| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Ductile Deformation of Nearly Monoatomic Metallic Glass |
| Author(s) |
Mehrdad Toussi Kiani, Wendy Gu |
| On-Site Speaker (Planned) |
Mehrdad Toussi Kiani |
| Abstract Scope |
Metallic glasses (MGs) exhibit a size-dependent brittle-to-ductile transition where deformation occurs according to homogenous flow rather than shear bands. This behavior has been observed for numerous MGs independent of composition and atomic structure. Here, we present in situ SEM compressions of nearly monoatomic nickel nanoparticles with unusual plastic behavior. These nanoparticles are synthesized colloidally by rapidly reducing metallic ions. Synchrotron X-ray diffraction shows the nanoparticles have a large free volume (>6%). 90 nm Ni nanoparticles exhibit two regions in the compressive force-displacement curve: linear elastic-plastic loading followed by a non-linear increase in force. 190 nm Ni nanoparticles exhibit the same initial region but different second region characterized by undulations in the force-displacement curve. In both sizes, at most one rapid slip event is observed at the transition between the two regions. We relate this deformation behavior to the high free volume in monoatomic MGs and mechanisms for shear band propagation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |