Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 23: Topical Session Bulk Nanostrucured Materials V - Microstructure and Characterization III
MM 23.5: Vortrag
Dienstag, 27. März 2012, 12:30–12:45, H 0107
Metallic Nanoglasses: Structure, Stability and Mechanical Properties — Karsten Albe1, •Yvonne Ritter1, Daniel Sopu1, and Herberg Gleiter2 — 1TU Darmstadt, FB Material- und Geowissenschaften, FG Materialmodellierung, Petersenstr. 32, D-64287 Darmstadt — 2KIT, Institut für Nanotechnologie, 76344 Eggenstein-Leopoldshafen
Grain boundaries are defined as 2-dimensional planar defects in crystalline materials. For the case of glasses, in contrast, there is no established concept of grain boundaries. If one considers, however, that a high degree of short- and medium-range order is also found in glassy materials, the definition of a grain boundary in a glass as an internal interface enclosing a domain of atoms becomes conceivable. Moreover, in bulk metallic glasses (BMGs) it is a well proven fact that planar defects do exist, namely in form of shear bands (SBs) induced by plastic deformation. Consequently, the existence of planar defects in metallic glasses introduced by other means than deformation is possible. In this contribution, we present a detailed analysis of the structure, stability and topology of interfaces in nanoglasses by means of molecular dynamics computer simulations. We address the role of free volume, short-range order and thermal stability and study the mechanical properties of nanoglasses. Moreover, analogies of the properties of interfaces and shear-bands will be addressed.