Strengthening mechanism of titanium boride whisker-reinforced Ti-6Al-4V alloy matrix composites with the TiB orientation perpendicular to the loading direction

Hiroki Kurita, Shiori Suzuki, Shoichi Kikuchi, Noriharu Yodoshi, Sophie Gourdet, Fumio Narita

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

We fabricated fully dense titanium boride (TiB) whisker-reinforced Ti-6Al-4V alloy matrix (Ti6Al4V-TiB) composites, with a homogeneous dispersion, a TiB orientation perpendicular to the loading direction (; two-dimensional random direction) and an intimate Ti/TiB interface without an intermediate interfacial layer in the Ti-6Al-4V alloy matrix, by spark plasma sintering. Microstructural analysis allows us to present the tensile properties of the Ti6Al4V-TiB composites with the theories for discontinuous fiber-reinforced composites. The Ti6Al4V-TiB 10 vol.% composite yielded a Young's modulus of 130 GPa, an ultimate tensile strength (UTS) of 1193 MPa and an elongation of 2.8%. The obtained experimental Young's modulus and UTS of the Ti6Al4V-TiB composites were consistent with the theoretical values estimated by the Halpin-Tsai and Shear-lag models. The good agreement between our experimental results and these models indicates that the TiB whiskers behave as discontinuous fibers in the Ti-6Al-4V alloy matrix.

Original languageEnglish
Article number2401
JournalMaterials
Volume12
Issue number15
DOIs
Publication statusPublished - 2019 Aug 1

Keywords

  • Strengthening mechanism
  • Tensile property
  • Titanium matrix composite
  • Whisker

ASJC Scopus subject areas

  • Materials Science(all)

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