Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5456664 | Materials Science and Engineering: A | 2016 | 21 Pages |
Abstract
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+B4Câ4TiB+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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
S. Pouzet, P. Peyre, C. Gorny, O. Castelnau, T. Baudin, F. Brisset, C. Colin, P. Gadaud,