Characterization of novel borides in Ti-Nb-Zr-Ta + 2B metal-matrix composites
- Department of Materials Science and Engineering, Ohio State University, Columbus, OH (United States)
- Department of Materials Science and Engineering, University of North Texas, Denton, TX (United States)
Metal-matrix composites consisting of a complex quaternary Ti-35Nb-7Zr-5Ta alloy reinforced by borides have been successfully deposited from a powder feedstock consisting of a blend of elemental titanium, niobium, zirconium, tantalum, and, titanium diboride (TiB{sub 2}) powders, using the laser engineered net-shaping (LENS{sup TM}) process. The microstructures of the as-deposited composites have been characterized using scanning electron microscopy, orientation microscopy, and, transmission electron microscopy. Both primary and eutectic boride precipitates, exhibiting the orthorhombic B27 structure, are observed in these as-deposited composites. The complex primary borides exhibit an unusual compositional variation within the same precipitate, which has been investigated in detail using site-specific characterization with a transmission electron microscope. The ability to form near-net shape components using the Laser Engineered Net Shaping process makes these laser-deposited composites promising candidates for wear-resistant applications in biomedical implants.
- OSTI ID:
- 21192595
- Journal Information:
- Materials Characterization, Vol. 60, Issue 2; Other Information: DOI: 10.1016/j.matchar.2008.07.011; PII: S1044-5803(08)00208-8; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
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