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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Deformation and Damage Mechanisms of High Temperature Alloys
Presentation Title Local Phase Transformation Strengthening in Ni-based Superalloys and Induction of Alternative Displacive-diffusional Shearing Pathways
Author(s) Ashton J. Egan, Fei Xue, Gregory Sparks, Timothy Smith, Emmanuelle Marquis, Sammy Tin, Michael Mills
On-Site Speaker (Planned) Ashton J. Egan
Abstract Scope Planar defects and microtwins dominate the intermediate temperature creep regime of Ni-based superalloys, where processes are controlled by diffusion mediated reordering and segregation. Local Phase Transformation (LPT) along defects strengthens alloys possessing critical ratios of η/χ formers. A new LPT strengthening along microtwin boundaries has recently been shown through Electron Channeling Contrast Imaging (ECCI) and Scanning Transmission Electron Microscopy (STEM) studies. This LPT has led to formation of ordered-HCP “nano-laths” via coupled displacive-diffusional mechanism by which strain alternatively accumulates. Advanced characterization of this process was conducted using STEM and atomic resolution Energy Dispersive X-Ray Spectroscopy (EDS), confirming lattice occupancies. Correlative Atom Probe Tomography (APT), as well as STEM modeling, were used for phase confirmation. Orientation effects of operative shearing mechanisms, LPTs, and lath formation were studied in polycrystal specimens and compared to single crystal results. Understanding these processes will inform multiscale modeling efforts and assist in alloy design.
Proceedings Inclusion? Planned:
Keywords Characterization, High-Temperature Materials, Phase Transformations

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Comparative Analysis of the Low-cycle Fatigue Behaviors of HAYNES 244 Alloy and Waspaloy
A Framework to Enable Location-specific Analysis of Components by Incorporating Microstructural Information during the Product Design Cycle
A Physics-based Vacancy Diffusion Model to Capture High Temperature Creep Responses: Application to 316H Stainless Steel
An In-situ SEM Elevated-temperature Investigation of Serrated Plastic Flow in a CoCrFeNiW-C Alloy
Composition and Heat Treatment Modifications of a New Low-cost Ni Base Wrought Alloy for Improved Creep Resistance and Elevated Temperature Ductility
Contributions of Oxidation and Creep to High Temperature Fatigue Crack Susceptibility in Waspaloy
Coupled Diffusional-mechanical Modeling of Hydrogen Embrittlement in Polycrystalline Materials
Creep Behavior and Durability of Laser Metal Deposited Waspaloy
Defect Control and Mechanical Properties of Laser Powder Bed Fusion Built Haynes 230 for High Temperature Application
Deformation Twinning during Elevated Temperature Testing in HAYNES® 244® Alloy
Design of Cast Alumina-forming Austenitic Alloys for Extreme Environments
Effects of Alloying Elements on Mechanical Properties and Environmental Resistance of Silicide Strengthened Nb-based Alloys
Enhanced 900 °C-yield Strength in Inconel 738 Superalloys While Reducing Expensive Co Compositions
Ferritic Bcc-Superalloys – Slip System Control Through Alloying
Forging and Heat Treatment Conditions that Produce Visible Grains in a Nickel Alloy
Frictional Ignition of Superalloys in High-pressure, High-temperature Oxygen
G-1: Developing Methods for Microstructural Control of Ni-Cr Binary Alloys
G-2: The Efficacy of Using Flat Plate Oxidation Data as a Proxy for Active Crack Tip Behavior in Waspaloy
Grain Scale Deformation Study of a Nickel-based Superalloy under Thermo-mechanical Fatigue Utilizing Crystal Plasticity Simulations and High-energy X-ray Diffraction Microscopy
Improving the Creep Properties of High-strength Superalloys Produced by Laser Powder Bed Fusion
In Situ Characterisation of the Thermomechanical Deformation Behaviour of Powder Processed Ni-based Superalloys
Influence of Gamma’ Precipitates on Recrystallization and Grain Growth Phenomena in Ni Based Superalloys : Smith-Zener Pinning and So Much More
Intra- and Intergranular Deformation Measurement in Polycrystalline Materials at High Temperature Using High-resolution Digital Image Correlation
Investigating Deformation Mechanisms in Ni-based Superalloys with Compact γ'- γ" Coprecipitates
Investigating the Role of Dynamic Strain Aging in 347H Steel Using Crystal Plasticity
Local Phase Transformation Strengthening in Ni-based Superalloys and Induction of Alternative Displacive-diffusional Shearing Pathways
Machining-induced Microstructural Deformation and Grain Refinement of Ni-base Superalloys under Controlled Thermal Conditions
Materials Selection and Structural Design Considerdations for Regeneratively Cooled Rotating Detonation Rocket Engines
Mechanistic Modeling of Thermal Creep Response of 347H Stainless Steel: Effect of Microstructure and Chemistry
Microstructural and Mechanical Aspects of Damage Mechanisms In Dwell-fatigue In Inconel 718
Microstructural Evolution of Borides at 850°C in a Polycrystalline Superalloy and Implications on Creep Performance
Microstructurally-sensitive Fatigue Crack Nucleation and Growth in Nickel Single Crystals
Microstructure and Mechanical Properties of Rotary Friction Welded IN-600 and SS316L with Copper Interlayer
NOW ON-DEMAND ONLY – Investigating the High-temperature High-cycle Fatigue Properties of a Novel Fe-Ni-Cr-Al-Ti-based Superalloy
Numerical Studies to Analyze the Deformation Behavior of Corroded Material under High Velocity Impact Using Continuum Damage Mechanics
Numerical Studies to Predict the Fracture Behavior due to Stress Corrosion Cracking under Different Environmental Conditions
On the Influence of γ’-particle Size on the Yield Stress Anomaly in Ni-base Single Crystal Superalloys
Phase Field Modeling of Void Growth under Creep
Precipitate Free Zone Formation in an Alumina-forming Austenitic Stainless Steel and the Effect on Mechanical Properties
Precipitate Free Zones (PFZ) Formation at Grain Boundaries in γ/γ Ni-based Superalloys
Preferential Precipitation of γ' on Annealing Twin Boundaries in Superalloys
Rejuvenation Treatment for Ni-based Single Crystal Superalloys with Process Induced Pre-deformation
Slip Localization and the Prediction of Fatigue Strength of Polycrystalline Alloys
Stacking Faults in Forged Polycrystalline Ni-based Superalloys in the Fully Heat-treated Condition Prior to Further Deformation
Strengthening via Chemical Segregation to Deformation Twin Boundaries in Co-Ni-Cr-Mo Superalloy
Systematic Study of the Effect of Alloying on APB and SISF Energies in L12-(Co,Ni)3(Al,W,Ta)
Temperature Dependence of Tensile and Fatigue Properties of Additively Manufactured Ni-base Superalloys: A Comparative Study
Tensile Ductility and Plastic Deformation Behavior of Polycrystalline Refractory Multi-principal Element Alloys
The Effect of Carbon on the Fabricability and Mechanical Performance of Nimonic 105
The Effect of Environment on the Near-crack Deformation Induced during Dwell Fatigue of a Ni-base Superalloy
Ultra-high Temperature Deformation in a Single Crystal Superalloy: Mesoscale Process Simulation and Micro-mechanisms
Very High Cycle Fatigue Properties of CoNi- and Ni-based Single-crystal Superalloys
Welding and Weldability of Ni- and Ni-Fe-based Superalloys

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