Phenomenological Study of the Size Effect on Martensitic Transformation in Nanograined Powders

摘要

On the basis of the Landau-Ginzburg models established by Falk and other authors, a new model for martensitic transformation in nanograined powder is developed, in which the influence of the interface on martensitic transformation in nanograined powder is considered. The interface strain coefficient K, the factor describing the difference of the strain between the interface and the core of a nano-grain, was suggested in this paper. The equation in the present model was solved numerically, and the size effect was observed. The calculation results show that the critical size increases with the drop in temperature, which means that the lower temperature will promote martensitic transformation in nanograined materials.