Microstructure Simulation of Al alloy with a Modified Cellular Automaton Method
A stochastic model for simulating the microstructure formation of Al－4.5Cu alloy during solidification has been developed, based on the finite element method(FEM) for macroscopic model of heat transfer calculation and a modified Cellular Automaton (mCA) for microscopic modeling of nucleation, growth of crystal. In this model, the effect of solute redistribution, interface curvature and preferred orientation was considered. A new probabilistic neighborhood configuration was adopted to neglect the influence of continuous nucleation. A numerical simulation was developed with C++. The computation was carried out to understand the effect of nucleation parameters on the microstructure formation, and then displayed on screen. The mould can simulate the formation of the microstructure of columnar grain, equiaxed grain and the transformation process from columnar to equiaxed grain (CET). The effects of ΔTv,ma and nv on the microstructure. The degree of undercooling (ΔTv,ma) determines the columnar, CET and equiaxed solidification. The value of nucleation density (nv) also has a significant effect on the equiaxed grain size. Low nucleation of undercooling with large maximum nucleation site number leads to a fine and fully equiaxed microstructure. Increased heat transfer coefficient gives fine grains which are more equiaxed. The program which developed by ourselves has the advantage fast and accurate in evaluation of solidification microstructure.
Cellular automaton Al alloy Stochastic model Nucleation Grain growth
Yu Yingxia He Buolin Qi Qingyan
School of Mechanical & Electrical Engineering, East China Jiaotong University, Nanchang 330013,China
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）