Mechanical properties of squeeze-cast Al–7Si–0.3Mg alloys with Sc-modified Fe-rich intermetallic compounds
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Author list: Chanyathunyaroj K., Patakham U., Kou S., Limmaneevichitr C.
Publisher: University of Science and Technology Beijing
Publication year: 2018
Volume number: 37
Issue number: 9
Start page: 769
End page: 777
Number of pages: 9
ISSN: 1001-0521
eISSN: 1001-0521
Languages: English-Great Britain (EN-GB)
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Abstract
Iron (Fe) has a low solid solubility in aluminum (Al), and it usually forms Fe-rich intermetallic compounds. Scandium (Sc) is an element that can act as a grain refiner, modify the eutectic silicon and change the morphology of Fe-rich intermetallic compounds at the same time. The present work was conducted to study the effect of Sc on the mechanical properties of Al–7Si–0.3Mg. The alloy was prepared by squeeze casting at two levels of Fe (0.2 and 0.4 wt%) and three levels of Sc (0 wt%, 0.2 wt% and 0.4 wt%). Sc is found to increase the mechanical properties of the alloy, including its hardness, yield strength and ultimate tensile strength. At 0.2 wt% Fe, adding Sc increases the strength while maintaining good elongation. At 0.4 wt% Fe, adding Sc increases the strength but decreases the elongation slightly. The distributions and morphologies of intermetallic compounds and eutectic silicon affect the elongation. Both Fe-rich intermetallic compounds and Sc-rich intermetallic compounds act as crack initiation sites. The 0.2 wt% Fe + 0.2 wt% Sc alloy has the lowest amount of these intermetallic compounds, and eutectic silicon is small and fibrous. So, it has the highest elongation. © 2017, The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany.
Keywords
Al–Si–Mg alloy
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