What Is the Main Cause of Shrinkage Porosity in AlSi7Mg0.6 Alloy Castings Obtained with an Increased Share of Secondary Materials?
Jaroslaw Piatkowski, Katarzyna Nowinska, Tomasz Matula, Andrzej Nowrot
TL;DR
This study investigates the main cause of shrinkage porosity in AlSi7Mg0.6 alloy castings when using more recycled materials.
Contribution
The study clarifies the primary cause of shrinkage porosity in AlSi7Mg0.6 alloy castings by comparing two competing theories.
Findings
Plate-like β-Al5FeSi phases are the main cause of shrinkage porosity in gravity castings with over 0.7 wt.% Fe.
In pressure castings, double-layer oxide films are likely the main cause of shrinkage porosity.
The Mg2Si phase does not contribute to shrinkage porosity in any casting method.
Abstract
Determining the causes of shrinkage porosity in Al-Si-Mg alloy castings with an increased proportion of secondary materials is very important and poses many problems. The reason for this is the existence of two opposing theories. One assumes that plate-like α-Al5FeSi (β-Fe) phase segregations cause shrinkage porosity. At the same time, the other believes that thin, double-layered oxide films with air-filled voids are responsible for the porosity. To address this question, the popular commercial alloy AlSi7Mg0.6 (EN AC-42200) was selected for testing. This alloy was cast into three series: with increasing content from 0.3 to 0.8 wt.% Fe and a constant content of approx. 0.1 wt.% Mn, the second with increasing iron and manganese contents (Mn/Fe = 1/2) (both series cast by gravity), and the third series under low pressure (approx. 0.15 MPa) with increasing content from 0.8 wt.% to 1.3 wt.%…
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Taxonomy
TopicsAluminum Alloy Microstructure Properties · Solidification and crystal growth phenomena · Aluminum Alloys Composites Properties