Microstructure and mechanical properties of Al–Si–Mg–Cu–Ti alloy with trace amounts of scandium

Li, Yukun; Du, Xiaodong; Fu, Junwei; Zhang, Ya; Zhang, Zhen; Wu, Yucheng

doi:10.1080/02670836.2018.1444924

Cited by 4 publications

(4 citation statements)

References 26 publications

(44 reference statements)

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“…Similar precipitates have been reported in a previous study, where 0.23-nm-wide Mg 2 Si precipitates formed and had a different direction compared with that of other precipitates, e.g. Al 3 (Sc, Ti) [18]. In addition, a large number of the precipitates, including θ (Al 2 Cu) phase, are observed around β metastable phase in the Ag-0.3%CNT sample.…”

Section: Microstructural Characteristicssupporting

confidence: 87%

Effect of carbon nanotubes on the mechanical properties of cast Al–Si–Cu alloys

Okayasu

Hasanah

2022

Materials Science and Technology

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To enhance the mechanical properties of cast Al–Si–Cu alloys (ADC12), 0.3% of carbon nanotubes (CNTs) was added. The cast ADC12–0.3%CNT samples were synthesised via heated mould continuous casting for the creation of fine grains, and the artificial aging process was conducted at 173°C for 13 h to obtain precipitation hardening. The reinforcement and refinement of eutectic Si and precipitates (Al2Cu and Mg2Si) were achieved by adding CNTs, which leads to a high tensile strength of about 450 MPa and a relatively high ductility of about 10%. The obtained tensile strength and 0.2% proof stress are more than twice as high as those of the conventional cast ADC12 alloy. The refinement of the microstructures could be due to the interruption of their growth caused by the CNTs.

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Section: Microstructural Characteristicssupporting

confidence: 87%

Effect of carbon nanotubes on the mechanical properties of cast Al–Si–Cu alloys

Okayasu

Hasanah

2022

Materials Science and Technology

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“…Different grits of 320 to 2000 emery sheets were applied to the samples to get a smooth and finished surface. They were subjected to age hardening at 200 °C for 4 hours to obtain peak strength [5,9]. A muffle furnace was used for all kinds of heat treatment processes of the alloys.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…To enhance the mechanical properties, minor alloying elements like Cu, Mg, Ni, Zn, and Mn are added to these alloys [2][3][4]. Also, the trace addition of Zr, Ti, Sc, and Ce in the alloy is considered a grain refiner [5,6]. In addition, impurities such as Fe, Pb, and Sn are automatically added to the alloy by casting [7].…”

Section: Introductionmentioning

confidence: 99%

Impact of Deep Seawater on the Electrochemical Corrosion Performance of Hypoeutectic, Eutectic and Hypereutectic Al-Si Automotive Alloys

Khan,

Hossain,

Kaiser

2023

Int. J. Automot. Mech. Eng.

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Corrosion of aluminum alloys is a significant concern for shipbuilders to ensure the longevity of ocean vessels and equipment. Hence, the study aims to evaluate the corrosion performance of Al-Si as automotive alloys with varying concentrations of Si in deep seawater using electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The surface condition prior to corrosion, as well as after corrosion, is analyzed using optical and scanning electron microscopy. The entire test is performed at an ambient condition. The results demonstrate that the corrosion resistance improves in alloys with increasing amounts of Si near the eutectic level, after which the corrosion protection deteriorates. Higher Si concentrations show higher values for polarization resistance and open circuit potential. In contrast, corrosion current and corrosion rate values decrease with increasing Si concentration up to eutectic composition. Si assists the formation of SiO2 and MgO films through Mg2Si intermetallics along with the Al2O3 on the surfaces, which aids in corrosion resistance. Optical and scanning electron micrographs reveal the presence of films on the surfaces after corrosion, which exhibit pits and pinholes on the surfaces of the alloys with lower Si concentrations. Hypereutectic alloy is affected by corrosion of its pinhole-like defects. The corresponding EDS analysis also confirms the protective layer of different oxides on the surfaces.

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“…Adding alloying elements such as boron, titanium, phosphorus, sodium, and strontium are the main way to obtain suitable microstructure, but its effect is limited [5][6][7][8][9]. In previous research, a lot of rare earth elements have been used as micro-alloy elements, and the addition of intermediate alloy has improved the integrated performance of aluminum-silicon alloys by means of grain refinement, eutectic silicon modification, and the precipitates as nucleation sites of heterogeneous phase [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of erbium on microstructure and mechanical properties of Al‐Si‐Mg‐Cu alloy

Lei

Zhang

Dong

et al. 2020

Materialwissenschaft Werkst

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The effect of erbium addition at different ratios (0.2 wt.%, 0.4 wt.%, 0.6 wt.%) on microstructure evolution and mechanical properties of the AlÀ Si-MgÀ Cu alloy have been investigated. The results show that adding erbium can refine the primary αaluminum grains in the as-cast alloys to a diverse extent. In addition, the coarse and long plate-like eutectic silicon can be modified into a fine short rod-like structure, and the distribution of eutectic silicon can be optimized. During the solidification of the alloy, erbium and other elements will form primary erbium-rich precipitates of different sizes and shapes, including primary erbium-silicon-rich and erbium-copper-silicon-rich precipitates, which can change the distribution of solute atoms and promote the evolution of microstructure. But the coarse primary precipitates will embrittle the alloys and consume more solute atoms (erbium, copper, magnesium), having a certain inhibitory effect. After heat treatment, the solid solution decomposes to form secondary Al 3 Er precipitates, which further strengthens the alloy. In particular, the alloy with the highest erbium content shows the best comprehensive tensile properties at as-cast and heat-treatment conditions.

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Microstructure and mechanical properties of Al–Si–Mg–Cu–Ti alloy with trace amounts of scandium

Cited by 4 publications

References 26 publications

Effect of carbon nanotubes on the mechanical properties of cast Al–Si–Cu alloys

Effect of carbon nanotubes on the mechanical properties of cast Al–Si–Cu alloys

Impact of Deep Seawater on the Electrochemical Corrosion Performance of Hypoeutectic, Eutectic and Hypereutectic Al-Si Automotive Alloys

Effect of erbium on microstructure and mechanical properties of Al‐Si‐Mg‐Cu alloy

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