Model for Forecasting Temperature Dependence of γ/γ' Misfit in Heat-Resistant Nickel Alloys

摘要

An analytical model for forecasting the temperature dependence of gamma/gamma' misfit in heat-resistant nickel alloys is proposed. The model accounts for the concentration dependences of the periods of crystalline lattices of the gamma and gamma' phases (Vegard law), thermal expansion of the gamma and gamma' lattices, and dissolution of the gamma' phase at high temperatures. Adequacy of calculations of misfit is confirmed by comparison with the results of measurements using methods of X-ray and neutron diffraction. The model is applied for development of a nickel alloy with positive misfit.