About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials for High Temperature Applications: Next Generation Superalloys and Beyond
|
Presentation Title |
Deformation of the γ’’’-Ni2(Cr, Mo, W) Phase during Mechanical Testing |
Author(s) |
Thomas Mann, Michael Fahrmann, Michael Titus |
On-Site Speaker (Planned) |
Thomas Mann |
Abstract Scope |
Haynes® 244® alloy was designed as a high strength, low thermal expansion alloy which is strengthened by the γ’’’-Ni2(Cr, Mo, W) phase. Studies of the deformation behavior of the γ’’’-Ni2(Cr,Mo) precipitates present in Haynes® 242® alloy have shown that slip and twinning are the dominant deformation mechanisms at room temperature in standard tension and compression. The addition of W to Haynes® 244® alloy and the corresponding 10% increase in yield strength suggest a potential change in mechanisms and/or strong dependence of the planar defect energies with respect to W content. Density functional theory (DFT) calculations show the possibility of a favorable slip pathway for some variants, and a large barrier for slip in others that could preclude slip and favor twinning. TEM analysis of the deformed microstructure will be made and compared to the predictions of the first principles calculations as well as analyzed for the effect of variant orientation. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Temperature Materials, Mechanical Properties, Modeling and Simulation |