Influence of bifilm defects generated during mould filling on the tensile properties of Al−Si−Mg cast alloys

Journal article

El-Sayed, M., Essa, K. and Hassanin, H. 2022. Influence of bifilm defects generated during mould filling on the tensile properties of Al−Si−Mg cast alloys. Metals. 12 (1), p. e160. https://doi.org/10.3390/met12010160
AuthorsEl-Sayed, M., Essa, K. and Hassanin, H.
AbstractEntrapped double oxide film defects are known to be the most detrimental defects during the casting of aluminium alloys. In addition, hydrogen dissolved in the aluminium melt was suggested to pass into the defects to expand them and cause hydrogen porosity. In this work, the effect of two important casting parameters (the filtration and hydrogen content) on the properties of Al−7 Si−0.3 Mg alloy castings was studied using a full factorial design of experiments approach. Casting properties such as the Weibull modulus and position parameter of the elongation and the tensile strength were considered as response parameters. The results suggested that adopting 10 PPI filters in the gating system resulted in a considerable boost of the Weibull moduli of the tensile strength and elongation due to the enhanced mould filling conditions that minimised the possibility of oxide film entrainment. In addition, the results showed that reducing the hydrogen content in the castings samples from 0.257 to 0.132 cm3/100 g Al was associated with a noticeable decrease in the size of bifilm defects with a corresponding improvement in the mechanical properties. Such significant effect of the process parameters studied on the casting properties suggests that the more careful and quiescent mould filling practice and the lower the hydrogen level of the casting, the higher the quality and reliability of the castings produced.
KeywordsBifilm; Al–7 Si–0.3 Mg alloy; Hydrogen; Filtration; Weibull modulus
Year2022
JournalMetals
Journal citation12 (1), p. e160
PublisherMDPI
ISSN2075-4701
Digital Object Identifier (DOI)https://doi.org/10.3390/met12010160
Official URLhttps://www.mdpi.com/2075-4701/12/1/160
Publication dates
Online16 Jan 2022
Publication process dates
Deposited10 Jan 2022
Accepted05 Jan 2022
Publisher's version
Output statusPublished
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