About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Behavior of Shape Memory Ceramic-Metal Matrix Composites under Mechanical and Thermal Stimuli |
| Author(s) |
Donald Erb, Nikhil Gotawala, Hang Yu |
| On-Site Speaker (Planned) |
Donald Erb |
| Abstract Scope |
While zirconia-based ceramics exhibit potential for shape memory and superelastic properties at micron scales, scaling up to the bulk level is challenging due to significant shear strain during phase transformation, often resulting in catastrophic failure. By embedding zirconia particles within metals using solid-state additive manufacturing to fabricate metal matrix composites, these shape memory particles can retain their functionality within bulk composites. These fully-dense composites withstand high compressive loads without cracking and retain functional behavior facilitated by thermally and mechanically triggered martensitic transformations. Stress-induced martensitic transformation is observed in bulk-scale composites, but only in certain metal matrices; micromechanics modeling links this to differences in load transfer and strain hardening capabilities of the metal matrices. Complementary to global transformation characterization, Raman mapping reveals that transformation typically initiates at the particle-matrix interface. Together, these results establish a potential materials selection framework for multi-functional metal-shape memory ceramic composites with tunable transformation responses. |