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Meeting 2019 TMS Annual Meeting & Exhibition
Symposium Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
Sponsorship TMS: High Temperature Alloys Committee
TMS: Integrated Computational Materials Engineering Committee
Organizer(s) Michael S. Titus, Purdue University
David Dye, Imperial College
Eric A. Lass, University of Tennessee-Knoxville
Katelun Wertz, Air Force Research Laboratory
Christopher H. Zenk, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Scope The report of a stable \\947;’-L12 phase in the ternary Co-Al-W system in 2006 has given rise to significant research on a new class of precipitation strengthened alloys, analogous to Ni-based superalloys which are often utilized in high temperature turbine engine components. Since the initial discovery, a myriad of Co- and CoNi-based alloy compositions have been developed with proposed applications ranging from high pressure turbine blades to compressor disks. However, significant challenges still exist for commercial transition of these new alloys, including increasing the \\947;’-solvus, improving oxidation resistance, characterizing fatigue resistance, and establishing processing windows.

This symposium continues in the tradition of the first two TMS symposia on \\947;-\\947;’ Co-based superalloys (held in 2014 and 2017) to bring together the growing community of researchers involved with developing \\947;’-strengthened Co-based superalloys for high temperature and other applications. Experimental and computational investigations on Co- and CoNi-based alloys that focus on understanding materials response, use ICME-based approaches, or aid in rapid alloy development will be highlighted. Topics of interest include: strategies for increasing the \\947;’ solvus temperature, improving environmental resistance, evaluating high temperature mechanical performance, assessing phase stability and phase transformation mechanisms, and advancing processing methods of these promising new materials.

Abstracts Due 07/16/2018
Proceedings Plan Planned: Supplemental Proceedings volume

A Rapid and Simplified Approach to Accurately Measure Single Crystal Elastic Constants
An ICME-base Investigation of the Homogenization of a Novel VIM/VAR Co-Ni Superalloy
Balancing the Property Suite in Co-base Superalloys
Creep Deformation Mechanisms and Compositional Changes in SX Co-base Superalloys Studied by Means of EM and APT
Crystal Plasticity Finite Element Approach to Modeling the Creep Behavior in Cobalt-based Superalloys
Development of Ni/Co Based Superalloys: CALPHAD and Materials Databases
Effect of Pre-deformation on the Aging Response of Co/Ni-base Superalloys
Effect of Tertiary Gamma Prime on the Creep Performance of a Developmental Co:Ni-Base Superalloy
Elemental Partitioning and Site-occupancy Behavior of Alloying Elements in γ/γ′-Strengthened Co-Ti based Alloys
Elucidating the Effects of Cr on the Microstructure, Oxidation Resistance and Mechanical Properties of Cobalt-based Superalloys
Exploration of Thermo-Mechanical Processing Parameters for a Polycrystalline γ-γ' Cobalt-base Alloy
Low Cycle Fatigue of Single Crystal γ'-Strengthened Co-based Superalloys at 750 °C in Air
M-13: Diffusion in FCC Co-rich Co-Cr-Ni-Ta Alloys
M-14: Effects of Cr and Al Additions on the Microstructure and Mechanical Properties of Co-Ti-W Based Alloys
M-15: The Effect of Titanium on the Tungsten-free Cobalt-base superalloys
Microstructural and Compositional Design of Multicomponent Co/Ni-based Superalloys using High-throughput Diffusion Multiples
Partitioning Preferences of Alloying Elements and their Effect on the Stability of the γʹ/L12-phase in Co-base Superalloys
Solute Segregation Effects at Planar Defects during Creep of CoNi-based Superalloys
Structural Evolution of a Single Crystal Co-base Superalloy during Creep at 1000ºC/137 MPa
The Effect of Long Term Exposure at Elevated Temperature on the Stability of a Novel Co-Ni Based Superalloy
The Formation of Protective Alumina on γ’-Strengthened Co-Ni-Al-Mo-Ta Alloys during Exposure at Elevated Temperatures
The Hunt for B and C in Grain Boundaries and their Role in Crack Tip Embrittlement
Thermophysical and Mechanical Properties of Multi-nary Single Crystalline Co-base Superalloys
Towards Developing a New Generation of Cobalt Based Superalloys
Wrought Co-base Superalloys – Mechanical Properties and Deformation Mechanisms
γ+γ′ Microstructures in W-free Co-Ta-V- and Co-Nb-V-based Systems

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