About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
|
Presentation Title |
The Effects of Defects on the Mechanical Properties of Au Microparticles |
Author(s) |
Tyler Flanagan, Oleg Kovalenko, Eugen Rabkin, Seok-Woo Lee |
On-Site Speaker (Planned) |
Tyler Flanagan |
Abstract Scope |
Mechanical properties of Au microparticles obtained by solid-state-dewetting method were characterized by microcompression tests. Our results revealed that Au microparticles with a top diameter larger than 400 nm exhibit a strong size effect in yield strength, while the strength of particles smaller than 400nm reaches saturation and is size-independent. Transmission electron microscopy revealed that the large microparticles contain several dislocations, while in smaller microparticles no dislocations were observed. Particle growth kinetics could be promoted by the presence of dislocations. Also, we discuss the two different size regimes in terms of the source-controlled plasticity model with a theoretical strength limit. Our numerical calculations not only capture the particles behavior observed in the experiment, but also predict the potential effects of sample geometry on the scaling law. This work shows that the microparticles produced by solid-state-dewetting method represent a convenient model system to study dislocation plasticity at small length scales. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |