Athermal resistance to phase interface motion due to precipitates: A phase field study

Athermal resistance to the motion of a phase interface due precipitate is investigated. The coupled field and elasticity equations are solved for transformation (PT). volumetric misfit strain within included using error rectangular functions. Due presence precipitates, critical thermal driving forces (athermal friction) remarkably differ between direct reverse PTs, resulting in hysteresis behavior. For many cases, force increases like c x , =0.5-0.6, vs. concentration both PTs. This similar 0.5 known effect solute atoms on athermal friction, which also dilation centers, but without surface energy. Change (40% reduction) energy during PT significantly changes morphology forces. radius small compared width, does not practically show any force. In opposite case, constant (CSE) variable (VSE) boundary conditions (BCs) at surface, linearly while it almost independent PT. concentration, VSE BCs result higher forces, smaller range, larger rate. obtained microstructure validated thermodynamic equilibrium condition stationary interfaces. Increase width reduces interphase friction. After neglecting change energy, our simulations describe well Zener pinning pressure grain boundary. results give an important generic understanding friction mechanism interfaces various PTs nanoscale.