Additive layer manufacturing of titanium matrix composites using the direct metal deposition laser process

Sébastien Pouzet (1) , Patrice Peyre (1) , Cyril Gorny (1) , Olivier Castelnau (1) , T Baudin (2, 3) , F Brisset (3) , C Colin (4) , P. Gadaud (5)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux
2 CHIMSOL - Laboratoire de Physico-Chimie de l'Etat Solide
3 ICMMO - Institut de Chimie Moléculaire et des Matériaux d'Orsay
4 Mines Paris - PSL (École nationale supérieure des mines de Paris)
5 PPrime [Poitiers] - Institut Pprime [UPR 3346]

Titanium Matrix Composites (TMC's) containing various volume fractions of (TiB+TiC) particles have been deposited from powder feedstocks consisting of a blend of pre-alloyed (Ti-6Al-4V+B4C) powders, using the direct metal deposition (DMD) laser process and the in-situ chemical reaction 5Ti+B4C→4TiB+TiC. Process optimization has allowed to obtain a homogeneous distribution of tiny TiB whiskers within the Ti-6Al-4V α/β matrix, with a full solubilization of C for low B4C contents (0.5 wt% and 1.5 wt%), and the formation of a small amount of globular TiC particles at higher B4C content (3%). Comparisons with Ti-6Al-4V DMD walls revealed a substantial grain refinement on TMC's due to enhanced grain nucleation on TiB whiskers, even for low B4C contents. Last, mechanical investigations indicated an increase of 10–15% of Vickers hardness, and a constant 10% increase of Young modulus on a large temperature range (20–600 °C) for all B4C content

Mots clés: Composites - DMD - Laser- TiB - Titanium

Domaines: Sciences de l'ingénieur [physics]

Sébastien Pouzet, Patrice Peyre, Cyril Gorny, Olivier Castelnau, T Baudin, et al.. Additive layer manufacturing of titanium matrix composites using the direct metal deposition laser process. Materials Science and Engineering: A, 2016, 677, pp.171-181. ⟨10.1016/j.msea.2016.09.002⟩. ⟨hal-02140780⟩