A study of plastic deformation behavior during high pressure torsion process by crystal plasticity finite element simulation

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Wei, P.T.^1 ; Lu, C.^1 ; Tieu, K.^1 ; Deng, G.Y.^1

School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia^1

关键词: Critical resolved shear stress;    Crystal plasticity finite element;    Crystal plasticity finite element methods (CP FEM);    High pressure torsions;    Orientation changes;    Plastic deformation behavior;    Small grain size;    Ultrafine grained materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012045/pdf
DOI  :  10.1088/1757-899X/63/1/012045

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

High pressure torsion (HPT) is an efficient technique of producing ultrafine grained materials with exceptional small grain size. In this study, a crystal plasticity finite element method (CPFEM) model has been developed to investigate the plastic deformation behavior of pure aluminum single crystal during the HPT process. The simulation results show that, the distribution and evolution of the macroscopic plastic strain and the accumulative shear strain are similar. The value increases with the increase of the distance from the center as well as the number of revolution. The simulation is capable of reflecting the anisotropic characteristics of HPT deformation, a non-homogenous deformation along the circumference of the sample could be observed. At the early stage of HPT deformation, the critical resolved shear stress (CRSS) along the radial direction presents a rapid increase, followed by a moderate increase and then reaches the near-saturate state. As the HPT deformation proceeds, there is a relatively weak increase in the quasi-saturate value and the near-steady region expands gradually towards the sample center. The orientation changes during the HPT process with increasing applied strain predicted by the developed CPFEM model are also presented.