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Open AccessArticle

Strengthening Mechanism of Titanium Boride Whisker-Reinforced Ti-6Al-4V Alloy Matrix Composites with the TiB Orientation Perpendicular to the Loading Direction

1
Department of Materials Processing, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
2
Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University, Hamamatsu 432-8561, Japan
3
Cooperative Research and Development Center for Advanced Materials (CRDAM), Institute for Materials Research (IMR), Tohoku University, Sendai 980-8577, Japan
4
Ariane Group, 78130 Les Mureaux, France
*
Author to whom correspondence should be addressed.
Materials 2019, 12(15), 2401; https://doi.org/10.3390/ma12152401
Received: 9 July 2019 / Revised: 25 July 2019 / Accepted: 25 July 2019 / Published: 28 July 2019
(This article belongs to the Special Issue Metal Matrix Composites: Experimental and Simulation)
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. View Full-Text
Keywords: titanium matrix composite; tensile property; whisker; strengthening mechanism titanium matrix composite; tensile property; whisker; strengthening mechanism
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MDPI and ACS Style

Kurita, H.; Suzuki, S.; Kikuchi, S.; Yodoshi, N.; Gourdet, S.; Narita, F. Strengthening Mechanism of Titanium Boride Whisker-Reinforced Ti-6Al-4V Alloy Matrix Composites with the TiB Orientation Perpendicular to the Loading Direction. Materials 2019, 12, 2401.

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