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Suitability of various complex hydrides for foaming aluminum alloys

Published online by Cambridge University Press:  10 May 2013

Paul H. Kamm
Affiliation:
Structure and Properties of Materials, Technical University Berlin, 10623 Berlin, Germany
Francisco García-Moreno*
Affiliation:
Structure and Properties of Materials, Technical University Berlin, 10623 Berlin, Germany; and Institute of Applied Materials, Helmholtz Centre Berlin, 14109 Berlin, Germany
Catalina Jiménez
Affiliation:
Structure and Properties of Materials, Technical University Berlin, 10623 Berlin, Germany; and Institute of Applied Materials, Helmholtz Centre Berlin, 14109 Berlin, Germany
John Banhart
Affiliation:
Structure and Properties of Materials, Technical University Berlin, 10623 Berlin, Germany; and Institute of Applied Materials, Helmholtz Centre Berlin, 14109 Berlin, Germany
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Some hydrides that could replace TiH2 as the hitherto most suitable blowing agent for foaming aluminum alloys were investigated. Hydrides taken from the group MBH4 (M = Li, Na, K) and LiAlH4 were selected since these have not been studied in the past although their decomposition characteristics appear to be suitable. Foamable precursors of alloy AlSi8Mg4 were manufactured by pressing blends of metal and blowing agent powders. Powders, precursors and precursor filings were studied by mass spectrometry to obtain the hydrogen desorption profile. Foaming experiments were conducted with simultaneous x-ray radiographic monitoring. Two Li-containing blowing agents were found to perform well and can be considered alternatives to TiH2.

Type
Invited Feature Paper
Copyright
Copyright © Materials Research Society 2013 

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