In-situ fabrication of Ti-TiCx metal matrix composite by laser powder bed fusion with enhanced elastic modulus and superior ductility
| dc.contributor.author | Bernard, Gaëtan | |
| dc.contributor.author | Pejchal, Vaclav | |
| dc.contributor.author | Sereda, Olha | |
| dc.contributor.author | Logé, Roland E. | |
| dc.date.accessioned | 2025-04-03T07:08:13Z | |
| dc.date.available | 2025-04-03T07:08:13Z | |
| dc.date.issued | 2024-11-27 | |
| dc.description.abstract | The production of high stiffness Ti-based Metal Matrix Composites (Ti-MMCs) displaying significant ductility is extremely challenging due to the high reinforcement content required. This study outlines the production process of stiffness-driven Ti-TiC MMCs displaying a remarkable ductility. The process consists in powder Mechanical Blending, Laser Powder Bed Fusion (LPBF), and a heat treatment. A TiC fraction of more than 20 vol% was formed in-situ through the reaction of titanium with carbon during the LPBF process. The as-built sub-stoichiometric TiC dendrites are converted in equiaxed TiC grains during the heat treatment. The TiC C/Ti ratio was found to be close to 0.5 in as-built conditions, and 0.7 in heat treated conditions, resulting in an effective reinforcement content nearly twice the one expected for stoichiometric TiC, leading to stronger reinforcement. The mechanical analysis revealed a Young’s modulus of up to 149 GPa and total elongations of up to 2.8 %. The former represents a 27 % improvement compared to commercially pure Titanium and the latter exceeds by 115 % reported values for LPBF Ti-MMCs with similar Young’s modulus. It is enabled by the in-situ formation of defect-free TiC reinforcements during the LPBF process combined with their globularisation through heat treatment. | |
| dc.description.sponsorship | This research was partially funded by European Space Agency, grant number 4000132091/20/NL/MH/ac. | |
| dc.identifier.citation | Materials & Design, Volume 248, 113499 | |
| dc.identifier.doi | https://doi.org/10.1016/j.matdes.2024.113499 | |
| dc.identifier.issn | 0264-1275 | |
| dc.identifier.uri | https://hdl.handle.net/20.500.12839/1653 | |
| dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S0264127524008748 | |
| dc.rights | CC0 1.0 Universal | * |
| dc.rights.uri | http://creativecommons.org/publicdomain/zero/1.0/ | * |
| dc.title | In-situ fabrication of Ti-TiCx metal matrix composite by laser powder bed fusion with enhanced elastic modulus and superior ductility | |
| dc.type | Journal Article | |
| dc.type.csemdivisions | BU-T | |
| dc.type.csemresearchareas | Additive Manufacturing |