Publication

Creep of aluminium-magnesium open cell foam

Andreas Mortensen, Frédéric Diologent
2009
Journal Articles

Abstract

Aluminium-5 wt.% magnesium open cell foam produced by replication and tested in tension at 300, 350 or 450 degrees C creeps at rates between 10(-3) and 10(-8) s(-1). The behaviour of the foam matches that of the alloy from which it is made: three-power law creep with the same activation energy as for Al-Mg alloy creeping by viscous dislocation glide in the high stress regime and five-power law creep in the low stress regime. The model of Mueller et al. [Mueller R, Soubielle S, Goodall R, Diologent F. Mortensen A. Scripta Mater 2007;57:33], itself a simplified adaptation of previous variational estimates, predicts well the measured foam creep rates, in terms of both absolute value and dependence on temperature and applied stress. Agreement with the model of Andrews et al. [Andrews EW, Gibson LJ, Ashby MF. Acta Mater 1999;47:2853] is somewhat inferior, but nonetheless satisfactory. A strong dependence of creep rate on relative density is found; this feature is also captured by the variational estimate. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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Andreas Mortensen, Frédéric Diologent
2009
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6b397eac-15d5-4e3e-93a7-ab0ce8f5b9d4

About this result

Related concepts (15)

Creep (deformation)

In materials science, creep (sometimes called cold flow) is the tendency of a solid material to undergo slow deformation while subject to persistent mechanical stresses. It can occur as a result of long-term exposure to high levels of stress that are still below the yield strength of the material. Creep is more severe in materials that are subjected to heat for long periods and generally increase as they near their melting point. The rate of deformation is a function of the material's properties, exposure time, exposure temperature and the applied structural load.

Aluminium alloy

An aluminium alloy (or aluminum alloy; see spelling differences) is an alloy in which aluminium (Al) is the predominant metal. The typical alloying elements are copper, magnesium, manganese, silicon, tin, nickel and zinc. There are two principal classifications, namely casting alloys and wrought alloys, both of which are further subdivided into the categories heat-treatable and non-heat-treatable. About 85% of aluminium is used for wrought products, for example rolled plate, foils and extrusions.

Alloy

An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductility, opacity, and luster, but may have properties that differ from those of the pure metals, such as increased strength or hardness. In some cases, an alloy may reduce the overall cost of the material while preserving important properties.

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