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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 A Nickel-based Superalloy Dual-reinforced by L12 Ni3Al and D022 Ni3V Ordered-fcc Precipitates
Author(s) Alexander J. Knowles, Lucy Reynolds, Vassili Vorontsov, David Dye
On-Site Speaker (Planned) Alexander J. Knowles
Abstract Scope Nickel based superalloys are widely used as high temperature materials owing to their combination of strength, creep, toughness, environmental resistance and microstructural stability in the 650–1200C range. These exploit an fcc Ni matrix with L12 Ni3Al precipitates. However, there are other ordered-fcc structures where greater understanding is needed, for example, D022, as employed in Inconel 718, however, metastable Ni3Nb may decompose to D0a. Here a nickel based superalloy has been produced reinforced by two different ordered-fcc intermetallic compounds, γ' L12 Ni3Al and γ’’ D022 Ni3V. Primary ageing at 900–1000C precipitated spherical L12 Ni3Al, whose volume fraction and size were controlled by ageing temperature and time. Secondary ageing at 700C precipitated laths of D022 Ni3V. The dual precipitation increased hardness by ~85 HV, with ∼500 MPa compressive strength at 800C. Electron microscopy studied the Ni3Al precipitation and confirmed the form of the secondary Ni3V precipitates and their long-term stability.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Nickel-based Superalloy Dual-reinforced by L12 Ni3Al and D022 Ni3V Ordered-fcc Precipitates
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
Coarsening Kinetics and Mechanical Properties of fcc Compositionally Complex Alloys Strengthened by L12 Precipitates
Correlative High-resolution Characterization of the Early Stages of Precipitation During Direct Aging of Alloy 718
D022 + D022’ Dual-phase Microstructure in As-cast Al-Mo-Ti Alloys
Elevated Temperature Microstructure Evolution and Properties of an Equiatomic CrCoNi Superalloy Containing Al,Ti
FCC High-entropy Alloys Strengthened with L12 Precipitates: Alloying Strategies and Highlights
High Temperature Microstructural Stability Mechanisms Revealed by Microscopy in Al-Cu-Mn-Zr Alloys
Impact of L12-phase Dispersoids on the Hardening Behavior of Multi-phase Strengthened Aluminum Alloys
In-situ Transmission Electron Microscopy Investigation of Continuous Precipitation of Ni3Mo in a Ni-25Mo-8Cr Alloy Formed by Direct Current Magnetron Sputtering
Mapping the Mechanical Property Space of Al-Cu-Mn-Zr (ACMZ) Cast Aluminum Alloys with Superior Microstructural Stability
Nanoscale Precipitation-strengthened Al-Er-Sc-Zr-(V,Nb,Ta) Alloys
Novel fcc-Cu Matrix Based High Temperature Alloys Strengthened by Ordered Precipitates
Novel Microstructural Template Based on Ordered Intermetallic Precipitation in FCC Based Complex Concentrated Alloys
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
Sc-free Nanoprecipitate-strengthened Aluminum Alloys with Exceptional Creep Resistance
Stress Induced Sensitization in HAZ of 304 LN Austenitic Stainless Steel
The Quantitative Model for Heat Treatment Parameters and Gamma Prime Variations on Nickel-base Superalloys

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