The prominent combination of ultrahigh strength and superior tensile plasticity in Cu–Zr nanoglass connected by oxide interfaces: A molecular dynamics study

Mao Zhang, Qiao Min Li, Jia Cheng Zhang, Guang Ping Zheng, Xin Yun Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

A novel Cu–Zr nanoglass consisting of glassy nano-cells connected by oxide interfaces is proposed. Compared to conventional nanoglasses, the novel oxide-connected nanoglass presents ultrahigh tensile strength and superior tensile plasticity at ambient temperature. Subjected to tensile loading, the oxide interfaces are found to promote the nucleation of shear transformation zones (STZs) due to the existence of excess free volume. Meanwhile, the strong bonding between metallic and oxygen atoms in the oxide interface makes it difficult for STZs to propagate through. Thus, the STZs are effectively proliferated and confined inside the cell interior without any mature shear band (SB) formed. The results provide new ideas for toughening metallic glasses with a decent combination of plasticity and strength, thus making it possible to overcome the longstanding strength-ductility trade-off dilemma.

Original languageEnglish
Pages (from-to)318-326
Number of pages9
JournalJournal of Alloys and Compounds
Volume801
DOIs
Publication statusPublished - 15 Sep 2019

Keywords

  • Interface
  • Molecular dynamics
  • Nanoglass
  • Oxidation
  • Shear transformation

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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