About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-53: Deformation Mechanisms in Immm-Ni2(Cr,Mo,W)-containing Haynes® 244® Superalloy |
Author(s) |
Thomas Mann, Michael Farhmann, Michael Titus |
On-Site Speaker (Planned) |
Thomas Mann |
Abstract Scope |
Haynes® 242® and 244® alloys are strengthened by a Immm-Ni2(Cr, Mo, W) body-centered orthorhombic (BCO) intermetallic phase. Due to the low symmetry of this phase, the deformation mechanisms are expected to be complex, and a myriad of planar defects are predicted to be observed on the {013} planes, which are nearly co-planar to the matrix {111} plane. These defects include those analogous to the γ’ phase: superlattice intrinsic/extrinsic stacking faults, antiphase boundaries, and complex stacking faults. To assist in the analysis of favorable shear pathways of dislocations through the precipitate, we utilized ab-initio density functional theory calculations to determine the planar defect energies. The energy of these faults was determined by creating a supercell with the c axis parallel to the {013} plane normal and tilting the cell along the slip vector associated with the planar defect. These calculations were then used to create a Generalized Stacking Fault Energy surface. |
Proceedings Inclusion? |
Undecided |