Size and volume-fraction effects of dispersed nano-crystalline particles on the elastic constants and flow stress of metallic glass

The particle size and crystal volume fraction effects on Young's modulus and the flow stress of metallic glass with nano-crystalline particles are studied in this paper using molecular dynamics simulations. The investigated volume fraction ranges from 0% (amorphous) to 100% (nano-crystalline me...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Modelling and simulation in materials science and engineering 2006-07, Vol.14 (5), p.S47-S54
Hauptverfasser: Matsumoto, R, Nakagaki, M
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:The particle size and crystal volume fraction effects on Young's modulus and the flow stress of metallic glass with nano-crystalline particles are studied in this paper using molecular dynamics simulations. The investigated volume fraction ranges from 0% (amorphous) to 100% (nano-crystalline metal), and the average particle diameters are 6 and 12 nm. The Young's modulus of the nano-composite is increased as the average particle size and the crystal volume fraction increase. We also demonstrate that the elastic constants can be accurately estimated by using a self-consistent compliance model based on the equivalent inclusion method. The flow stress is not affected by the particle size when the crystal volume fraction is lower than 60%. The particle size effects appear gradually for higher crystal volume fraction materials; this phenomenon is relevant to an increase in the fraction of the grain boundary in the entire interface.
ISSN:0965-0393
1361-651X
DOI:10.1088/0965-0393/14/5/S06