Thermal stability and coarsening of eutectic and near-eutectic Ni–Ce alloys

Haider, Syeda Bushra; Robin, Ishtiaque Karim; Lass, Eric A.

doi:10.1016/j.intermet.2024.108458

Thermal stability and coarsening of eutectic and near-eutectic Ni–Ce alloys

Journal Article · Tue Aug 20 00:00:00 EDT 2024 · Intermetallics

DOI:https://doi.org/10.1016/j.intermet.2024.108458· OSTI ID:2552925

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University of Tennessee, Knoxville, TN (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Ni–Ce alloys are currently being studied as a castable alternative to conventional Ni-based superalloys. To understand the evolution of microstructure and mechanical behavior at elevated temperatures, this study investigates the mechanism of coarsening behavior in eutectic and near eutectic Ni–Ce at 900 °C. The as-cast eutectic Ni–Ce consists of a combination of fine lamellar and rod eutectic colonies with coarser boundary regions. Upon annealing, continuous coarsening, via process of globularization, initiates at colony boundaries or primary dendrites where faults (termination and branches) in the lamellar structure are plentiful. Coarsening then proceeds by a combination of fault migration mechanism and lamellar boundary splitting, growing toward the center of the eutectic colonies with increasing annealing time. Coarsening near the center of a colony is extremely slow, indicating the eutectic microstructure itself is very stable. Here, the near-eutectic alloys containing primary dendrites coarsen and stabilize faster compared to the fully eutectic alloy. Moreover, an anomaly is observed in the hardness of the fully eutectic alloy after long exposure at elevated temperature compared to the near-eutectic alloys.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2552925

Report Number(s):: PNNL-SA--203940

Journal Information:: Intermetallics, Journal Name: Intermetallics Vol. 174; ISSN 0966-9795

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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