|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||Transition of Deformation Modes in Hollow Cu-Zr Metallic Glass Nanolattices
||Seok-Woo Lee, Mehdi J Zadeh, David Z Chen, Yong-Wei Zhang, Julia R Greer
|On-Site Speaker (Planned)
To harness ‘Smaller is more ductile’ behavior emergent at the nanoscale and to proliferate it onto materials with macroscale dimensions, we fabricated Cu60Zr40 metallic glass hollow nanolattices with the layer thicknesses of 120, 60 and 20 nm by using the infrared laser lithography followed by Cu-Zr co-sputtering and oxygen plasma etching. We demonstrate that the metallic glass nanolattices exhibit two distinct transitions in deformation mode as a function of thickness at room temperature; the brittle-to-ductile transition at the thickness between 120 nm and 60 nm, and the plastic-to-elastic transition at the thickness between 60 nm and 20 nm. In contrast, at 130 K, the nanolattices exhibit only one transition, brittle-to-elastic, at the thickness between 60 and 20 nm, and brittle-to-ductile transition does not exist. Molecular dynamics simulations and analytical models were used to interpret these unique transitions in terms of size effects on the plasticity and elastic instability.
||Planned: A print-only volume