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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
Presentation Title Modeling Dislocation Arrays in Orientation Gradient Microstructures in Ta Thin Films
Author(s) Elizabeth Ellis, Ari Kestenbaum, Shefford P. Baker
On-Site Speaker (Planned) Elizabeth Ellis
Abstract Scope Tantalum films are widely used in industry, in such applications as thin film capacitors and resistors. When Ta is deposited in the metastable beta phase and then annealed to transform to the stable alpha phase, an unusual microstructure arises: EBSD results show that the orientation of these films rotates continuously through large angles across the film. In order to understand this structure, we have tried to predict the types of dislocations which may give rise to this microstructure. While a Nye tensor approach was not successful for calculating geometrically necessary dislocations directly from EBSD data, a simple model showed that our microstructure can be replicated using a simple rotation scheme. Expanding on this, we developed a genetic algorithm to analyze the dislocations associated with our orientation gradient microstructure and found several recurring features. Based on these findings, we comment on the origin and development of this unique microstructure.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


3D Dislocation Structure Evolution Underneath Indentations in Single Crystalline
3D Orientation Mapping in the Transmission Electron Microscope
A Correlation between Digital Image Correlation and Grain Misorientation Distribution Mapping to Capture the Localized Plastic Deformation in a Polycrystalline Titanium Alloy
A Multi-scale FE-FFT Approach to Study Lattice Strain Evolution during Biaxial Strain Path Changes
A Novel In Situ TEM Technique: High Strain Rate Tensile Testing in the Dynamic TEM
Analysis of Dislocation Structures in Ferritic and Dual Phase Steels Regarding Continuous and Discontinuous Loading Paths
Analysis of Strain Localization During Creep of a Polycrystalline Superalloy Using SEM-DIC
Atomic-scale Characterization of Boron Carbide with Advanced TEM and Atom Probe Techniques
Atomic Resolution Energy Dispersive X-ray Spectroscopy of Segregation Along SESFs in Ni-Based Disk Alloys
Atomic Scale Investigation of Co-deformation and Mechanical Mixing in Severely Deformed Multiphase Structures
Characterization and Deformation Behavior of Microstructural Gradients in the Low Solvus High Refractory (LSHR) Nickel Base Superalloy
Characterization of Dislocation Pile-ups at Special Angle Tilt Boundaries in Pure Nickel by Electron Channeling Contrast Imaging (ECCI) and Molecular Dynamics Simulations
Characterization of the Mechanistic Responses of Three Silicon Carbide Variants to Knoop Indentation by TEM
Characterizing the Boundary Lateral to the Shear Direction of Deformation Twins in Magnesium
Comparison of Dislocation Characterization in Tantalum using Electron Channeling Contrast Imaging and Cross-Correlation Electron Backscattered Diffraction
Comparison of Measured and Simulated Elastic Strain States in Crystal Plasticity Simulation of Experimentally Deformed and Characterized Microstructure Patches
Deformation and Strengthening Mechanisms in AISI 321 Austenitic Stainless Steel under both Dynamic and Quasi-static Loading Conditions
Detection of the Onset of Plasticity in Micro-crystals: In-situ Deformation of InSb Micro-pillars under Synchrotron Coherent X-ray Nanobeam
Determination for Dynamic Fracture Toughness of Linear Elastic Materials Using the Large Dimensional Hopkinson Tube
Determination of Geometrically Necessary Dislocations in Large Shear Strain Localization in Metals
Digital Image Correlation Using Forescatter Detector Images for the Study of Transformation in TRIP Steel
Dislocation Characterization in a Scanning Electron Microscope Equipped with an Annular STEM Detector
Dislocation Interaction and Fatigue Damage Evolution at Grain Boundaries Studied by In-situ Cyclic Loading of Bi-crystalline Micro Samples
Dissecting Dislocation Dynamics Simulations : The Search for the Origins of Dislocation Microstructure Evolution
Effect of 3D Crystallographic Orientation on Evolution of Corrosion in Aluminum Alloys
Effect of Indentation Load on Deformation Mechanisms in Boron Carbide
Effect of Strain and Stress Holds on Deformation in Ti-6Al-4V: Microscale Evidence of Load Shedding
Effect of Thermal and Mechanical Loadings on the Residual Strain Field in a Shot-peened Nickel Based Superalloy Investigated Using the Synchrotron X-ray Microdiffraction Technique
Effects of Crystal Orientation on Shock Induced Dislocation Dynamics of Single Crystalline Copper
Effects of Crystallographic Structure on Damage Evolution Using Diffraction-amalgamated Grain-boundary Tracking Technique
Explicit Modeling of Twin Lamellae in AZ31 Using a Crystal Plasticity Finite Element Approach
From Micro-Cantilever Testing to Deformation Patterning in Hexagonal Polycrystals
High Resolution Strain Mapping of Proton Irradiated Zirconium Alloy
High Resolution Strain Measurements in a Polycrystalline Superalloy during Deformation at Intermediate Temperature
High Temperature Dynamic Mechanical Behavior Characterization of Ti-6Al-4V Using a NEW Compression Kolsky Bar Technique
How Important are the Smallest Grains for their Aggregate Mechanics?
Improved Angular and Spatial Resolution of Measured Lattice Rotations in Highly Deformed Bulk Materials through Combining Low-kV EBSD with the Dictionary Indexing Approach
In-situ EBSD Analysis and Crystal Plasticity FE Simulations in a CP Titanium Sheet
In-situ Experiments to Capture Rapid Microstructural Evolution and Phase Transformation of Titanium during Dynamic Loading
In-situ Neutron Diffraction Studies of Load Path Changes in 316L and AZ31
In-situ Structural and Mechanical Characterization of ThCr2Si2-structured Superelastic Intermetallic Compounds
In Situ Strain Mapping of Deformation Processes in Metallic Specimens
In Situ TEM Compression Testing of IN718 Fabricated by Electron Beam Melting
Influence of Elastic Anisotropy and Local Texture on the Onset of Plastic Slip in Ti-6Al-4V
Investigating the On-set of Amorphization in Single Crystal Boron Carbide
Kink Band Propagation during Plastic Deformation of Bulk Metallic Nanolaminates
L-1: Analysis of Compact Forced Simple-Shear and Compact Forced Double-Shear Specimens for Shear Localization in Materials
L-2: Characterization of a Biocompatible Co-Cr-W Alloy by means of Correlative Microscopy and Nanoindentation Experiments
L-3: Displacement Rate and Temperature Equivalence in Stochastic Cluster Dynamics Simulations of Irradiated Pure alpha-Fe
L-4: Error Analysis of the Dictionary Approach to Electron Backscatter Diffraction Indexing
L-5: Microstructural Development During Particle/Substrate Impacts in Cold Spray of Gas Atomized Aluminum Alloy Powders
L-6: NiAl Oxidation Reaction Processes Studied In Situ Using MEMS-Based Closed-Cell Gas Reaction Transmission Electron Microscopy
L-9: Unidirectional Fibre Composite Characterisation from X-ray Tomography
Mapping the Deformation of Brazed Joints in Ti-6Al-4V Specimens Using High Angular Resolution Electron Backscatter Diffraction (HR-EBSD) and High Spatial Resolution Digital Image Correlation (HR-DIC)
Measuring Residual Stresses in Boron Carbide in TEM
Mechanics of Phase Transformation in Shape Memory Alloys: A Coupled High-energy X-ray Diffraction and Forward Modeling Approach
Microstructural Characterization of Inconel 600 Tubes after Tensile Tests at Various Temperatures and Strain Rates
Microstructure Characterisation of Drilled Chips of 316L Stainless Steel
Modeling Dislocation Arrays in Orientation Gradient Microstructures in Ta Thin Films
Modeling of Matrix-precipitate Interactions in NiTi Using FFT-based Constitutive Modeling
Modeling the Evolution of Slip System Strength in α–Phase Ti-7Al Using High-Energy Diffraction Microscopy Data
On the Optimization of a Biaxial Tensile Test Specimen Design
Parameter Estimation in Crystal Plasticity Based Material Models
Physics Based-crystal Plasticity Modeling of Single Crystal Niobium
Progress on Measuring the Transient Dynamic Strength of Rapidly Heated Plain Carbon Steels
Quantifying Strain-path Dependent Dislocation Densities Using Time of Flight Neutron Diffraction and High Resolution Electron Backscatter Diffraction Techniques
Recent Applications of Micromechanical Modeling Directly Coupled with Advanced Characterization Techniques of Polycrystalline Materials
Representation of Materials Microstructure for Modeling
Role of Adjoining Twin Pairs on Detwinning under Stress Reversal in HCP Metals
Shear-Coupled Grain Growth and Texture Development in a Nanocrystalline Ni-Fe Alloy during Cold Rolling
Strain Localization Structures in Textured Magnesium AZ31 under Reversed Loading via Multi-scale Digital Image Correlation
Study of Homophase Interfaces in Structural Materials by ECCI and EBSD in the SEM
The Origin of Stochastic Behavior during Nanoindentation near a Grain Boundary in Cu
Toward a Description of Disinclination Densities Using Orientation Imaging Data
Tracking Shear-migration Coupling of Grain Boundaries Using In Situ TEM
Twinning Kinetics and Its Sensitivity to the Strain Rate
Unambiguous Complexion Identification and Inspection in High Purity Binary Alloy Systems
Understanding the Role of Competing Slip Systems during Formation of Stress Hotspots in Hexagonal Close Packed (HCP) Materials

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