Nanoindentation hardness and atomic force microscope imaging studies of pressure-quenched zirconium metal

Academic Article

Abstract

  • We have carried out mechanical property measurements on zirconium metal compressed in a diamond anvil cell to 19 GPa at room temperature with subsequent quenching to room pressure. The irreversible transformation from the ambient hexagonal-close-packed phase to the simple hexagonal ω phase (AIB2 structure) is confirmed by synchrotron energy dispersive x-ray diffraction followed by nanoindentation of the pressure-quenched sample. We document an 80% increase in hardness as a consequence of the pressure-induced transformation to the ω phase at room temperature. This is a large increase for a metallic phase transformation and can be attributed to the presence of sp2-hybrid bonds forming graphite-like nets in the (0001) plane of the AIB2 structure. Atomic force microscopy of the indents shows that a plastic deformation of 2 μm in depth was achieved with a force of 200 mN. © 2000 American Institute of Physics.
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Catledge SA; Spencer PT; Vohra YK
  • Start Page

  • 3568
  • End Page

  • 3570
  • Volume

  • 77
  • Issue

  • 22