Mechanical Properties of Cubic-BN(111) Bulk Single Crystal Evaluated by Nanoindentation

Momoko Deura, Kentaro Kutsukake, Yutaka Ohno, Ichiro Yonenaga, Takashi Taniguchi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


We performed nanoindentation measurements on the (111) plane of a cubic boron nitride (c-BN) bulk single crystal and a c-BN sintered compact at room temperature to evaluate the intrinsic mechanical properties of c-BN. Our load–penetration depth curves for bulk single crystal feature a low noise level and small variation in the data. These features reflect the perfect phase purity and high crystal coherency of the c-BN bulk crystal. The hardness and Young's modulus are determined to be 61 ± 1 and 1070 ± 30 GPa, respectively. These values are larger than those corresponding to the c-BN sintered compact. The obtained Young's modulus followed a similar trend to previous experimental and calculation studies. Hence, we demonstrate the effectiveness of this evaluation method based on high-quality bulk single crystals. We also compared the mechanical properties with our results for wurtzite boron nitride (w-BN) bulk crystal.

Original languageEnglish
Article number1700473
JournalPhysica Status Solidi (B): Basic Research
Issue number5
Publication statusPublished - 2018 May


  • bulk single crystal
  • cubic boron nitride (c-BN)
  • mechanical properties
  • nanoindentation


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