| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Ceramics: Fundamental Structure—Property—Performance Relationships
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| Presentation Title |
On the Role of Plasticity in High Heating Rate Sintering: Does Flash Sintering Involve Plastic Flow? |
| Author(s) |
Rheinheimer Wolfgang, Xin Li Phuah, Lukas Porz, Michael Scherer, Jaehun Cho, Haiyan Wang |
| On-Site Speaker (Planned) |
Rheinheimer Wolfgang |
| Abstract Scope |
During flash sintering, very rapid densification of a ceramic powder compact occurs during a thermal runaway induced by electrical power dissipation from an applied voltage and current. After flash sintering of SrTiO3, a high dislocation density was observed by transmission electron microscopy. Uniaxial compression revealed a much higher deformation rates after flash sintering compared to conventional sintering, likely caused by the high dislocation density. Based on these findings, it is argued that the dislocations are generated and migrate during sintering resulting in plastic flow. This becomes possible by the high heating rates, which conserve high driving forces for sintering up to high temperatures by minimizing neck growth at lower temperatures. In this light, the most important parameter of flash sintering is the extremely high heating rate. Beyond extending our understating of flash sintering, the presented framework offers new perspectives for materials engineering by introducing dislocations for enhanced functional properties. |