High-temperature deformation of 6061 Al |
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| Affiliation: | 1. College of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China;2. Guobiao (Beijing) Testing & Certification Co., Ltd., Beijing 101407, China;3. Beijing University of Technology, Beijing 100124, China;4. Beijing Key Lab of Special Elastomeric Composite Materials, Beijing 102617, China;5. Shanghai International Studies University, Shanghai 201620, China;1. Department of Materials Engineering, São Carlos School of Engineering, University of São Paulo, João Dagnone Avenue, 1100, Jardim Santa Angelina, São Carlos, SP, 13563-120, Brazil;2. George S. Ansell Department of Metallurgical and Materials Engineering, Colorado School of Mines, 1500 Illinois St., Golden, CO, 80401, USA;3. Chemistry Institute of Araraquara, Paulista State University Júlio de Mesquita Filho, Francisco Degni St., 55, Quitandinha, Araraquara, SP, 14800-900, Brazil |
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| Abstract: | The creep behavior of powder metallurgy (PM) 6061 Al, which has been used as a metal matrix alloy in the development of discontinuous silicon carbide reinforced aluminum (SiCAl) composites, has been studied over six orders of magnitude of strain rate. The experimental data show that the steady-state stage of the creep curve is of short duration; that the stress dependence of creep rate is high and variable; and that the temperature dependence of creep rate is much higher than that for self-diffusion in aluminum. The above creep characteristics are different from those documented for aluminum based solid-solution alloys but are similar to those reported for discontinuous SiCAl composites and dispersion-strengthened (DS) alloys. Analysis of the experimental data shows that while the high stress dependence of creep rate in 6061 Al, like that in DS alloys, can be explained in terms of a threshold stress for creep, the strong temperature dependence of creep rate in the alloy is incompatible with the predictions of available threshold stress models and theoretical treatments proposed for DS alloys. |
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