The Reason of Formation of Gas Porosity in Composite Castings with an Aluminum Alloy Matrix

Authors

  • Michal SZWEYCER∗, Jacek JACKOWSKI Institute of Materials Technology, Poznań University of Technology

Keywords:

composites, porosity.

Abstract

The paper presents the types of gaseous porosity occurring in composite castings in result of occlusion of atmospheric
air during saturating of the composite reinforcement and liberation of gases while cooling and solidifying of matrix
metal of the composite. A mechanism of gas occlusions formation is presented, as well as the factors causing the
changes in their volume under the conditions of varying pressure in characteristic locations of the composite casting in
the course of its production are discussed. The results of the analysis of gas liberation from the composite matrix,
nucleation, and growth of the blowholes are provided. Conclusions resulting from the theoretical consideration are
illustrated by the examples of porosity forms found by the authors in experimental composite castings.

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Published

2007-03-15

Issue

Vol. 13 No. 1 (2007)

Section

METALS, ALLOYS, COATINGS

License

 

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