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Meeting MS&T23: Materials Science & Technology
Symposium Advanced Materials for Harsh Environments
Presentation Title Castable Eutectic Ni-Ce Superalloys Strengthened by a γ/γʹ Microstructure
Author(s) S. Bushra Haider, Elizabeth Heon, Eric A. Lass
On-Site Speaker (Planned) Eric A. Lass
Abstract Scope Ni-based superalloys are the premier material for high-temperature applications but are often difficult to manufacture via solidification-based processing. Eutectic alloys typically possess good castability due to narrow solidification ranges. The Ni-Ce system possesses a eutectic reaction but has never been examined as a potential high-temperature material. This work investigates the microstructure and mechanical properties of near-eutectic alloys Ni-17Ce and Ni-17Ce-5Al (wt. %). Both alloys show outstanding high-temperature microstructure and mechanical property stability at 900 C. The formation of Ni3Al (γʹ) precipitates is observed in the primary FCC-Ni phase of the ternary Ni-Ce-Al alloy. The precipitation hardened ternary alloy exhibits superior hardness to Inconel 718 at elevated temperatures, retaining its strength to 750 C, or about 50 C higher than Inconel 718. The novel hierarchical microstructure consisting of thermally stable eutectic regions combined with γʹ-strengthened primary FCC-Ni and eutectic phases show great promise as a castable material solution for high-temperature applications.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Behavior of Select Refractories in Plastics Gasification Environments
Blue Phase Liquid Crystal Templated Nucleation and Growth of Inorganic Materials
Castable Eutectic Ni-Ce Superalloys Strengthened by a γ/γʹ Microstructure
Ceramic Far-Field Passive Wireless Sensors for High Temperature Measurement
Coarsening and Globularization in Eutectic Ni-Ce Alloys
Cold-rolled 3D Graphene Sheets as a Protective Material in the Fluorocarbon Plasma Environment
Corrosion Phenomena in Additively Manufactured Aluminum Alloys Containing Quasicrystalline Dispersoids
Crack Tip pH Measurements in Al-Cu-Mg and Al-Zn-Mg Alloys to Understand Differences In Corrosion Fatigue Behavior
Doped Lanthanum Chromite-refractory Based Composites Sensors for High Temperature Monitoring in Harsh Environments Systems
Effect of Heat Treatment on Grain Boundary Characteristics and Intergranular Creep Resistance of IN740H and It's Variant
Effect of Laser Surface Treatment on the Corrosion and Fatigue Performance of AA5456-H116 Alloys
J-3: Material Properties of High-strength High Chromium TWIP Steels with Increased Corrosion Resistance
J-4: Metal-coated Halloysite Nanotube-Based Antimicrobial Filtration System for Space Mission Applications
Microstructure and Mechanical Properties of Molded Martian and Lunar Regolith Compressed Pellet Samples
Performance of High Z and High-density Multifunctional Materials in Harsh Environments
Smart Phase Transforming Metal Ceramic Multilayers
Understanding SCC Resistance and Failure in AF96 Welded Joints
Virtual Characterization Tools for Understanding Material Response in Harsh Conditions

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