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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Coupling Advanced Characterization and Modeling Tools for Understanding Fundamental Phase Transformation Mechanisms: An MPMD Symposium in Honor of Hamish Fraser
Presentation Title Probabilistic Methodology for Analyzing and Reconstructing Parent Microstructures from EBSD Maps of Transformation Products
Author(s) Stephen Niezgoda, Eric Payton, Alex Brust, Vikas Sinha
On-Site Speaker (Planned) Stephen Niezgoda
Abstract Scope The properties and performance of transformation microstructures are often dependent on features of the prior microstructure, such as texture or grain size, which have been obscured by the transformation. Reconstruction of the parent is typically mathematically ill-posed, as the forward transformation is often one-to-many; exhibiting multiple orientation variants or transformation pathways. Point-to-point reconstruction techniques, which rely on a pre-supposed orientation relationship, may not be robust to noise or deviations from ideal conditions. Here we present a probabilistic approach to quantify the uncertainty in the orientation relationship and noise due to measurement resolution, variation in parent orientation, and sample preparation. The reconstruction is formulated as a global optimization where the target is to minimize the probability of misindexed points or equivalently to find the parent microstructure which was most likely to generate the observed transformed dataset. The approach is material agnostic and will be demonstrated on steels and titanium alloys.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced Characterization and Modeling Tools in the Context of Corrosion
Advances in TiAl- based Alloys
Applications of Ordering Tie Lines to Represent ALCHEMI Data in Intermetallic Compounds and Complex Oxides
Computational Investigation of Omega Phase Evolution in Ti-Mo and Ti-V Systems
Coupled Characterization and Modeling of the Crystallography of Phase Transformations
Deformation by Dislocations, Twinning, and Phase Transformations in Compositionally Concentrated FCC Solid Solutions
Effects of Ternary Element Additions on the Precipitation of α and ω Phases in Ti-Mo Alloys
Evolution of Microstructure and Transformation Texture in Titanium Alloys
Fun-research and Some Exciting Results (FRASER)
How I Learned to Stop Worrying and Love the Metallurgical Play Pen
Lattice Site Correspondence in Active Eutectoid Decomposition in Ti-Cu and Zr-Cu Alloys
New Techniques for Interrogation of Structure in Additively Manufactured Materials
Phase and Intrinsic Stress Stability in Thin Multilayered Films
Phase Separation and Atomic Ordering in Mixed III – V Epitaxial Layers
Phase Stability of Nanostructured Steel Studied by Atom Probe Tomography and the Defactant Concept
Phase Transformations, Microstructure Evolution and Mechanical Properties of Nickel-base Superalloys Studied by Analytical Scanning and Transmission Electron Microscopy
Probabilistic Methodology for Analyzing and Reconstructing Parent Microstructures from EBSD Maps of Transformation Products
Progress in the Application of ICME in the Titanium Industry
Progress with 3-dimensional Materials Science Tools for Aerospace Alloy Engineering
Qualification of Topology Optimized Titanium Parts Made by Additive Manufacturing through In-situ Process Monitoring
Quantitative Characterization of Microstructure in Near-alpha and Alpha+Beta Titanium Alloys
Steel Ab Initio: Atomic Scale Characterization and Modeling in the Development of High Strength Steels
The Need for Advanced Techniques to Couple Multiscale Physics Based Structural Models
The β to α Transformation in Titanium Alloys
Thermoelastic Equilibrium and Superfunctionality of Pre-transitional Materials: Superelasticity, Supermagnetostriction, Invar and Elinvar Effects

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