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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Nix Award and Lecture Symposium: Mechanistic Understanding of Mechanical Behavior Across Length Scales
Presentation Title The Dynamics of Precipitate Shearing in fcc/L1<sub>2</sub> Alloys
Author(s) Jean-Charles Stinville, Michael S. Titus, Daniel S. Gianola, Tresa M. Pollock
On-Site Speaker (Planned) Jean-Charles Stinville
Abstract Scope Intermetallic precipitates are among the most effective strengthening agents for structural metallic alloys. Ordered intermetallic precipitates are generally resistant to shearing by dislocations, resulting in strengthening, but are also effective for damage tolerance since they will ultimately deform plastically in the presence of high local stresses. Ni-base superalloys are prototypical examples wherein L12 precipitates strengthen the solid solution nickel alloy matrix to high fractions of melting. The contribution of precipitate shearing to overall plasticity in Ni-base alloys has to date been assessed via post-deformed transmission electron microscopy studies of mechanically deformed samples. We report here on a novel in-situ approach to studying precipitate shearing and faulting in superalloys. This approach integrates MEMs straining stages with a STEM detector in the SEM, enabling dynamic observations of defects and their interactions with precipitates, faults and boundaries, studied with diffraction contrast. New insights on the frequency of shearing and the faulting mechanisms will be reported and the implications for alloy design will be discussed.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Amorphization: A New Dislocationless Deformation Mechanism?
Early Nanoscale Dislocation Processes and Two Creep Rate Minima in SX Ni-base Superalloys
Hybrid Nanocomposites at the Extreme Limits of Molecular-scale Confinement
Measurement of Mechanical Properties by Nanoindentation: Recent Innovations in Testing Methodology
Mechanical Properties of High Entropy Alloys
Nix Award Lecture: Damage Tolerance in Materials
The Dynamics of Precipitate Shearing in fcc/L12 Alloys
The Role of Solutes and Short Range Order (SRO) in the Deformation of α-Ti Alloys
Toughening and Energy Dissipation in Metamaterials

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