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Role of Temperature and SiCP Parameters in Stability and Quality of Al-Si-Mg/SiC Foams

Metal and Polymer Matrix Composites
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Abstract

Composites of Al-Si-Mg (A356) alloy with silicon carbide particles were synthesized in-house and foamed by melt processing using titanium hydride as foaming agent. The effects of the SiCP size and content, and foaming temperature on the stability and quality of the foam were explored. It was observed that the foam stability depended on the foaming temperature alone but not on the particle size or volume percent within the studied ranges. Specifically, foam stability was poor at 670°C. Among the stable foams obtained at 640°C, cell soundness (absence of/low defects, and collapse) was seen to vary depending on the particle size and content; For example, for finer size, lower particle contents were sufficient to obtain sound cell structure. It is possible to determine a foaming process window based on material and process parameters for good expansion, foam stability, and cell structure.

Notes

Acknowledgements

The authors sincerely thank the Defense Research and Development Organization for financial assistance.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Defence Metallurgical Research LaboratoryHyderabadIndia
  2. 2.Department of Mechanical EngineeringIndian Institute of Technology BombayPowai, MumbaiIndia

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