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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.


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