Doty, H. W., Samuel, E., Samuel, A. M., Elsharkawi, E., Songmene, V. et Samuel, F. H..
2025.
« Effect of mischmetal concentration and superheating on the microstructure and tensile properties A319.1: Role of Fe content ».
Journal of Materials Research and Technology, vol. 35.
pp. 51-66.
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Résumé
The aim of this research is to study the effect of certain metallurgical parameters such as the addition of a mixture of rare earths (mischmetal) and superheating on the microstructure and tensile properties of the Al–Si–Cu alloy A319.2 containing 0.4%, 0.8% and 1.2% iron used in the automotive industry. The mischmetal (MM) precipitates in the form of platelets like the β-Al5FeSi leading to a marked refinement in eutectic Si particles at 5% MM. In addition, α- Al15(Fe,Mn)3Si2. segregated particles and mischmetal-bound intermetallics persist in the microstructure even after T6 heat treatment. The tensile properties of 0.8% iron alloys deteriorate when the mischmetal concentration and superheat temperature increase, although the silicon phase undergoes significant changes. Alloys with a high iron concentration (1.2% Fe) showed a slight decrease in the length of the β-Al5FeSi phase platelets and of the mischmetal compared to alloys with 0.4% and 0.8% Fe when the concentration of mischmetal increases to 5% and when the superheating temperature reaches 950 ◦C. This observation explains the increase in the % elongation to fracture of the 1.2% Fe-5% mischmetal alloy cast directly from 750 ◦C or after superheating at 950 ◦C, followed by in-furnace cooling to 750 ◦C. The ultimate tensile strength and yield strength degrade with mischmetal, but improve slightly with superheating; only for the 1.2% Fe-0% mischmetal alloy, its yield strength decreases once superheated to 950 ◦C.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Professeur: | Professeur Songmene, Victor |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 27 janv. 2025 19:21 |
| Dernière modification: | 30 janv. 2025 14:21 |
| URI: | https://espace2.etsmtl.ca/id/eprint/30482 |
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