Two dimensional kinetic transformation of graphite-diamond by phase field simulation

Abstract

Graphite and diamond are well known allotropes of carbon, which shows extremely different properties. Eventhough these allotropes have been widely used and studied, however only few I references concern on the kinetic transformation of these allotropes can be obtained. Therefore the present research try to investigate the kinetic transformation of graphite-diamond by phase-field simulation approach. Simulations have been performed at different pressure conditions, with the driving force for the transformation is the undercooled temperature as compared to the transformation temperature for each pressure condition. For this purpose, two mathematical models have been developed, the first is for the field variable transformation that govern the interface movement during the transformation. The second is model for the heat conduction evolution that couple the phase transformation. Instead of presenting the results in one dimensional data, the present research presents the data in the form of two dimensional form. Therefore the data can illustrate the condition of diamond coating with graphite as the precursor material. The resulting data are compared with the previous research on the kinetic transformation of graphite-diamond.