About this Abstract |
Meeting |
Superalloys 2021
|
Symposium
|
Superalloys 2021
|
Presentation Title |
Segregation of Solutes at Dislocations: A New Alloy Design Parameter for Advanced Superalloys |
Author(s) |
Lola Lilensten, Philipp Kürnsteiner, Jaber Mianroodi, Alice Cervellon, Johan Moverare, Mikael Segersäll, Stoichko Antonov, Paraskevas Kontis |
On-Site Speaker (Planned) |
Paraskevas Kontis |
Abstract Scope |
The interactions of solutes with crystal defects at near atomic level were investigated in five single crystal Ni-based superalloys deformed at temperatures between 850 and 1160 °C and various deformation conditions. These interactions, and consequently the composition of a particular solute that segregates at a crystal defect, are controlled by the type of the crystal defect, the deformation conditions, i.e. temperature and stress, and the overall alloy composition. Atomistic phase field simulations also reveal the effect of dislocation velocity on the amount of solutes that can segregate on dislocations. The observed plasticity-assisted redistribution of interacting solutes phenomena result in microstructural and chemical alterations, which are associated with recrystallization, rafting and the formation of topologically close-packed phases. Deciphering these interactions by enabling quantitative three-dimensional imaging of solutes at crystal defects with high sensitivity and spatial resolution, will allow to develop a solute-defect database that can be used as a key-design parameter for advanced superalloys. |
Proceedings Inclusion? |
Undecided |