|About this Abstract
||Materials Science & Technology 2012
||International Symposium on Defects, Transport and Related Phenomena
||Correlations between Grain Boundary Fracture Behavior and Structure under Different Doping Conditions
||Wanjun Cao, Animesh Kundu, Mark J. Mclean, Martin P. Harmer, Richard P. Vinci
|On-Site Speaker (Planned)
It has long been known that dopant segregation can exert great influence on grain boundary fracture behavior. However, it is difficult to understand the fundamental mechanisms at work without combining the fracture behavior and structural information from the same grain boundary. We have employed a micro-cantilever beam deflection technique to measure the fracture toughness of individual interfaces using a nanomechanical testing device inside an SEM. Bi-crystal magnesium aluminate spinel (MgAl<SUB>2</SUB>O<SUB>4</SUB>) grain boundaries have been studied to determine the effect of different doping conditions on the fracture behaviors. Atomic-resolution STEM images have been taken from the same boundaries to present direct experimental correlations among doping conditions, local atomic structures, and fracture behavior in doped (MgAl<SUB>2</SUB>O<SUB>4</SUB>) systems. By combining all these preliminary results, possible mechanisms are explored and discussed.