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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium 30 Years of Nanoindentation with the Oliver-Pharr Method and Beyond
Presentation Title Factors Affecting Nanoindentation Derived Activation Parameters for PLC Effects
Author(s) Henry Ovri, Erica Lilleodden
On-Site Speaker (Planned) Henry Ovri
Abstract Scope The relevant atomic species that dynamically age dislocations during deformation and consequently the underlying deformation mechanisms that govern Portevin-Le Chaterlier (PLC) effect are commonly accessed by estimating the associated activation enthalpy, ∆Ea. We recently developed a nanoindentation-based approach that is based on a more theoretically sound phenomelogical model than the conventional uniaxial test based methods. Unlike the latter, the model provides estimates of ∆Ea along with the associated activation volume and attempt frequency at only one temperature. In this talk, we will highlight the influence of strain rate, indentation depth, and indenter geometry on these parameters and discuss the implications of these variables on the utility of the technique for investigations of PLC.
Proceedings Inclusion? Planned:
Keywords Aluminum, Characterization, Mechanical Properties

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Adapting Nanoindentation for In-situ Electron Microscopy Experiments in Coupled Environments
An Improved Technique for Accurate Mechanical Characterization of Free-standing Films and Its Applications
Analyzing Thin Film Strength and Thermo-mechanical Behavior by Wedge Indentation and Bi-metal Beams
Application of Nanoindentation Strain Rate Jump Tests to Measure Strain Rate Sensitivity of Single Crystal Tungsten and Microcrystalline Cellulose
Assessing Segregation-induced Softening in Nanocrystalline Stabilized NiP by Nanoindentation
Bulk Metallic Glass Ductility Trends Are Revealed by High Data Rate Experiments
Characterization of Grain Boundaries in Geological Materials Using Micromechanical Testing
Comparison between Long-term Nanoindentation Creep Testing under Constant Load and Constant Pressure
Correlation between Electrical Contact Resistance, Deviation from Elastic Unloading and Phase Transformation in Silicon
Determination of Constitutive Properties for Shape Memory Alloys from Nanoindentation Response
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Development of a New Method to Measure Surface Mechanical Properties Using In Situ SEM Microshear: Application at High Strain Rate
Estimating the Elastic Constants of Pulp Fibers with Nanoindentation
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H-1: High-speed Indentation for 3D Mapping of Nanoporous Gold
H-2: Investigating the Strain Rate Dependence of Hardness of Cu/Mo Nanolaminate Films Using Conventional and High Strain Rate Nanoindentation Methods
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Nanoindentation Creep Testing: Advantages and Limitations of the Constant Contact Pressure Method
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Size-dependent Indentation Behavior and Geometrically Necessary Dislocation Structures of Single-crystalline Tungsten
Understanding Rate-depending Plastic Deformation under Hydrogen Influence through Advanced In-situ Electrochemical Nanoindentation
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