-FE), both which incorporate a combination crystalline plasticity. We demonstrate with several select cases that predictions void from formulations agree qualitatively. With more computationally efficient DVP-FFT, additional effects polycrystalline microstructure influence nearest neighborhood investigated. Crystals bearing single intracrystalline studied in three types microstructural environments: isolated crystals, individual equal-sized grains within regular polycrystal, variable sized polycrystal voids randomly located. show loading type plays significant role. strain-rate controlled conditions, hardest [111]-crystals grow fastest time, whereas stress-controlled softest [100]-crystal time. The analysis reveals average is slower for same starting than crystal. find at highest tested correlation between rate strengthens, drawing closer to seen crystals. These results model can help guide design materials high strength damage-tolerance high-rate deformation.