Mechanisms of Failure in Nanoscale Metallic Glass

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

54 Scopus Citations
View graph of relations

Author(s)

  • X. Wendy Gu
  • Mehdi Jafary-Zadeh
  • David Z. Chen
  • Yong-Wei Zhang
  • Julia R. Greer

Detail(s)

Original languageEnglish
Pages (from-to)5858-5864
Journal / PublicationNano Letters
Volume14
Issue number10
Online published8 Sep 2014
Publication statusPublished - 8 Oct 2014
Externally publishedYes

Abstract

The emergence of size-dependent mechanical strength in nanosized materials is now well-established, but no fundamental understanding of fracture toughness or flaw sensitivity in nanostructures exists. We report the fabrication and in situ fracture testing of ∼70 nm diameter Ni-P metallic glass samples with a structural flaw. Failure occurs at the structural flaw in all cases, and the failure strength of flawed samples was reduced by 40% compared to unflawed samples. We explore deformation and failure mechanisms in a similar nanometallic glass via molecular dynamics simulations, which corroborate sensitivity to flaws and reveal that the structural flaw shifts the failure mechanism from shear banding to cavitation. We find that failure strength and deformation in amorphous nanosolids depend critically on the presence of flaws.

Research Area(s)

  • flaw sensitivity, fracture, mechanical properties, metallic glass, molecular dynamics, notch sensitivity, Size effect

Citation Format(s)

Mechanisms of Failure in Nanoscale Metallic Glass. / Gu, X. Wendy; Jafary-Zadeh, Mehdi; Chen, David Z.; Wu, Zhaoxuan; Zhang, Yong-Wei; Srolovitz, David J.; Greer, Julia R.

In: Nano Letters, Vol. 14, No. 10, 08.10.2014, p. 5858-5864.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal