| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
|
| Presentation Title |
Analysis of the APB Energy in an Additive Manufactured Polycrystalline Ni-based Superalloy with High γ' Volume Fraction |
| Author(s) |
Larissa Heep, Casper Schwalbe, Christoph Heinze, Antonin Dlouhy, Catherine Mary Fiona Rae, Gunther Eggeler |
| On-Site Speaker (Planned) |
Larissa Heep |
| Abstract Scope |
Dislocation structures in the additive manufactured polycrystalline Ni-base superalloy CM247LC (~65 vol.% γ′) are characterized by TEM. The alloy was solution annealed and aged. In this state, a high density of dislocations forming networks at low angle grain boundaries and γ /γ′ interfaces were observed. A few dislocation segments were found in the γ′ phase. The networks contain two sets of dislocations at right angle to each other. Some networks are observed to run through the ordered γ′ phase where its structure changes. In the γ′ phase the lines of the network do not consist of single dislocations but of dislocation pairs with an antiphase boundary (APB) in between. A g-b analysis revealed that the dislocation segments are of screw character with burgers vectors of type 1/2 <101> in both γ and γ′. Based on this analysis, we could estimate the energy of the APB. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |