The authors acknowledge the financial support of the DFG, grant no. KO 1984/5-1.
Aluminum Integral Foams with Near-Microcellular Structure†
Article first published online: 20 JUN 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Special Issue: Cellular Materials
Volume 13, Issue 11, pages 1050–1055, November 2011
How to Cite
Hartmann, J., Trepper, A. and Körner, C. (2011), Aluminum Integral Foams with Near-Microcellular Structure. Adv. Eng. Mater., 13: 1050–1055. doi: 10.1002/adem.201100035
- Issue published online: 28 OCT 2011
- Article first published online: 20 JUN 2011
- Manuscript Revised: 21 APR 2011
- Manuscript Received: 28 JAN 2011
- DFG. Grant Number: KO 1984/5-1
In the present work the influence of the amount and size distribution of blowing agent particles (magnesium hydride, MgH2) on the resulting pore structure of aluminum foams is studied. A modified die casting process called integral foam moulding (IFM) is used where aluminum melt mixed with blowing agent is injected into a mould cavity. High cooling rates at the wall of the die result in the formation of a dense shell, whereas, the decomposition of the blowing agent in the inner region leads to a cellular core. Different particle size fractions of MgH2 are provided by sieving; the resulting pore structures of the foams are analyzed by microcomputed tomography. The results suggest that the pore size distribution represents a direct image of the size distribution of the used powder as well as of the particle density within the melt. This finding allows the production of homogeneous microcellular foams by using a high number of particles with a narrow size distribution.