Spray forming and co-injection of particulate reinforced TiAl/TiB{sub 2} composites
- Univ. of California, Irvine, CA (United States). Dept. of Chemical, Biochemical Engineering and Materials Science
An intermetallic matrix composite TiAl/TiB{sub 2} was spray formed with co-injection using an induction skull melting/spray forming technique. The volume percentage of reinforcement in the spray formed materials is approximately 35%. The microstructure of the spray formed composite is characterized by fine grained, equiaxed fully lamellar structures, with an average linear grain size of approximately 40 {micro}m. The distribution of TiB{sub 2} in the composite exhibits a layered morphology. On the basis of experimental observations of TiB{sub 2} distribution in oversprayed powders and related numerical analysis, this phenomenon was attributed to the segregation of TiB{sub 2} particles to the exterior region of the droplets and the subsequent deformation of the droplets along the direction normal to the substrate during impingement. Numerical analysis suggests that the most likely approach to improve the homogeneity of the distribution of TiB{sub 2} in the deposit is to decrease the co-injector/atomizer distance.
- Sponsoring Organization:
- Department of the Army, Washington, DC (United States)
- OSTI ID:
- 599701
- Journal Information:
- Acta Materialia, Vol. 45, Issue 12; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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