Doty, Herbert, Samuel, Ehab, Samuel, Agnes M., Elsharkawi, Ehab, Songmene, Victor et Samuel, Fawzy H..
2025.
« Effect of Fe concentration and superheating on the microstructure and tensile properties of high Mg 413.0-Type Alloys: Role of Sr, Be, P, and La ».
Materials, vol. 18, nº 2.
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Résumé
The present work was undertaken to explore the multiple alloys and process steps that have been suggested to mitigate the harmful effects of high iron content in cast Al-Si alloys. The base alloy used was ommercial 413.0 alloy containing 0.35%Mg. Iron was added at three Fe levels up to 1.8%. The addition of Sr, 1.0%Zn, 0.2%Ti were made to the alloys so prepared, which were melted and maintained at a superheat of 750 ◦C or 950 ◦C. The melts were poured in different molds that produced three solidification rates. In total, 40 castings were prepared: half of the castings were used for metallographic examinations in the as-cast condition, while the other half were set aside for tensile testing following T6 treatment. The results show that at a solidification rate of 50 ◦C/s, 1.8%Fe could be dissolved in the aluminum matrix regardless of other melt treatments. With regard to the other solidification rates, superheating at 950 ◦C, coupled with Sr addition or Sr + Be, reduces the average β-platelets length by 80% (0.8 ◦C/s) or 95% (8 ◦C/s). The addition of P causes a marked drop in the alloy tensile strength due to the precipitation of primary Si, Al2Si2Sr, and β-AlFeSi hard-phase particles. Therefore, reducing the iron content in the castings may be considered a major objective to be recommended for developing alloys with higher strength and optimum quality values. More than 1000 tensile bars were tested in this study.
| Type de document: | Article publié dans une revue, révisé par les pairs |
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| Professeur: | Professeur Songmene, Victor |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 13 févr. 2025 16:41 |
| Dernière modification: | 04 mars 2025 14:47 |
| URI: | https://espace2.etsmtl.ca/id/eprint/30559 |
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