Steady state and transient creep properties of an aluminum alloy reinforced with alumina fibers |
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| Affiliation: | 1. Department of Physical Metallurgy, CENIM-CSIC, Avda. Gregorio del Amo 8, Madrid 28040, Spain;2. Department of Mechanical and Aerospace Engineering, Naval Postgraduate School, Monterey, CA 93943-5146, USA;1. Shahid Rajaee Teacher Training University, Faculty of Mechanical Engineering, Lavizan, Tehran, Iran;2. University of Iowa, Department of Mechanical and Industrial Engineering, Iowa City, IA, USA;1. Faculty of Physical Chemistry, Department of General and Physical Chemistry, University of Belgrade, Studentski trg 12-16, P. O. Box 137, 11001 Belgrade, Serbia;2. Institute of Nuclear Sciences “Vinča”, Laboratory for Radiation Chemistry and Physics, University of Belgrade, Mike Petrovića Alasa 12-14, P.O. Box 522, 11001 Belgrade, Serbia;3. Institute of Nuclear Sciences “Vinča”, Radiation and Environmental Protection Department, University of Belgrade, Mike Petrovića Alasa 12-14, P.O. Box522, 11001 Belgrade, Serbia |
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| Abstract: | Steady state and transient creep experiments have been conducted on a metal matrix composite consisting of an aluminum-5 wt% magnesium alloy matrix reinforced with 26 vol.% alumina fibers. The composite exhibits high steady state stress exponents which range from 12.2 at 200°C to 15.5 at 400°C. The apparent activation energy for creep over this temperature range is found to be 225 kJ/mol. After unloading, large anelastic strains are observed. The anelastic recovery process is found to vary non-linearly with stress and temperature and exhibits an activation energy of 151 kJ/mol. A finite element model of the composite microstructure has been developed by treating the alumina fibers as an interconnected network of elastic beam elements. This model accurately simulates the transient response of the material to changes in loading. The model suggests that the high stress exponents, high activation energy, and large recoverable strains observed for this material can be explained by a balance between load transfer to and damage of the fiber network. |
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