1 Department of Wind Energy, Technical University of Denmark 2 Composites and Materials Mechanics, Department of Wind Energy, Technical University of Denmark 3 Materials science and characterization, Department of Wind Energy, Technical University of Denmark 4 Department of Mechanical Engineering, Technical University of Denmark 5 Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark
A computational model of ultrafine grained (UFG) or nanostructured titanium (Ti), based on a finite element (FE) unit cell model of the material and a dislocation density based model of plastic deformation has been developed. FE simulations of tensile deformation of UFG Ti with different fractions and properties of the grain boundary (GB) phase have been carried out. The effect of different degrees of deviation from the equilibrium state of the grain boundaries (GBs) on the mechanical behaviour of nanostructured Ti have been investigated using the combined composite/dislocation dynamics based model. In particular, the effects of different diffusion coefficients in the GB phase, of a high initial dislocation density in the grain boundaries, as well as of atomic scale precipitates are investigated for affecting the deformation behaviour of UFG or nanostructured Ti. © 2013 Elsevier B.V. All rights reserved.
Computational Materials Science, 2014, Vol 83, p. 318-330
Diffusion; Finite element method; Plastic deformation; Titanium; Grain boundaries
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