Effect of Intermetallics and Tramp Elements on Porosity Formation and Hardness of Al–Si–Mg and Al–Si–Cu–Mg Alloys

Mohamed, A.M.A.; Samuel, E. Isaac; Samuel, A. M.; Doty, H. W.; Songmené, Victor; Samuel, F. H.

doi:10.1007/s40962-022-00813-w

Cited by 7 publications

(2 citation statements)

References 22 publications

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“…These results are consistent with Figure 2c,d. Therefore, the phase composition of the Al-Si-Mg-Cu alloy system was closely related to the Cu content; meanwhile, the content of each phase was also determined by the Cu and Mg contents [6][7][8][9][10]. In A2 alloys, the XRD results do not show the diffraction peaks of Q and θ phases, but the microstructure in Figure 2b indicates the presence of Q and θ phases.…”

Section: As-cast Microstructuresmentioning

confidence: 98%

“…Al-Si cast aluminum alloys are extensively used in the automobile field due to their superior castability, satisfactory mechanical and physical properties, and low coefficient of thermal expansion [1][2][3][4]. Adding Mg to Al-Si alloys plays a role in solid solution strengthening and precipitation hardening of aging treatment [5][6][7]. Cu can significantly increase the mechanical properties of Al-Si-Mg alloys with the formation of nanoscale θ and Q precipitates during aging [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Evolution and Mechanical Properties of Al-Si-Mg-Cu Cast Alloys with Different Cu Contents

Zhou

Wang

Nagaumi

et al. 2023

Metals

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The mechanical properties of Al-Si-Mg-Cu cast alloys are heavily determined by Cu content due to the precipitation of relating strengthening precipitates during the aging treatment. In this study, the microstructures and mechanical properties of Al-9Si-0.5Mg-xCu (x = 0, 0.9, 1.5, and 2.1 wt.%) alloys were investigated to elucidate the effect of Cu content on the evolution of their mechanical properties. After T6 (480 °C + 6 h − 530 °C + 4 h, 175 °C + 10 h) treatment, Mg-rich and Cu-rich phases were dissolved in the matrix; the main aging-precipitates of the alloys change from the needle-like β″ phases in the base alloy to the granular Q′ phases in the 0.9Cu alloy, the granular Q′ phase in the 1.5Cu alloy, the granular Q′ phase, and θ′ platelets in the 2.1Cu alloy. The increase of Cu level results in difference of the type, number density, and morphology of the nanoscale precipitated phase. Because of precipitation strength, the yield strength was increased by 103–130 MPa depending on the Cu contents. The precipitation strengthening effect of the precipitates was quantitatively evaluated by the Orowan mechanism. The aging-treated Al-9Si-0.5Mg-2Cu alloy shows the good strength and ductility: yield strength 351 MPa, ultimate tensile strength 442 MPa, and elongation 8.4%. The morphologies of fracture surfaces of the alloys also were observed.

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