A new constitutive analysis of hexagonal close-packed metal in equal channel angular pressing by crystal plasticity finite element method

Hejie Li, Tokyo Metropolitan University, Griffith University, Queensland University of Technology, University of Wollongong, Defence Materials Technology Centre, Defence Science and Technology Group
Andreas Öchsner, Griffith University
Prasad K D V Yarlagadda, Queensland University of Technology
Yin Xiao, Queensland University of Technology
Tsuyoshi Furushima, Tokyo Metropolitan University, University of Tokyo
Dongbin Wei, University of Technology Sydney
Zhengyi Jiang, University of Wollongong
Kenichi Manabe, Tokyo Metropolitan University

Li, H., Ochsner, A., Yarlagadda, P. K. D. V., Xiao, Y., Furushima, T., Wei, D., Jiang, Z. & Manabe, K. (2018). A new constitutive analysis of hexagonal close-packed metal in equal channel angular pressing by crystal plasticity finite element method. Continuum Mechanics and Thermodynamics, 30 (1), 69-82.

Abstract

Most of hexagonal close-packed (HCP) metals are lightweight metals. With the increasing application of light metal products, the production of light metal is increasingly attracting the attentions of researchers worldwide. To obtain a better understanding of the deformation mechanism of HCP metals (especially for Mg and its alloys), a new constitutive analysis was carried out based on previous research. In this study, combining the theories of strain gradient and continuum mechanics, the equal channel angular pressing process is analyzed and a HCP crystal plasticity constitutive model is developed especially for Mg and its alloys. The influence of elevated temperature on the deformation mechanism of the Mg alloy (slip and twin) is novelly introduced into a crystal plasticity constitutive model. The solution for the new developed constitutive model is established on the basis of the Lagrangian iterations and Newton Raphson simplification.