|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIV
||Property Enhancement of BMG Based Nanoglasses Prepared by RF Sputtering of Thin Films
||Hans J. Fecht, Pierre Denis
|On-Site Speaker (Planned)
So-called “nanoglasses” are considered non-crystalline solids which exhibit a glass-like atomic structure and contain a significant amount of internal interfaces. This metastable state of matter can be synthesized by thin film deposition from a BMG-type target at appropriate processing conditions. Remarkably, such BMG based nanoglass specimen clearly exhibit an anomaly of the specific heat typical for the nature of the glassy state. By variation of the argon back pressure the resulting nanostructures in the fully amorphous films can intentionally be varied from fully amorphous (2 microbar) to a nanoglobular structure / nanoglass (15 microbar) and to columnar structures at about 100 microbar Argon base pressure. While in general glassy structures lack ductility, the nanoglass state exhibits superior mechanical properties and, at the same time, achieves a remarkable level of ductility. Nanoindentation and stress measurements using cantilever beams clearly indicate some of the underlying mechanisms in ductilizing inherently brittle amorphous materials.
||Planned: Supplemental Proceedings volume