About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
Local Structural Ordering Affects the Toughening Ability of Amorphous Grain Boundary Complexions |
Author(s) |
Pulkit Garg, Timothy J. Rupert |
On-Site Speaker (Planned) |
Pulkit Garg |
Abstract Scope |
Amorphous grain boundary complexions act as toughening features within a microstructure as they can alter both crack nucleation and crack growth by efficiently absorbing dislocations. In this talk, we hypothesize that the toughening ability of complexions is determined by their local structural order and test this idea using atomistic simulations in Cu-Zr bicrystals. The structural order at amorphous-crystalline interfaces is found to be inversely related to incompatibility between the two confining grains, meaning that large incompatibilities between the confining crystals lead to a less ordered amorphous-crystalline interface regions. The variations in local structural ordering of amorphous-crystalline interfaces alter their interactions with the plastic strain brought by the incoming dislocations, with some amorphous complexions being more resistant to crack nucleation and growth as compared to the others. Thus, the entire grain-complexion-grain system must be considered to understand the toughening abilities of complexions and design nanocrystalline alloys with improved ductility and strength. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Mechanical Properties, Copper / Nickel / Cobalt |