화학공학소재연구정보센터
Materials Science Forum, Vol.378-3, 186-191, 2001
Modeling the texture development of two-phase composites by considering intra-crystalline misorientation
Taylor and Self Consistent (SC) models have been quite successful in modeling texture development of plastic materials. Some n-Sites Self Consistent models are able to consider elastoviscoplastic interactions among a few regions of a poly-crystal that can be alternatively identified with different crystallites or fractions of a unique crystal. Moreover, subdivision of a sample, following the rules of Finite Element Methods (FEM), allows to consider different levels of heterogeneity. Micromechanical SC models embedded on FEM techniques belong to a kind of models that can become as computer time consuming as needed by the level of details required to them. The current paper shows an approach that is capable of keeping the advantages of small scale computer simulations together with a reasonable agreement with experimental data. Considering a strong interaction between two closest neighbors, enforced as co-spin (rotation rate) between them, it is possible to generate intra-grain misorientations in close resemblance with transmission and scanning electron microscopy results. The model is used to simulate a large collection of texture results obtained by neutron diffraction of different combinations of codeforming metals under different test conditions. Results are shown for Al-Cu system processed following harmonics and WIMV analysis and they are compared with simulations. The model is quite able to reproduce many of the small features and severities of experimental textures. Two-phase co-deforming composites are shown to be a kind of materials with a level of heterogeneity still tractable by micromechanical models.