| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior Related to Interface Physics IV
|
| Presentation Title |
Understanding the Relationship between Grain-Boundary Segregation and Mechanical Properties using Interfacial Phase Diagrams |
| Author(s) |
Chongze Hu |
| On-Site Speaker (Planned) |
Chongze Hu |
| Abstract Scope |
The segregation of solutes or impurities at grain boundaries (GBs) significantly influences the interfacial behaviors and subsequent properties of polycrystalline materials. In this talk, I will discuss the effects of solute segregation on the mechanical behaviors of GBs in two materials systems: Al-Ga and Cu-Ag binary alloys. Al-Ga is a classic modeling system for GB embrittlement, where our molecular dynamic (MD) simulations indicated that Ga segregation can induce a ductile-to-brittle transition in Al GBs. In contrast, this behavior was not identified in Ag-segregated Cu GBs due to the highly ductile nature of these GBs. By developing interfacial diagrams of thermodynamic and mechanical properties for both two systems, we found that GB mechanical properties are influenced not only by segregation, but also by segregation-induced GB disordering and changes in free volume. These studies uncover the structure-property relationships of GBs and suggest a new strategy for alloy design via GB engineering. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Thin Films and Interfaces |