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Meeting 2019 TMS Annual Meeting & Exhibition
Symposium Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
Presentation Title The Formation of Protective Alumina on γ’-Strengthened Co-Ni-Al-Mo-Ta Alloys during Exposure at Elevated Temperatures
Author(s) Saurabh Mohan Das, Mahander Pratap Singh, Om Puri Gosain, Kamanio Chattopadhyay
On-Site Speaker (Planned) Saurabh Mohan Das
Abstract Scope L12 precipitate-strengthened Co-base alloys with a basic composition of Co-Ni-Al-Mo-Ta attract attention due to their similar microstructure and comparable solvus temperature and low density to Ni-base superalloys. The present paper discusses the further development of this new series of alloys to have better environment resistance during exposure at high temperature. This includes the high temperature oxidation behavior at different temperatures (650-1000C) of this alloy and improvement of oxidation resistance by further additions of alloying elements like Ti and Cr with varying concentration without hampering solvus temperature and long term microstructural stability. In the base composition, there is a formation of amorphous alumina at oxide/matrix interface. It was observed that there is a minimum concentration of Cr that is required for the formation of crystalline and protective alumina. Further addition of Cr leads to rapid formation of continuous alumina and hence a drastic reduction in oxidation rate could be observed.
Proceedings Inclusion? 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 1000C/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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