Methods of deforming metals to large strains are reviewed and the process of equal channel angular extrusion is analysed in detail. The development of microstructure during large strain deformation is discussed, and it is concluded that the main criterion for the formation of a sub–micron grain structure is the generation of a sufficiently large fraction (> 0.7) of high–angle grain boundary during the deformation process. For aluminium alloys, it is found that a low–temperature anneal is required to convert the deformed microstructure into an equi–axed grain structure. The material, microstructural and processing factors that influence the formation of such fine–grain microstructures are discussed, and the stability of these microstructures at elevated temperatures is considered.

Developing stable fine-grain microstructures by large strain deformation - Discussion

Fully coupled poroelastic peridynamic formulation for fluid-filled fractures

A multiscale investigation into the effect of grain size on void evolution and ductile fracture: Experiments and crystal plasticity modeling

A CPFEM based study to understand the void growth in high strength dual-phase titanium alloy (Ti-10V-2Fe-3Al)

Predicting fracture evolution during lithiation process using peridynamics

Modelling of stress-corrosion cracking by using peridynamics

High strength aluminium alloys are widely used in aerospace components which are produced through forming and joining processes. The ductile failure in these metals occur due to the evolution and accumulation of microscopic defects, such as micro-voids and shear bands. Present work investigates the underlying physical mechanisms during ductile failure by performing a rigorous fully-validated three dimensional crystal plasticity finite element studies in aluminium alloy single crystals. Representative volume element (RVE) based simulations of single crystalline aluminium alloys (AA-5xxx) with different void geometries and orientations have been performed. Both local and nonlocal crystal plasticity constitutive models have been implemented in finite element framework and are used to seek new insights and interrelationship among void growth, initial porosity, initial void size, plastic anisotropy, and local/nonlocal size effects.

/pdf/void-growth-in-high-strength-aluminium-alloy-single-crystals-1xalpk9y74.pdf

Void growth in high strength aluminium alloy single crystals: a CPFEM based study

The authors are thankful to the University of Aberdeen and Apache North Sea for their support for this project.

M. Amir Siddiq

Papers

Modelling of stress-corrosion cracking by using peridynamics

A CPFEM based study to understand the void growth in high strength dual-phase titanium alloy (Ti-10V-2Fe-3Al)

Void growth in high strength aluminium alloy single crystals: a CPFEM based study

Modelling Hydrogen Induced Stress Corrosion Cracking in Austenitic Stainless Steel

A new route for developing ultrafine-grained Al alloy strips using repetitive bending under tension