| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Thermodynamics of Materials in Extreme Environments
|
| Presentation Title |
Dissipative Kinetic Models: Do we Require Deeper Understanding of Local Thermodynamics? |
| Author(s) |
Shen J. Dillon |
| On-Site Speaker (Planned) |
Shen J. Dillon |
| Abstract Scope |
Kinetic models describing microstructure evolution for processes such as grain growth or sintering assume steady-state response where an average driving force is proportional to the instantaneous rate. Such models assume constant volume conditions to make derivations tractable and define size dependence through resulting scaling laws. These models predict continuous response in time and relatively deterministic response, if the properties and geometries of all features are accurately defined. Significant and growing experimental and computational evidence indicates that microstructures evolution is typically not continuous in time and highly stochastic. This response can result from the presence of large barriers in the system, i.e. those much larger than the average driving force. Systems can overcome large local barriers via interfacial energy dissipation or stress concentration. Such models, however, are inherently dissipative and require new types of models to solve. This talk will discuss new models applying such ideas to grain growth and sintering. |