A contribution to the modelling of creep behaviour of FCC metals

Abstract

In this paper, a new modelling is proposed to describe the viscoplastic behaviour of face-centred cubic (FCC) metals. Creep tests under various conditions were performed. The material chosen to test the model is Al-1050. The plastic deformation is controlled by intragranular diffusion when the test temperature exceeds $0.4T_{m}$. The developed model involves two state variables related to the microstructure: dislocation density and subgrain size. The grain size is assumed to be constant in the intermediate temperature range. Validation tests were proposed to justify the reliability of the developed model in various loading conditions.

Keywords

• Creep
• Subgrain
• Strain hardening
• Dynamic recovery
• Viscoplasticity
• Intragranular diffusion