Effects of temperature and grain size on the mechanical properties of polycrystalline quartz

Zhaoyang Ma, Ranjith Pathegama Gamage, Chengpeng Zhang

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13 Citations (Scopus)

Abstract

In this article, a series of molecular dynamics (MD) simulations were performed to investigate the impacts of indentation size, grain size and temperature on the mechanical properties of polycrystalline α-quartz under quasi-static nanoindentation with conical indenter. Results from MD simulations show that the hardness and Young's modulus are more sensitive to the temperature and penetration depth than grain size. Von Mises shear strain and the volumetric strain were calculated to depict the plastic deformation and it was found that plastic deformation becomes more dominate at higher temperatures and indentation sizes for polycrystalline α-quartz. The deformation mechanism is dominated by the grain boundary sliding instead of intragranular dislocation control at small grain size (<10 nm). This work enriches the atomic-level understanding the mechanical properties of α-quartz under nanoindentation tests, which helps to uncover the mechanism of polycrystalline solids breakage and deformation under various conditions.

Original languageEnglish
Article number110138
Number of pages10
JournalComputational Materials Science
Volume188
DOIs
Publication statusPublished - 15 Feb 2021

Keywords

  • Hardness
  • Molecular dynamics
  • Nanoindentation
  • Polycrystalline
  • Quartz
  • Young's Modulus

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