Research group

Solidification Processes and Complex Structures


Contact person

Dr. Daniel Şopu

Phone: +49 351 4659 878
Email:  d.sopu(at)ifw-dresden.de


Team

Projects

Publications

Devices and techniques

Nanoglasses


A nanoglass is a new type of metallic glasses that can by synthesized by consolidating glassy powder. Nanoglasses consist of glassy grains connected by glass-glass interfaces. Glass-glass interfaces are characterized by a defective short-range order and an excess free volume. Similar to pre-deformed metallic glasses where pre-induced shear bands act as a softer phase with lower barriers for shear band nucleation, the glass-glass interfaces introduce strain concentrations which act as initiation sites for shear bands. We studied the deformation behavior of nanoglasses by tuning the size and compositions of glassy grains [1]. All these results indicated that glass-glass interfaces are soft heterogeneities which improve the mechanical properties of bulk metallic glasses.

[1] D. Sopu, and K. Albe, Beilstein J. Nanotech. 6 (2015) 537-545 URL

Local atomic shear strain for Cu64Zr36 BMG and NGs with grain sizes of 4 nm, 10 nm and 16 nm, respectively. Only those glassy atoms with an atomic strain higher than 20% are shown.