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

Nanoporous metallic glasses with tailored design


Nanoporous metallic glasses are heterostructure which also show enhanced ductility. Pores are soft heterogeneities which introduce strain concentrations and act as initiation sites for shear bands resulting in the formation of a highly organized pattern of multiple shear bands [1]. We investigated the mechanical properties of nanoporous heterostructures by means of two different approaches using atomistic and continuum modeling: molecular dynamics and finite element simulations, respectively [2]. By tailoring the pore architecture the deformation behaviour can be systematically tuned. Depending on the pore distribution in the heterostructure, the deformation mechanism can vary from a fracture-like deformation mode to localized deformation in one dominant shear band, and ultimately to homogeneous plastic flow mediated by a pattern of multiple shear bands.

[1]D. Sopu, C. Soyarslan, B. Sarac, S. Bargmann, M. Stoica, J. Eckert: Structure-property relationships in nanoporous metallic glasses, Acta Materialia 106 (2016), S. 199-207 URL
[2] B. Sarac, D. Sopu, E. Park, J.K. Hufenbach, S. Oswald, M. Stoica, J. Eckert: Mechanical and Structural Investigation of Porous Bulk Metallic Glasses, Metals 5 (2015) Nr. 2, S. 920-933 URL

Tensile deformations tests of nanoporous metallic glasses with different pore distribution. The deformation mechanism shows a clear transition from a catastrophic fracture to localized deformation in one dominant shear band, and ultimately to homogeneous plastic flow mediated by a pattern of multiple shear bands.