| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
D-11: High Energy X-ray Characterization and Modeling of Residual Strain Evolution in a Ceramic-metal Composite |
| Author(s) |
John Ferguson, Armand J. Beaudoin, Gregory D. Scofield, J. Y. Peter Kob, Kelly E. Nygren, Yujie Wang, Kenneth H. Sandhage, Michael D. Sangid |
| On-Site Speaker (Planned) |
John Ferguson |
| Abstract Scope |
Residual stress, when superimposed with in-service loading, can significantly reduce the performance of a component. Ceramic-metal composites are susceptible to residual stresses due to their mismatch in thermal expansion properties of the ceramic and metallic phases. The Cu-WC material explored in the present study, provides a promising combination of thermal conductivity and strength properties, while demonstrating a counterintuitive result of improved strength and ductility after thermal cycling. This work quantifies the evolution of the residual elastic strains due to processing and cyclic thermal loading in a co-continuous Cu-WC composite through experimental high energy X-ray diffraction and kinetics-based modeling. Both methods provide consistent results that processing induced residual tensile stress in the copper phase is relieved upon subsequent thermal cycling. Through stress relaxation, this material maintains stability during thermal cycling. The illustrated kinetics of relaxation can inform ceramic-metal composite processors to minimize detrimental residual stress and improve performance of these materials. |