Investigation of the cutting mechanisms and the anisotropic ductility of monocrystalline sapphire

Yuta Mizumoto, Philipp Maas, Yasuhiro Kakinuma, Sangkee Min

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In this study, plunge-cut tests are conducted on single-crystal sapphire to investigate the brittle and ductile deformation mechanisms from the viewpoint of crystal anisotropy. The anisotropic deformation behaviour of the machined sapphire substrate manifests itself in the critical depth of cut and the diverse crack morphologies. Based on a resolved stress model that is adapted to the experimental procedure, weighted resolved stresses are computed, and the tendency of brittle-ductile transition depending on the peculiarities of the low-symmetry hexagonal crystal structure is discussed. Rhombohedral twinning is assumed to dominate the brittle-ductile transition.

Original languageEnglish
JournalCIRP Annals - Manufacturing Technology
DOIs
Publication statusAccepted/In press - 2017

Fingerprint

Sapphire
Ductility
Twinning
Crystal symmetry
Anisotropy
Crystal structure
Single crystals
Cracks
Crystals
Substrates

Keywords

  • Anisotropy
  • Machinability
  • Sapphire

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

Cite this

Investigation of the cutting mechanisms and the anisotropic ductility of monocrystalline sapphire. / Mizumoto, Yuta; Maas, Philipp; Kakinuma, Yasuhiro; Min, Sangkee.

In: CIRP Annals - Manufacturing Technology, 2017.

Research output: Contribution to journalArticle

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AB - In this study, plunge-cut tests are conducted on single-crystal sapphire to investigate the brittle and ductile deformation mechanisms from the viewpoint of crystal anisotropy. The anisotropic deformation behaviour of the machined sapphire substrate manifests itself in the critical depth of cut and the diverse crack morphologies. Based on a resolved stress model that is adapted to the experimental procedure, weighted resolved stresses are computed, and the tendency of brittle-ductile transition depending on the peculiarities of the low-symmetry hexagonal crystal structure is discussed. Rhombohedral twinning is assumed to dominate the brittle-ductile transition.

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