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C. Poletti, H.P. Degischer:
"Characterization of Ti-6Al-4V modified with B";
Poster: EUCOMAS 2009, Augsburg, Deutschland; 07-01-2009 - 07-02-2009; in: "European Conference on Materials in Aerospace 2009", VDI Wissensforum GmbH (ed.); (2009), 1 - 6.

Light weight design is required in aeronautics, because of the necessity to decrease fuel consumption.
This concept is demanding materials with high specific Young´s modulus and specific strength. In this
work, the thermo-mechanical properties of Ti-6Al-4V modified with 1%wt of B and 0.1%wt of C
produced by powder metallurgy is characterized and compared with a commercial Ti64 with globular
alpha microstructure. The addition of B results in the precipitation of TiB in situ, provoking also alpha
grain refinement. TiB needles precipitate in the beta field. Orthorhombic TiB is determined using Xray
diffraction, but no TiB2 is detected.
The Young´s modulus of Ti64 reinforced with TiB is 128GPa at room temperature and 113GPa at
350°C, agreeing with the Halpin Tsai model. The effects of the reinforcement on the strength were
characterized by means of compression tests and hardness measurements. The yield strength and the
strength at room temperature as well as at 350°C were increasing by the addition of 1wt%B and
0.1wt%C. TiB whiskers produce some strengthening by grain refinement and dispersion hardening.