About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments VI
|
| Presentation Title |
Coupled Experimental and Modeling of the Interactions Between Dislocations, Precipitates, and Grain Boundaries from Atomic to Mesoscale |
| Author(s) |
Liming Xiong |
| On-Site Speaker (Planned) |
Liming Xiong |
| Abstract Scope |
In this talk, we will present coupled computational and experimental analysis on the interaction between dislocations, precipitates, and grain boundaries from atomistic to mesoscale. In experiments, samples are deformed under tension at temperatures ranging from 25 to 600ēC in a transmission electron microscope using a heating-straining holder. In parallel, concurrent atomistic-continuum (CAC) simulations are also performed to understand how a queue of dislocations interacts with the atomically structured precipitates and grain boundaries (GBs). One unique feature of CAC is to accommodate microscale slip together with atomically structured precipitates/GBs all within one model Our main findings are: (i) the sequential dislocation-precipitates is history dependent and has a mechanism cross-over from Orowan looping to cross-slip; (ii) the incoming screw dislocations migration along the GBs, but can transmit if they pile up against certain obstacles on the GB. These findings better explain precipitate and GB strengthening in alloys encountered in nuclear energy infrastructures. |