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- Title
Microstructure Evolution and Composition Control During the Processing of Thin-Gage Metallic Foil.
- Authors
Semiatin, S.; Gross, M.; Matson, D.; Bennett, W.; Bonham, C.; Ustinov, A.; Ballard, D.
- Abstract
The manufacture of thin-gage superalloy and gamma-titanium-aluminide foil products via near-conventional thermomechanical processing and two different vapor-deposition methods was investigated. Thermomechanical processing was based on hot-pack rolling of plate and sheet. Foils of the superalloy LSHR and the near-gamma titanium aluminide Ti-45.5Al-2Cr-2Nb made by this approach exhibited excellent gage control and fine two-phase microstructures. The vapor-phase techniques used magnetron sputtering (MS) of a target of the desired product composition or electron-beam physical vapor deposition (EBPVD) of separate targets of the specific alloying elements. Thin deposits of LSHR and Ti-48Al-2Cr-2Nb made by MS showed uniform thickness/composition and an ultrafine microstructure. However, systematic deviations from the specific target composition were found. During subsequent heat treatment, the microstructure of the MS samples showed various degrees of grain growth and coarsening. Foils of Ti-43Al and Ti-51Al-1V fabricated by EBPVD were fully dense. The microstructures developed during EBPVD were interpreted in terms of measured phase equilibria and the dependence of evaporant flux on temperature.
- Subjects
HEAT resistant alloys; MICROSTRUCTURE; THERMOMECHANICAL treatment; METALS; ELECTRON beam curing; MAGNETRON sputtering
- Publication
Metallurgical & Materials Transactions. Part A, 2012, Vol 43, Issue 12, p4819
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-012-1255-9