| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Influences of Ternary Solutes on Nanocrystalline Stability |
| Author(s) |
Gregory B. Thompson, Thomas Koenig , Ilias Bikmukhametov, Ankit Gupta, Garritt Tucker |
| On-Site Speaker (Planned) |
Gregory B. Thompson |
| Abstract Scope |
Nanocrystalline stability is nominally studied with binaries, but the use of a ternary solute adds an additional design variable. Using a Ni matrix - P solute alloy as a control, this work reports the effect of Cu and Co as additional solutes. In the Ni-P-Cu system, the Cu influences the kinetics of P partitioning as well as P cluster evolution in the nanostructure. The presence of P in the boundaries alters the mechanisms by which grain boundary deformation is accommodated, revealing a boundary composition and grain size dependence through atomistic simulations. For the Ni-P-Co system, the Co facilitates a pentagonal pyramid surface topology by lowering the stacking fault energy of the matrix. Using correlated atomic contrast imaging by electron microscopy with atom probe tomography, P appears to be spatially accommodated in the elastically strained regions which further assists in the stabilization the five-fold twin junctions. |