Gas pressure

overheat and solidification velocity are the most important parameters influencing the final structure of the lotus-type porous metal which is prepared by metal-gas eutectic directional solidification process（Gasar）.A three-dimensional time-dependent model was developed to describe the heat transfer

mass transfer

gas pore nucleation

growth and merging as well as synergistic growth with solid phase during the formation process of lotus-type porous structure.Corresponding computation program was developed to simulate the porous structure formation and evolution during Gasar solidification by using the finite difference methods to understand the influence of gas pressure and solidification velocity on porous structure of lotus-type metal.The simulated structural parameters such as average pore diameter and porosity of Mg-H system have a well agreement with the corresponding experimental ones

which reveals that the developed model is feasible in structural simulation of lotus-type porous metals.