THE ANISOTROPY OF SURFACE DEFORMATION OF SAPPHIRE - CONTINUOUS INDENTATION OF TRIANGULAR INDENTER

R. Nowak, M. Sakai

Research output: Contribution to journalArticleScientificpeer-review

Abstract

An attempt is made to explain the anisotropy of indentation-induced deformation and fracture of sapphire for different crystallographic planes indented by a variously oriented triangular diamond indenter. The anisotropic surface deformation and fracture of the indented crystal are discussed using a new effective resolved shear stress (ERSS) model. The patterns of the surface traces of twins and cracks are predicted on the basis of the ERSS-calculations performed for all the slip and twinning systems which are potentially activated during room temperature indentation. The theoretical prediction of the ERSS model agrees very well with the observed hardness anisotropy. The present work is the first application of the continuous indentation test to the anisotropic surface deformation of single crystals.

Original languageEnglish
Pages (from-to)2879-2891
Number of pages13
JournalActa Metallurgica et Materialia
Volume42
Issue number8
DOIs
Publication statusPublished - Aug 1994
MoE publication typeA1 Journal article-refereed

Keywords

  • KNOOP MICROHARDNESS ANISOTROPY
  • CRYSTAL MNZN FERRITE
  • HARDNESS ANISOTROPY
  • SINGLE-CRYSTALS
  • SLIP PATTERNS
  • SPHERE INDENTATIONS
  • ENERGY PRINCIPLE
  • SILICON-CARBIDE
  • PLASTICITY
  • POLARITY

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