Abstract
In-situ Ti-TiB composites have been processed via two different routes: arc by melting elemental Ti and B and by direct laser deposition of a blend of elemental Ti and B powders using the laser-engineered net-shaping (LENS™) process. The conventionally cast composite exhibits a significantly coarser-scale microstructure as compared with the LENS™-deposited composite and consists of primary proeutectic TiB precipitates dispersed in an eutectic matrix. The microstructure of the LENS™-deposited Ti-TiB composite consists of a fine-scale homogeneous dispersion of primary TiB precipitates in an α-Ti matrix. In addition, a nanometer-scale dispersion of secondary TiB precipitates is formed in the α matrix. The hardness and modulus of these composites have been measured using nanoindentation techniques. The ability to produce such a fine dispersion of TiB precipitates in near-net-shape, near-full-density Ti-TiB composites processed using LENS™ could potentially be highly beneficial from the viewpoint of applicability of these metal-matrix composites.
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Banerjee, R., Genç, A., Collins, P.C. et al. Comparison of microstructural evolution in laser-deposited and arc-melted In-Situ Ti-TiB composites. Metall Mater Trans A 35, 2143–2152 (2004). https://doi.org/10.1007/s11661-004-0162-0
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DOI: https://doi.org/10.1007/s11661-004-0162-0