The effect of Fe content on the microstructure and mechanical properties of Al-Mg-Si alloy cast rods at different solution temperatures was investigated by means of electronic tensile testing machine, metallographic microscope and transmission electron microscope. When Fe content is 0.14%(mass fraction, the same below), Al-Mg-Si alloy has the highest strength and elongation. With the increase of solution temperature, the strength of the alloy increases continuously. When the solution temperature is above 520 ℃, the strength of the alloy tends to peak, the tensile strength is 280 MPa, the yield strength is 259 MPa, and the elongation is 13.40%. For the Al-Mg-Si alloy with Fe content of 0.14%, the Fe-rich phase at the grain boundary is spherical α-Al8Fe2Si, which has a weak cleavage effect on the alloy matrix, and its dispersion distribution plays a role in the grain boundary binding. When Fe content is lower than 0.14%, the spherical α-Al8Fe2Si at grain boundaries is very little, and the nailed grain boundaries are weak. When the solution above 500 ℃, the grains grow obviously, the elongation after fracture is greatly reduced. When the Fe content is higher than 0.14%, the Fe-rich phases are mostly long strips of β-Al5FeSi, which have a strong effect on the interface cleavage. With the increase of Fe content, the strength and post-fracture elongation of the alloy decrease continuously. In addition, Fe content affects the precipitation transition during the aging process of βʺ phase. When Fe content is 0.14%, the size of βʺ phase precipitation is small, the number is large, and the distribution is dense, which has the strongest hindering effect on dislocation movement.
Effect of Fe content on microstructure and mechanical properties of Al-Mg-Si alloy
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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