About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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Characterization: Structural Descriptors, Data-Intensive Techniques, and Uncertainty Quantification
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Presentation Title |
Investigating the Effect of Solute Segregation to Grain Boundaries in Nanocrystalline Alloys Toward Stability and Strengthening |
Author(s) |
Ankit Gupta, Gregory B. Thompson, Garritt J. Tucker |
On-Site Speaker (Planned) |
Ankit Gupta |
Abstract Scope |
Nanocrystalline (NC) materials offer an improvement in several mechanical properties such as increased strength/hardness. However, poor stability of grain boundaries at such smaller length scales can lead to grain growth at higher temperatures and during mechanical loading, thereby, severely affecting the mechanical properties of NC materials. Addition of alloying elements have shown to drastically improve their stability. In this study, Interfacial solute segregation behavior of P in nanocrystalline (NC) Ni alloys is investigated on an atomic scale using cross-correlative PED-APT measurements and atomistic simulations. An inhomogeneous P-segregation in grain boundaries (GBs) of NC Ni is observed. The interfacial solute excess is characterized as a function of initial GB energy, volume and misorientation. It is shown that the solute segregation behavior of GBs, especially in NC structures, cannot be properly captured with average measures such as GB misorientation, energy. Improved indices for quantifying GB solute segregation behavior are developed. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |