The missing link between connecting microstructure to mechanical properties: Going beyond Orowan

Mechanical Properties Microstructure Existing dislocations Inclusions, particles and point-defects Mechanical Properties Tensile strength Fracture Creep Fatigue Grains & GBs Voids/bubbles Deformation GB sliding Dislocations

Mechanical Properties Microstructure Existing dislocations Inclusions, particles and point-defects Inclusions, particles and point-defects Mechanical Properties Tensile strength Fracture Creep Fatigue Grains & GBs Voids/bubbles Deformation GB sliding Dislocations

Limitations Temperature? Anisotropy? Climb? Cross-slip? Material heterogeneity Particle coherency/cutting

Modelling Dislocations Atomistic more precise, but slow Discrete dislocation dynamics faster, but only approximates the physics

Any thing else? Difficulty in measuring grain sizes etc. Limits of small scale characterization Temperature – mechanistic differences Parameterized models – do they hide the details? Creep testing and mechanisms different at different stress levels (even at the same T). Difference with accelerated tests. Long term effects: accu. Damage, phase change, transmutation Not just modelling or experiments – but both! Small scale testing and its difficulties. Weld porosity Deconvoluting deformation mechanisms, how to combine the factors

Modelling Methods Discrete dislocation dynamics Phase-field (phase sep.) Continuum mechanical models, FEM elements