NDLI: Improving the Effectiveness of the Solid-Solution-Strengthening Elements Mo, Re, Ru and W in Single-Crystalline Nickel-Based Superalloys

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Improving the Effectiveness of the Solid-Solution-Strengthening Elements Mo, Re, Ru and W in Single-Crystalline Nickel-Based Superalloys

Content Provider	MDPI
Author	Carolin, Körner Gaag, Tobias Ritter, Nils Peters, Alexandra Volz, Nicklas Gruber, Daniel Neumeier, Steffen Zenk, Christopher
Copyright Year	2021
Description	Tailoring the partitioning behavior of solid solution strengtheners is a crucial design strategy for advanced Ni-based superalloys. The goal of this study was to maximize the enrichment of Mo, Re, Ru and W in the γ-matrix phase. To determine the composition dependency of the partitioning behavior, a set of polycrystalline superalloys with varying contents of these solid solution-strengthening elements and a W-containing single-crystalline alloy series with varying concentrations of the γ′-forming elements Ta and Ti was produced. Assessed properties include phase compositions by electron-probe micro-analysis, phase transformation temperatures by differential scanning calorimetry and creep behavior. Re exhibits the most pronounced enrichment in the γ-matrix, followed by Mo, Ru and W. Due to the preference of the Al-sites in the γ′-phase in the order Ta > Ti > W > Mo > Re, the solid solution strengthening elements Mo, Re and W are displaced from the γ′-phase by increasing Ti and Ta contents. The investigated solutes do not directly influence the partitioning behavior of Ru as it prefers Ni-sites in the γ′-phase. Compressive creep experiments reveal a correlation between the content of solid solution strengtheners in the γ-phase and creep performance.
Starting Page	1707
e-ISSN	20754701
DOI	10.3390/met11111707
Journal	Metals
Issue Number	11
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2021-10-26
Access Restriction	Open
Subject Keyword	Metals Ni-based Superalloys Creep Solid Solution Strengthening Partitioning Behavior Dsc Calphad
Content Type	Text
Resource Type	Article

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