The Reason of Formation of Gas Porosity in Composite Castings with an Aluminum Alloy Matrix
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.
The copyrights for articles in this journal are retained by the author(s), with first publication rights granted to the journal. By virtue of their appearance in this open-access journal, articles are free to use with proper attribution in educational and other non-commercial settings.