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Structural Characterization of Aluminum Foams Obtained by Powder Metallurgy

Published online by Cambridge University Press:  01 February 2011

C. A. León-Patiño ,
M. A. Monje-García ,
E. A. Aguilar-Reyes  and
E. Bedolla-Becerril
C. A. León-Patiño
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888 Centro, C.P. 58000, Morelia, México, [email protected]
M. A. Monje-García
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888 Centro, C.P. 58000, Morelia, México, [email protected]
E. A. Aguilar-Reyes
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888 Centro, C.P. 58000, Morelia, México, [email protected]
E. Bedolla-Becerril
Affiliation:
Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo, A.P. 888 Centro, C.P. 58000, Morelia, México, [email protected]
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Abstract

The porous structure of aluminum foams was quantitatively monitored in terms of pore density, pore area, and shape and size distribution using image analysis; then, related to density and expansion profiles by interrupted experiments. This practice offers important information in the control and reproducibility of foams. The aluminum foams were produced by the powder compact melting method at 800°C. The foamable precursors consisted in uniaxial cold pressed Al-TiH2 mixtures compacted at 387 MPa; the pressure applied and particle size distribution of the mixture originated preforms with 95.9% densification. This procedure eliminated the traditional hot-compaction step; besides, the amount of foaming agent was kept to a minimum of 0.5 wt.% TiH2. A volume expansion of 215 to 236% and densities from 0.7730 to 0.8206 g/cm3were obtained in a time window of 420 to 570 s. The calculated shape factors and Feret diameters defined how the roundness of pores varies with size all along the foaming process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1242: Symposium 4 – Materials Characterization , 2009 , S4-P147
Copyright
Copyright © Materials Research Society 2010

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References

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