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Meeting 2019 TMS Annual Meeting & Exhibition
Symposium Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys III
Presentation Title Creep Deformation Mechanisms and Compositional Changes in SX Co-base Superalloys Studied by Means of EM and APT
Author(s) Malte Lenz, Yolita Eggeler, Julian Müller, Dorota Kubacka, Surendrar Makineni, Christopher Zenk, Nicklas Volz, Steffen Neumeier, Peter Felfer, Philip Wollgramm, Gunther Eggeler, Mathias Göken, Baptiste Gault, Dierk Raabe, Erdmann Spiecker
On-Site Speaker (Planned) Malte Lenz
Abstract Scope In this work a multinary SX Co-based superalloy (ERBOCo-1) was creep deformed at 850°C in tension and compression. At different creep stages corresponding to plastic strains of 0.3% and 5% characteristic defect processes are activated giving rise to a tension-compression asymmetry. The nature of planar faults and dislocations are characterized using conventional TEM and large-angle convergent beam electron diffraction (LACBED). Moreover, HR-STEM imaging combined with geometric phase analysis (GPA) was utilized to study the atomic structure of these defects. The chemical composition of twins, superlattice intrinsic/extrinsic stacking faults and superpartial dislocations was studied by combining STEM-EDXS and atom probe tomography (APT). A site-specific preparation method was applied to prepare APT-tips containing single planar defects. HR-STEM and EDXS investigations show that the local crystal structure in SISFs changes from L12 to D019 accompanied by localized compositional changes. We also investigated the influence of defects on the microstructural degradation.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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