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

• DOI: 10.1016/j.jallcom.2017.02.262
• Publication Date: 2017-02-25T03:17:00Z
• Authors: Peiji Geng; Weiguo Li; Xianhe Zhang; Yong Deng; Haibo Kou; Jianzuo Ma; Jiaxing Shao; Liming Chen; Xiaozhi Wu
• Keywords: Anomaly (physics); Base (topology)

Abstract 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.