A new set of physically-based unified viscoplastic constitutive equations for superplastic deformation of Al-Zn-Mg-Cu alloy. (July 2022)

• Record Type: Journal Article
• Authors: Li, Guangyu; Ding, Hua; Wang, Jian
• Is Part Of: Mechanics research communications. Volume 123(2022)
• Publication Date: 2022-07
• Subjects: Al–Zn–Mg–Cu alloy -- Constitutive equation -- Superplasticity -- Damage -- Crystal plasticity; Mechanics, Applied -- Periodicals; Mécanique appliquée -- Périodiques; Mechanics, Applied; Periodicals; 530
• DOI: 10.1016/j.mechrescom.2022.103904
• Languages: English
• ISSNs: 0093-6413

Abstract

Highlights: A new set of mechanism-based unified viscoplastic constitutive equation of Al-Zn-Mg-Cu alloy has been proposed. The new damage evolution equation considered the critical strain of cavity nucleation. The set of constitutive equations have been coupled into crystal plasticity finite element method(CPFEM). CPFEM combined innovatively with the unified viscoplastic constitutive equation. Abstract: A new set of physically-based unified viscoplastic constitutive equations using internal state variable(ISV) method during the superplastic deformation of Al-Zn-Mg-Cu alloy at temperatures ranging from 480 to 530 ℃ and strain rates ranging from 3×10 −4 s −1 to 3×10 −3 s −1 has been proposed. The damage evolution equation in this set of constitutive equations takes into account the critical cavity nucleation strain. This set of constitutive equations can predict microstructure evolution and flow stress during superplastic deformation of the investigated Al-Zn-Mg-Cu alloy. The set of constitutive equations have been coupled into crystal plasticity finite element method for determining the evolution of grain size and cavity volume fraction and the lattice rotation field map. The Material parameters are determined by genetic algorithm. The influences of strain, strain rate and temperature on grain size evolution and cavitation behavior were analyzed. The predicted stress-strain behavior, grain size and damage evolution are in good agreements with the experimental results.