Thermomechanical properties of Ni-Al3O3 metal matrix composites produced by electroforming
| Autor: | M. Verelst, Abel Rousset, J.P. Bonino, M. Brieu |
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| Rok vydání: | 1995 |
| Předmět: |
Materials science
Annealing (metallurgy) Mechanical Engineering Metallurgy Oxide Condensed Matter Physics Microstructure Grain growth chemistry.chemical_compound chemistry Mechanics of Materials Ultimate tensile strength Electroforming General Materials Science Particle size Composite material Strengthening mechanisms of materials |
| Zdroj: | Materials Science and Engineering: A. 191:165-169 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/0921-5093(94)09648-1 |
| Popis: | NiAl3O3 metal matrix composites have been prepared by an electroforming process. Dispersed oxide particles greatly increase the strength of these materials over those of pure electroformed nickel. We have found that the strengthening mechanisms depend on the annealing treatment applied. Without treatment, the composite matrix exhibits compressive internal stresses which are related linearly to the yield strength. During the electrocrystallization process, the particles probably generate these internal stresses, which increase the dislocation density following in a way similar to classical cold rolling. When heat treatments up to 1000 °C are applied, the strengthening phenomenon is due to a particle-induced inhibition of matrix grain growth. This grain growth inhibition causes a strengthening according to the Hall and Petch law. This effect is all the more effective as the particle size is smaller. Heat treatment at very high temperature (1200 °C) in some cases results in a solid state reaction between the particles and the metal matrix, which allows a partial load transfer as commonly occurs in composites. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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