Crystal-Like Rearrangements of Icosahedra in Simulated Copper-Zirconium Metallic Glasses and their Effect on Mechanical Properties

J. Zemp, M. Celino, B. Schönfeld, J.F. Löffler

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Abstract

Indications of the Cu2Zr Laves phase are observed in MD simulations of amorphous Cu64Zr36 upon isothermal holding just above the glass transition temperature. The structural evolution towards Cu2Zr is accompanied by an increase in the fraction of Cu-centered icosahedra, which demonstrates that a large icosahedral fraction does not just indicate structural relaxation. The crystal-like regions generate an increase in strength and Young's modulus, and a stronger localized shear band. A universal relation between the fraction of full icosahedra and their interconnectivity is found, and both can be modified simultaneously via changes of temperature or strain.
Original languageEnglish
Article number165501
Pages (from-to)-
JournalPhysical Review Letters
Volume115
Issue number16
DOIs
Publication statusPublished - 13 Oct 2015

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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