About this Abstract |
Meeting |
Superalloys 2024
|
Symposium
|
Superalloys 2024
|
Presentation Title |
Effects of Alloying Elements on Twinning in Ni-based Superalloys |
Author(s) |
Valery V. Borovikov, Mikhail I. Mendelev, Timothy M. Smith, John W. Lawson |
On-Site Speaker (Planned) |
Valery V. Borovikov |
Abstract Scope |
Micro-twinning is the major creep deformation mechanism in Ni-based superalloys at temperatures above 700 C. Recent experiments suggest that superlattice stacking faults in g phase may serve as the precursors to twin formation. Segregation of alloying elements to these precursors may have a significant effect on formation and extension of micro-twins. Using atomistic modeling we investigate and explain the effects of Nb and Cr alloying additions on these processes. The simulation shows that Nb increases the creep resistance which is mostly associated with impeding the reordering of the high energy double complex stacking fault. Cr, on the other hand, promotes twin growth, degrading the high temperature creep properties. These results can help to understand the effects of elemental composition of the alloy on creep resistance. |
Proceedings Inclusion? |
Definite: At-meeting proceedings |