Effect of additives on the microstructure and tensile properties of Al–Si alloys

Abdelaziz, M. H.; Samuel, A. M.; Doty, H. W.; Valtierra, S.; Samuel, F. H.

doi:10.1016/j.jmrt.2019.03.003

Cited by 51 publications

(24 citation statements)

References 8 publications

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“…It is seen that the grey phase in Figure 1d was eutectic Si particles, while the white phase was a FeMnNi-containing intermetallic compound. Such intermetallic compounds were also reported in other Al-Si cast alloys by Manasijević et al [57] and Abdelaziz et al [58]. As shown in Figure 2a, in comparison with the matrix (or base) alloy, a large number of α-Si 3 N 4 peaks were present, indicating that the current squeeze casting at a fairly high pouring temperature of 800 • C did not change the crystal structure of the α-Si 3 N 4 whiskers added.…”

Section: Resultssupporting

confidence: 82%

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

et al. 2020

Metals

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Aluminum composites reinforced with ceramic whiskers exhibited a unique combination of high specific strength and superior specific modulus. A 20 vol.% Si3N4w/Al-11.5Si-1.0Mg-0.5Cu-0.5Ni (wt.%) composite was fabricated via squeeze casting in the present study. It was observed that the addition of silicon nitride (Si3N4) whiskers in the Al-Si cast alloy promoted extensive twinning in the eutectic silicon particles due to a coupled role of thermal stresses between the matrix and silicon and residual stresses present in the composite. Double aging peaks were present in the age-hardening curves. The precipitation mechanism involved the formation of Mg2Si and Al2CuMg phases. The presence of Si3N4 whiskers in the composite retarded the nucleation process of Mg2Si precipitate while enhancing its growth rate.

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Section: Resultssupporting

confidence: 82%

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

et al. 2020

Metals

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“…The influence of accompanying and alloying elements on the properties of AlSi8Cu2Fe alloy castings is relatively well documented [7][8][9][10][11][12][13][14], as well as the possibilities of its heat treatment [15][16][17][18].…”

Section: Fig 1 Turbulence and Dross Formation In The Melt At The Outmentioning

confidence: 99%

The influence of thermal history on the microstructure and mechanical properties of AlSi8Cu2Fe alloy

Šerák¹,

Vojtěch²,

Šimon³

2020

Manufacturing Technology

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In this work the influence of cyclic thermal history on the microstructure and mechanical properties of AlSi8Cu2Fe alloy was studied. The commercial aluminum alloy was subjected to a special heat treatment during which the alloy repeatedly changed from a liquid to a semi-solid state. During this process, samples were taken, and the castings were subjected to another study. Gradual changes in the microstructure, chemical composition of the alloy, hardness and mechanical properties under pressure at normal temperatures have been documented. The content of alloying elements, especially magnesium, decreased significantly, the proportion of casting defects increased, especially hydrogen bubbles, microshrinkage and oxide inclusions in the alloy, with the increasing number of cycles. These changes also led to a decrease in the mechanical properties of the alloy. A series of samples without cyclic heat loading was also prepared for comparison.

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“…Besides their superior properties such as easy castability, low weight/ strength ratio, high heat and electrical conductivity, their economic importance increases their importance in manufacturing day by day [1][2][3][4][5][6][7]. Al-Si alloys are increasingly used in the aerospace industry, satellite bearings and inertial navigation systems [8], and in automotive applications to improve fuel economy by reducing vehicle weight [9]. Eutectic Al-Si alloys are preferred in the manufacture of pistons and other critical components due to their excellent castability and wear resistance [10].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, both the mechanical properties of the material can be improved and the production cost can be reduced [19]. However, the addition of high amounts of copper (4-6% Cu) reduces the hot tear resistance and castability of the alloy [9]. In order to achieve high efficiency in machining theory, it is necessary to produce high-quality machine parts and to know the mechanical properties of the material well.…”

Section: Introductionmentioning

confidence: 99%

Machinability properties of Al–7Si, Al–7Si–4Zn and Al–7Si–4Zn–3Cu alloys

Bayraktar

Afyon

2020

J Braz. Soc. Mech. Sci. Eng.

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Al-7Si, Al-7Si-4Zn, Al-7Si-4Zn-3Cu alloys were produced by permanent mold casting method to investigate the effects of copper and zinc additions on the machinability properties of Al-7Si alloy. The structural and mechanical properties of the produced alloys were investigated with conventional methods. Machinability properties of these alloys were determined by turning, and they were associated with structural and mechanical properties of the alloys. Machinability experiments were carried out in CNC vertical machining center under dry cutting conditions using uncoated carbide drill and constant cutting speed (120 m/min), feed (0.15 mm/rev) and depth of cut (15 mm) values. The microstructure of Al-7Si binary alloy was observed to be composed of aluminum-rich α phase, primary silicon crystals and eutectic Al-Si phase. The addition of 4% Zn to the Al-7Si alloy did not form a different phase in the microstructure. However, Al 2 Cu intermetallic phase was formed by addition of 3% Cu. While the hardness and tensile strength of the alloy increased, elongation to fracture significantly reduced. As a result of machinability experiments, it was observed that the minimum thrust force and surface roughness occurred in Al-7Si-4Zn-3Cu alloy, while the maximum built-up edge was observed during drilling of Al-7Si and Al-7Si-4Zn alloys. Microhardness value of machined surface in Al-7Si alloy was found to be the minimum while the maximum Al-7Si-4Zn-3Cu alloy was observed.

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Effect of additives on the microstructure and tensile properties of Al–Si alloys

Cited by 51 publications

References 8 publications

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

Silicon Nitride Whisker-Reinforced Aluminum Matrix Composites: Twinning and Precipitation Behavior

The influence of thermal history on the microstructure and mechanical properties of AlSi8Cu2Fe alloy

Machinability properties of Al–7Si, Al–7Si–4Zn and Al–7Si–4Zn–3Cu alloys

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