3-D Simulation For Dendritic Grain Evolution In Solidification Processes Of Binary Alloys

The dendritic evolution during solidification process of binary alloys is investigated by numerical simulation technique. A 3DMicrosCA model, considering coupled temperature field, concentration field and phase field, has been built to investigate the solidification process of binary alloys from different scales. This work helps to understand the solidification microstructure, and also provides a theoretical reference to control the morphology of microstructure.The paper includes the following five parts, which are:1) A 3DMicrosCA model, taking direct difference method, Monte Carlo method and Oriented-object method into account, is built on the basis of the previous 2D model. This model describes the general idea of 3D cellular automata, which is very supportive theoretically and methodologically for the microstructure modeling.2) Specifically, a 3DMicrosCA-Solidification model is built based on the above-mentioned 3DmicrosCA model. This model, with the application of a deterministic model and a stochastic model, and, a macro model and a micro model, is the instantiation of metal solidification theories.3) Based on this 3DMicrosCA-Solidification model and together with the post-processing software, a 3DMicrosCA-Solidification simulation software is developed to carry out the real-time calculation and visualization of 3D binary alloy microstructure solidification evolution and hence provide with a virtual laboratory for the study of microstructure solidification evolution.4) Another CA model (Nastac method) is used to simulate evolution process of single or multi dentrite in 2D.5) A series of computer simulation have been done to binary alloys. By theoretical analysis and, with the comparison to simulation and experimental results of authorative scholars, this 3DMicrosCA model under certain circumstances has been proved to be reliable and accurate.