Role of SiCP on Processing and Physical Characteristics of Al-Si-Mg/SiCP Composite Foams

N.V.  Ravi Kumar; Hina Gokhale; Amol A. Gokhale

doi:10.4028/www.scientific.net/MSF.710.383

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HomeMaterials Science ForumMaterials Science Forum Vol. 710Role of SiCP on Processing and Physical...

Role of SiC_P on Processing and Physical Characteristics of Al-Si-Mg/SiC_P Composite Foams

Abstract:

Metallic foams find specialised applications in industry due to their unique properties such as ultra light weight and high impact energy absorption. When ceramic particles (e.g. SiC, Al₂O₃) are present, metal matrix composite (MMC) foams can be fabricated. Further it is known theoretically that foam strength is proportional to strength of foam material, and also it has been established that metal matrix composites exhibit better strength vis-à-vis their matrix metal. Accordingly, the present work is undertaken to study the processing of composite foams. Al-Si-Mg/SiC_P foams were successfully prepared via liquid metallurgy processing using TiH₂. The role of particle size, volume fraction (5 to 20 vol. %), and temperature (640 and 670°C) on foaming tendency were explored using the design of experiments approach. Liquid foams with reasonably good expansions could be achieved for all the combinations of particle size, volume %, and foaming temperature. Temperature has a dominant effect on foam collapse (decay) during solidification, irrespective of the particle size and vol. %. For foams processed at 640°C, the cell size variation is marginal along the foam height, except at the top portion which has finer cells. The evolution of foam, and the role of SiC on foam stability are discussed based on macro and microstructural results.

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Periodical:

Materials Science Forum (Volume 710)

Pages:

383-388

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.710.383

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Online since:

January 2012

Authors:

N.V. Ravi Kumar, Hina Gokhale, Amol A. Gokhale

Keywords:

Al-Si/SiC_P Composite, Closed Cell Foam, Liquid Metal Processing

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