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

Explore the missing link between microstructure and mechanical properties, including existing dislocations, inclusions, particles, and point defects. Examine tensile strength, fracture, creep, fatigue, voids/bubbles, grains and grain boundaries, deformation, and dislocation-related phenomena. Discuss the limitations, such as temperature, anisotropy, climb, cross-slip, material heterogeneity, and particle coherency/cutting. Highlight various modelling methods, including atomistic, discrete dislocation dynamics, and continuum mechanical models. Emphasize the importance of combining experimental data with modeling approaches in understanding microstructure-property relationships.

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

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

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

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

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

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

  6. 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

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

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