Effect of Re content on the γ/γ′ interface: A Monte Carlo simulation

• The work predicts the γ/γ′ interface structure with Monte Carlo simulations.
• Results indicate that Re atoms preferentially occupy the Al sites in γ′ precipitates.
• The influence of Re content on the interface characteristics are determined.
• The solubility limit of Re solute in γ′ precipitates is provided.

In the present paper we have studied the γ/γ′ interface structure and the influence of Re content on the interface characteristics with Monte Carlo simulations. The results indicate that Re atoms preferentially occupy the Al sites in γ′ precipitates and integrate with its nearest neighbor Ni atoms, which is consistent with previous first principles calculations. It is also found that there is no enrichment of Re in the γ/γ′ interface. The extraordinary creep strengthening effect of Re is due to its intrinsic solid solution strengthening that Re atoms inhibit the dislocation movement in γ phase. The effects of temperature and Re concentration variation on γ/γ′ interface have been measured. The solubility limit of Re solute in γ′ precipitates as a function of temperature is also provided.