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Enhanced Strength–Ductility Synergy in Printed TiC/Ti Composites via Developing Homogeneous C-Coated Ti Powder
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DOI：10.1111/jace.70866.png)
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Abstract
En 中文
Employing Ti and C powder blends for laser powder bed fusion (LPBF) of TiC/Ti composites usually generates coarse primary TiC dendrites and heterogeneous carbide distributions due to powder inhomogeneity, leading to limited strengthening efficiency and a pronounced strength–ductility trade-off. Aiming at this issue, a homogeneous C-coated Ti powder was developed by fluidized-bed chemical vapor deposition (FBCVD) in this study. This homogeneous powder feedstock effectively suppresses C segregation and thus inhibits dendritic TiC formation during the LPBF process. Meanwhile, this new powder enables the carbide precipitation pathways to be tunable by controlling the C content, which produces various types, morphologies, and spatial distributions of carbides. At low C contents (below 0.50 wt.%), solid-solution precipitation dominates and induces the formation of intragranular Ti8C5 platelets and TiC particles. This increases the ultimate tensile strength (UTS) by over 27% without a pronounced loss of ductility, suggesting a good strength–ductility synergy. At higher C contents, the microstructure is dominated by eutectic lamellae, resulting in a remarkable reduction in ductility. This work provides design criteria for tailoring reinforcement architectures to achieve strength–ductility synergy in LPBF-fabricated TiC/Ti composites.
Keywords:
composite powder
mechanical properties
powder processing
TiC
titanium matrix composite
Journal
IF:
3.8
Papers:
1.7W
Citations:
5.4W
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