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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium High Temperature Creep Properties of Advanced Structural Materials
Presentation Title Induction of Alternative Shearing Pathways during Creep Deformation of Nickel Based Superalloys via Local Phase Transformation Strengthening
Author(s) Ashton J. Egan, Fei Xue, Emmanuelle Marquis, Michael J Mills
On-Site Speaker (Planned) Ashton J. Egan
Abstract Scope Deformation of nickel-based superalloys during intermediate temperature creep is dominated by planar defects and microtwinning, where shearing processes are controlled by diffusion mediated segregation and reordering. Local Phase Transformation (LPT) strengthens alloys via formation of η/χ at the defects. Novel LPT strengthening has recently been shown along microtwin boundaries through correlative controlled Electron Channeling Contrast Imaging (cECCI) and Scanning Transmission Electron Microscopy (STEM) studies. This LPT obstructs additional shearing partial dislocations from thickening microtwins, thus preventing rapid strain accumulation. In response, strain alternatively accumulates via deformation induced formation of ordered-HCP “nano-laths”; these are associated and grow from LPT at microtwin interfaces and appear formed by otherwise twin-inducing partials. Advanced characterization of deformation processes was conducted utilizing cECCI, probe corrected STEM, and atomic resolution Energy Dispersive X-Ray Spectroscopy (EDS) to confirm lattice site occupancies.
Proceedings Inclusion? Planned:
Keywords Characterization, High-Temperature Materials, Phase Transformations

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Microstructure Sensitive Model to Account for the Non-isothermal Creep Behavior of Ni-based Single Crystal Superalloys
CALPHAD Alloy Design for Diffusion-mediated Plasticity-Induced Phase Transformations for Creep Resistant Multicomponent Principal Elemental Alloy
Creep and Creep-ratcheting Behaviour of Selective Laser Melted (SLM) Additively Manufactured (AM) Inconel 718
Creep and Tensile Properties of Five Novel, Computationally Designed Ni-based SX Superalloys
Creep Behavior at Elevated Temperatures of Several Polycristalline Ni-based Superalloys Strengthened by MC-carbides
Creep Behaviors of High-entropy Alloys
Creep Ratcheting of a HP+NbW (MA) Steam Methane Reformer Tube Alloy
Creep Simulations of Refractory High Entropy Alloys
Crystal Plasticity Creep Modeling in Cobalt Based Superalloys
Effect of Alloying Additions on Twinning in Ni-based Superalloys
Effect of the Casting Process on the Microstructure and Creep Properties of a Cast Ni-Based Alloy
F-1: A Study on Microstructure and Mechanical Properties of Fe-Cr-Ni-Al-V Alloys
F-2: Effects of Controlling Ti and Al on Microstructure and Mechanical Properties of Fe-Cr-Co-Al-Ti Ferritic Alloys
F-3: Strengthening Against Creep at Elevated Temperature of HEA Alloys of the CoNiFeMnCr Type Using MC-carbides
Induction of Alternative Shearing Pathways during Creep Deformation of Nickel Based Superalloys via Local Phase Transformation Strengthening
Mechanisms of Creep in Additively Manufactured NiCoCr and ODS-NiCoCr Multi-principal Element Alloys
Role of Cr Content on Creep-rupture Performance in Alumina-forming Austenitic Alloys
The Elevated Temperature Creep, Fatigue, and Fracture Behavior of Nickel-based Superalloys Manufactured by Direct Metal Laser Sintering
Thermal Creep Models Derived from a Comprehensive Multiple Heat 9Cr Tempered Martensitic Steels Database
Threshold Creep Behaviour of Ni-based Superalloy IN740H

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