Abnormal Grain Growth: Effect of Disperse Particles

Resumo

Problems arising due to abnormal grain growth, the main of which concerns determination of the start and end of this process in materials with various initial microstructures and the behavior of disperse particles, are considered. Grain growth is studied by the method of numerical simulation. A pioneer diagram presenting the conditions of development and suppression of abnormal grain growth at a fixed rate of dissolution of particles is plotted in the “initial grain size – initial retarding force” coordinates. The causes of abnormal grain growth in nanocrystalline materials are analyzed, of which the principal one is supposed to be the presence of submicroscopic pores. The results obtained are used to develop novel methods for controlling the grain structure in various structural and functional materials.