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New Strategy to Improve the Mechanical Properties in Cast Al–Mg–Fe Alloys by the Formation of Al–AlFe Eutectic
Author(s) -
Zhou Pengfei,
Wang Dongtao,
Liu Shichao,
Wang Rui,
Zhang Haitao,
Li Xinzhong,
Nagaumi Hiromi
Publication year - 2021
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.202001460
Subject(s) - materials science , eutectic system , intermetallic , alloy , ultimate tensile strength , metallurgy , ductility (earth science) , aluminium , elongation , creep
Fe‐containing intermetallics are often detrimental to the mechanical properties in aluminum alloy. However, an Al–Fe alloy system can form an Al + AlFe eutectic structure in a narrow freezing range, providing the fine Al 13 Fe 4 or Al 6 Fe intermetallics. Herein, the ternary Al–Mg–Fe alloy is selected to achieve the Al + AlFe eutectic structure composition and form fine AlFe intermetallics for improving the strength and ductility of Al–Mg cast alloy. The results show that as the composition of Al–Mg–Fe alloy is closer to the Al + AlFe eutectic composition, the amount of coarse Al 13 Fe 4 intermetallics decreases, whereas the amount of fine Al + Al 13 Fe 4 eutectic increases. The microstructural evolution results in the improvement of yield strength (72.8–92.4 MPa), tensile strength (126.1–213.7 MPa), and the elongation (2.5–6.2%). This work provides a new strategy to improve the mechanical properties in Al–Mg cast alloy.