Microalloying and the mechanical properties of amorphous solids

H. George E. Hentschel, Michael Moshe, Itamar Procaccia*, Konrad Samwer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The mechanical properties of amorphous solids like metallic glasses can be dramatically changed by adding small concentrations (as low as 0.1%) of foreign elements. The glass-forming-ability, the ductility, the yield stress and the elastic moduli can all be greatly effected. This paper presents theoretical considerations with the aim of explaining the magnitude of these changes in light of the small concentrations involved. The theory is built around the experimental evidence that the microalloying elements organise around them a neighbourhood that differs from both the crystalline and the glassy phases of the material in the absence of the additional elements. These regions act as isotropic defects that in unstressed systems modify the shear moduli. When strained, these defects interact with the incipient plastic responses which are quadrupolar in nature. It will be shown that this interaction interferes with the creation of system-spanning shear bands and increases the yield strain. We offer experimentally testable estimates of the lengths of nano-shear bands in the presence of the additional elements.

Original languageAmerican English
Pages (from-to)1399-1419
Number of pages21
JournalPhilosophical Magazine
Volume96
Issue number14
DOIs
StatePublished - 12 May 2016
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 Informa UK Limited.

Keywords

  • Plasticity
  • amorphous solids
  • defects
  • geometry

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