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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Microstructural Template Consisting of a Face-Centered Cubic Matrix with Ordered Precipitates: Microstructural Evolution and Properties
Presentation Title Coarsening and Creep Behavior of Co-Ni-Al-W-Ti-Ta-B Superalloy with High γ′ Solvus Temperature
Author(s) Fei Xue, Dingwen Chung, Eric Lass, David N Seidman, David C Dunand
On-Site Speaker (Planned) Fei Xue
Abstract Scope Increasing the γ′ solvus temperature of Co-base superalloys is an important challenge for their development and eventual commercial use. This work investigates two multinary Co-base alloys, with 0.5 at.% difference in Ti-content, which exhibit a high γ′ solvus temperature of 1196 and 1211C. The γ-γ′ two-phase microstructure with ~80% γ′(L12) precipitates, observed in both alloys, coarsens slowly upon annealing at 900 and 1000C for up to 1,000 h (and at 1100C for up to 168 h), with the low Ti-content alloy showing a slightly less coarsened γ′ precipitates. No secondary phase precipitates are detected, even after the long-term annealing. Atom probe tomography shows enrichment of Ni, Al, W, Ti, Ta and B in the γ′ precipitates after annealing at 900C for 168 h in both alloys. Comparable creep properties are found in both alloys at 850 and 900C. A further composition design with Cr additions to these alloys is presented.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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Alloying for Corrosion Resistance: the Effect of Manganese and Silicon on a Polycrystalline Nickel-based Superalloy
Coarsening and Creep Behavior of Co-Ni-Al-W-Ti-Ta-B Superalloy with High γ′ Solvus Temperature
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Ordered Precipitates and Mechanical Properties of Nickel-base Superalloys Studied by Analytical Scanning and Transmission Electron Microscopy
Precipitation and Deformation Mechanisms of γ’/γ” Co-precipitates in Alloy 718
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The Quantitative Model for Heat Treatment Parameters and Gamma Prime Variations on Nickel-base Superalloys

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