Crystallographic texture effect on statistical microvoid growth in heterogeneous polycrystals

Abstract

Polycrystalline materials usually exhibit obvious preferred grain orientations (i.e., crystallographic texture) after rolling and heat treatments, leading to a certain crystalline anisotropy. However, most previous studies on microvoid growth generally treated the material as homogeneous isotropic matrix, ignoring the influence of crystallographic texture. In the present work, four typical crystallographic textures of face-centered cubic crystal are considered, including the Cube, Goss, Brass and Copper textures. Afterwards, the texture effect on microvoid growth is systematically studied by crystal plasticity finite element simulation, from a statistical point of view. In addition, the role of loading mode (i.e., uniaxial or biaxial tension) in the texture effect on microvoid growth has also been explored. The results indicate that the crystallographic texture evidently affects the statistical void growth in heterogeneous polycrystals, regardless of the loading mode. Meanwhile, it has been found that the statistical void growth of Cube (resp. Brass) texture is always slower (resp. faster) than that of random grain-orientation case. Furthermore, it is interestingly concluded that for the four considered textures, the trend of statistical void growth (from fast to slow) is well consistent with that of average flow stress (from high to low) at any given strain level, which cannot be captured by the classical Rice-Tracey model. Finally, based on the statistical characteristics of void growth for different textures, a statistical Rice-Tracey model incorporating the texture effect is established. It is demonstrated that this statistical model can well envelop all the dispersed void growth results of different textures for the uniaxial tensile loading.