| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Effects of Microstructures on Superelasticity of CaFe2As2 Single Crystal |
| Author(s) |
Shuyang Xiao, John Sypek, Sriram Vijayan, Paul Canfield, Mark Aindow, Seok-Woo Lee |
| On-Site Speaker (Planned) |
Shuyang Xiao |
| Abstract Scope |
The superelasticity of CaFe2As2 are strongly affected by defect structures. Understanding the role of defects can help improve its superelastic performance. In this study, we investigated the effects of microstructure on the superelasticity of [0 0 1]-oriented CaFe2As2 micropilllar using the in-situ micromechanical testing and transmission electron microscopy. Three different microstructures were prepared. An Sn-solution grown sample is nearly defect free and was used as a control sample. An quenched FeAs-solution grown sample has a dense rectangular network of screw dislocations which causes low-angle twist distortion, leading to the suppression of superplasticity. An annealed FeAs-solution grown sample fractured at a lower stress due to the presence of stress concentrator, nanoscale FeAs precipitates. In sum, superelasticity of CaFe2As2 is significantly influenced by defect structures, and our research outcomes will be generally useful to enhance the superelastic performance in ThCr2Si2-type intermetallic compounds which have the same type of crystal structure. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |