Polycrystalline γ-boron: As hard as polycrystalline cubic boron nitride

Jiaqian Qin, Norimasa Nishiyama, Hiroaki Ohfuji, Toru Shinmei, Li Lei, Duanwei He, Tetsuo Irifune

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

The Vickers hardness of polycrystalline γ-boron (γ-B) was measured using a diamond indentation method. The elastic properties of polycrystalline γ-B were determined using an ultrasonic measurement method. Under a loading force of up to 20 N our test gave an average Vickers hardness in the asymptotic hardness region around 30.3 GPa. We also measured the hardness and elastic properties of polycrystalline β-B and cubic boron nitride-Ti 3SiC 2 (PcBN) for comparison. The hardness and elastic properties of polycrystalline γ-B were found to be very close to those of PcBN.

Original languageEnglish
Pages (from-to)257-260
Number of pages4
JournalScripta Materialia
Volume67
Issue number3
DOIs
Publication statusPublished - 2012 Aug
Externally publishedYes

Keywords

  • Elastic modulus
  • Fracture toughness
  • Hardness
  • Polycrystalline boron

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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