Abstract
Metal foams creep when loaded mechanically at high homologous temperatures. We have studied the creep behavior of closed-cell aluminum-based foams with relative densities of 0.092, 0.112, and 0.163. Compressive creep tests were performed at 300 °C at strain rates ranging from 10−9 to 10−4 s−1. Special efforts were made to produce and characterize a bulk reference material exhibiting the same chemical composition. Results show that the foams exhibit a lower creep strength and a higher stress exponent than predicted by the Gibson-Ashby model for regular foams. The possible mechanisms responsible for this deviation are discussed. A semi-empirical rate equation is established which describes the experimental data well.
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Haag, M., Wanner, A., Clemens, H. et al. Creep of aluminum-based closed-cell foams. Metall Mater Trans A 34, 2809–2817 (2003). https://doi.org/10.1007/s11661-003-0182-1
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DOI: https://doi.org/10.1007/s11661-003-0182-1