About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fracture and Deformation Across Length Scales: Celebrating the Legacy of William Gerberich
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| Presentation Title |
In search of stress-induced complexion transitions in nanocrystalline metals |
| Author(s) |
Maarten P. De Boer, Md Shariful Islam, Xipeng Li, Wen-Yu Chen, Sebastian Calderon, Elizabeth Dickey, Gregory Rohrer |
| On-Site Speaker (Planned) |
Maarten P. De Boer |
| Abstract Scope |
The thermodynamic phase of a material is determined by composition, temperature, and pressure. Grain boundaries also assume a thermodynamic phase, known as a complexion. In ceramic materials, complexions transition from one state to another depending on composition and temperature. In metals there is also evidence of complexion transitions. We have recently directly observed via high resolution scanning transmission electron microscopy (HRSTEM) a reversible temperature-induced solvent segregation to boundaries in a Au-Pt alloy. Complexion transitions that are governed by stress are predicted theoretically, but have not yet been observed in metals or ceramics. In turn, such transitions are likely to alter mechanical behavior. In this talk, I will describe our search for stress-induced complexions in this Au-rich Au-Pt alloy using a newly-developed nanomechanical test platform. The platform enables direct TEM observation under controlled temperature and stress, and simultaneously allows high-resolution thin film creep measurements of this nanocrystalline alloy. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Mechanical Properties, Characterization |