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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
Presentation Title The Central Role of the Chemical Potential of Hydrogen Regarding Hydrogen Ingress, Trapping, Defect Generation and Fracture
Author(s) Reiner Kirchheim
On-Site Speaker (Planned) Reiner Kirchheim
Abstract Scope Corrosion reactions determine the maximum chemical potential of hydrogen. Examples for iron, nickel and aluminum are presented. The self-diffusion coefficient of hydrogen in the metal is determined by the product of the H-diffusion in the perfect lattice times the fraction of hydrogen being diffusible. In this context, the quantities diffusible hydrogen, lattice hydrogen, thermodynamic activity of hydrogen and chemical potential of hydrogen are interchangeable in a general way. New discontinuities (fracture surfaces, voids, dislocations) are generated during hydrogen embritllement. The production rate of these discontinuities depends on the chemical potential of hydrogen within the defactant concept or the generalized Gibbs adsorption isotherm. Thus, the chemical potential of hydrogen determines both the amount of trapping and the defect generation rate. For a crack the chemical potential affects its velocity independent of the accompanying concentration enhancement in front of the crack tip or the H-coverage on the freshly generated crack surface.
Proceedings Inclusion? Planned:
Keywords Environmental Effects, Modeling and Simulation, Other


An Experimental-numerical Approach to Investigate Hydrogen Effects on Dislocations
Connecting Plasticity to Hydrogen Embrittlement Using High Energy Synchrotron X-rays
Crack-tip Shielding by Dislocations Analyzed by HVEM and Its Effect on Fracture Toughness and Hydrogen Embrittlement
Creep and Fracture Characterization in the TEM Using Full-field Measurement Methods and Finite Element Analyses
Deformation by Dislocations, Twinning, and Phase Transformations in Compositionally Complex FCC Solid Solutions
Elucidating Dislocation-interface Interactions via In Situ Straining in the Electron Microscope
Experiments in an Environmental Transmission Electron Microscope: Challenges And Solutions
Factors Influencing Fatigue Crack Growth Properties of Steels in Hydrogen Gas Environment
Grain Boundary Diffusion in Stainless Steel from Atomistic Simulations
Graph-based Analysis of Deforming Polycrystals
Ian Robertson’s Impact on Materials Science
In-situ 4D-STEM Imaging of Mechanical Deformation in Medium Entropy Alloy (MEA) and Bulk Metallic Glass (BMG)
In-situ Materials Micromechanics at Extreme Rates above 106 s-1
In Situ Investigation of the Role of Slip in Crack Initiation in Hydrogen Embrittled Alloy 725
In Situ TEM Studies on the Radiation Response of Cu with Nanovoids
In Situ TEM with Ion Irradiation at the IVEM-Tandem: Past, Present and Future
Incorporating Dislocations into the Simulation of EBSD Patterns
Insight into Deformation of Irradiated Materials through Combined Molecular Dynamics and In-situ TEM Studies
Interaction of Glide Dislocations with Interfaces in Mg Alloys
Investigation of Slip Transmission through a Complete Grain-level Assessment of the Stress-strain Evolution in Polycrystalline Alloys
Liquid Metal Embrittlement: Mechanisms at Small Scales
Modeling Grain Boundary Mediated Plasticity with Massively Parallel Atomistic Simulations
Multi-scale Characterization of the Effects of High Altitude Environments on Crack Tip Damage Evolution during Fatigue Loading of AA7075-T651
Multifaceted Research in Plasticity
NOW ON-DEMAND ONLY - Effect of Hydrogen on Creep Properties
NOW ON-DEMAND ONLY - Effects of Hydrogen on Deformation Evaluated with EBSD of Single Crystal Austenitic Stainless Steel
NOW ON-DEMAND ONLY - Hydrogen Embrittlement: From Experiments and Modeling to Prognosis
On the Evolution of Dislocation Structures in Irradiated Ferritic-Martensitic Steels
On the Path to Understanding Stress Corrosion Crack Initiation of Austenitic Alloys in High Temperature Water
Quantitative 3-D Imaging of Damage Evolution in High-temperature Composite Materials, at Temperature under Load, Using In Situ X-ray Computed Micro-tomography with Digital Volume Correlation
Revealing Hidden Defects via Stored Energy Measurements of Radiation Damage
Seeing in 3D and 4D - Advancing the Understanding of Recrystallization
Seeing is Believing: Contributions of Advanced Electron Microscopy Techniques to Understanding Materials Degradation in Energy Systems
Slip Transfer at Grain Boundaries Investigated with 2-D and 3-D Experimental Measurements
Sluggish Diffusion in Concentrated Solid-solution Alloys: Seeing is Believing
Some Challenges in Length and Time Scaling for Modeling Dislocations and Interface Reactions
Special Effects Testing and Advanced Characterization for the Development of a Multi-scale Model of Corrosion Fatigue Crack Growth that Incorporates Environmental Effects
The Central Role of the Chemical Potential of Hydrogen Regarding Hydrogen Ingress, Trapping, Defect Generation and Fracture
The Influence of Microstructural Anisotropy and Strain Rate on the Shear Response of 6061 And 7039 Aluminum Alloys
The Roles of Layering and Interfaces in Radiation Resistance of MAX and MAB Phase Materials
Uncovering the Limits of Grain Boundary Stability through In Situ and In Operando Characterization
Understanding Basic Properties and Degradation Mechanisms of Materials Using Ion Beams
Using Environmental Transmission Electron Microscopy to Understand the Fundamentals of Metal Oxidation
Validated Theory-guided Design of Refractory Multi-principal-element Alloys with Oxidation-resistant Coatings
Various Hydrogen/Deuterium Charging Methods for Site Specific APT Specimens
Visualization and Analysis in Additive Manufacturing
Zinc-Aluminum-Magnesium Coatings for Automotive Industry: Corrosion Analysis on Cross-sections via a New Scanning Electrochemical Microscopy Technique

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