A theoretical model for yield strength anomaly of Ni-base superalloys at elevated temperature

In this study, the temperature-dependent antiphase boundary energy is established from a view of energy conservation. Subsequently, a theoretical model for yield strength anomaly of Ni-base superalloys at elevated temperature is developed on the basis of pre-existing yield strength model and traditional precipitation strengthening theories. The model is verified at different temperatures by comparison with experimental data of several Ni-base superalloys. The excellent agreement between predictions and experiments shows a good prediction ability of this model. This study provides a quantitatively theoretical characterization method for yield strength anomaly of Ni-base superalloys at elevated temperature. (C) 2017 Elsevier B.V. All rights reserved.