Pore evolution regulation in synthesis of open pore structured Ti–Al intermetallic compounds by solid diffusion

A method based on diffusion model simulation and calculation was used to discuss the pore evolution regulation of porous Ti–Al intermetallic compounds. According to the basic structure characteristics of Ti–Al compacts, a sandwich core–shell structured powder diffusion couple model and two pore evolution conditions were used to reveal the pore evolution regulations in Ti–Al porous alloy, which is mainly caused by the Kirkendall effect. The growth of the pore evolution layer is consistent with the consumption of the initial Al shell, and the dimension of the pore evolution layer is independent on the dimension of the core of Ti particle. An equation reflecting the evolution porosity and the physical parameters of diffusion components was established. The evolution porosity was confirmed to be a function of the concentration and density of diffusion elements.