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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium 2021 Technical Division Student Poster Contest
Presentation Title Mechanical Behavior of Thermally Stable, Hierarchical Ni-Y Alloys
Author(s) Shruti Sharma, Samuel Moehring, Saurabh Sharma, Kiran Solanki, Pedro D Peralta
On-Site Speaker (Planned) Shruti Sharma
Abstract Scope Microstructure refinement and alloy additions are potential routes to increase the high temperature performance of existing metallic alloys. Nanocrystalline (NC) metallic alloys with immiscible second phases, e.g., Cu-10Ta, exhibit improvements over microstructurally unstable NC metals and their coarse-grained counterparts. However, matrices with higher melting points must be considered. Ni-Y alloys synthesized via arc-melting were studied for this purpose. Samples were heat-treated to study microstructural stability and characterized using WDS for local composition, SAXS for particle size distribution and spacing, and EBSD for local crystallography. Alloys had a stable, hierarchical microstructure with ultrafine eutectic of ~300 nm, dendritic arm spacing of ~10 µm and grain size ~200 μm. Uniaxial compression performed at 25 and 600 °C and room temperature hardness tests revealed that yield strength and microhardness of alloys with small amounts of Y (0.5-1wt%) were comparable to Ni-superalloys, due to the hierarchical microstructure and potential presence of nanoscale intermetallic precipitates.
Proceedings Inclusion? Undecided
Keywords High-Temperature Materials, Mechanical Properties, Other

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