Study on the effect of elastic strain energy on the ordering process of Ni-Al alloy by phase-field

Using the phase-field microelasticity model, we studied the effect of elastic strain energy (ESE) resulted from the precipitation misfit on the ordering process of γ' (Ni ₃Al) phase. The simulation results show that ESE always presents impediment effect for different precipitation mechanisms, such as non-classical nucleation, the mixed style of non-classical nucleation and spinodal decomposition, spinodal ordering; and slows down the occupation probability (OP) of Al atom at β site, and impedes the ordering process. At the same time step, the height and the width of the concentration and long-range order parameter (LROP) are small in the system involving ESE.ESE changes the spatial arrangement and microstructure, and leads to the preferred orientation microstructure.