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Meeting MS&T23: Materials Science & Technology
Symposium Advanced Materials for Harsh Environments
Presentation Title Coarsening and Globularization in Eutectic Ni-Ce Alloys
Author(s) Syeda Bushra Haider, Eric A. Lass
On-Site Speaker (Planned) Syeda Bushra Haider
Abstract Scope Ni-Ce alloys are currently being studied as a castable alternative to conventional Ni-based superalloys. To understand the evolution of microstructure at elevated temperatures, in this study the mechanism of coarsening and globularization behavior of eutectic Ni-Ce is studied. The as cast eutectic Ni-Ce consists of a combination of fine lamellar and rod eutectic colonies with coarser boundary regions. The evolution of the microstructure at 800 C and 900 C exhibits discontinuous and continuous coarsening respectively. Moreover, globularization which can be described as a form of continuous coarsening, is prominent at the eutectic colony boundary which with time moves towards the center of the colony. The coarsening rate near the center of a colony is extremely slow, indicating the eutectic itself is very stable. Globularization starting from cell boundaries is found to be the prominent mechanism at 900 C.

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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