The effect of main alloying elements on the physical properties of Al–Si foundry alloys

Stadler, Florian; Antrekowitsch, Helmut; Fragner, Werner; Kaufmann, Helmut; Pinatel, Eugenio Riccardo; Uggowitzer, Peter J.

doi:10.1016/j.msea.2012.09.093

Cited by 104 publications

(47 citation statements)

References 21 publications

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“…Although the thermal conductivity of bulk Si was reported to be 145 Wm −1 K −1 [12], both the electron and phonon conduction were reported to be considerably diminished by the interfaces [25], particularly when the dispersive phase was placed in film stacks [26]. Stadler et al [12] used 25 Wm −1 K −1 instead to simulate the thermal conductivity of Si precipitates in Al-Si alloys.…”

Section: Discussionmentioning

confidence: 99%

“…Stadler et al [12] used 25 Wm −1 K −1 instead to simulate the thermal conductivity of Si precipitates in Al-Si alloys. In the current study, we set the thermal conductivity of the matrix (λ m ) to the measured thermal conductivity (i.e., 213.5 Wm −1 K −1 ) of 99.8 % Al and set that of the plateshaped Si precipitates (λ p ) to 25 Wm −1 K −1 [20,27].…”

Section: Discussionmentioning

confidence: 99%

“…Effective medium approximations describe the effective properties of multiphase systems according to the distribution and volume fraction of constituent phases. Helsing and Grimvall [11] used effective medium approximations to obtain a favorable correlation between the thermal conductivity and measured values of cast iron at 300 K. Stadler et al [12] also used this method to estimate the thermal conductivities of Al-Si foundry alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Although numerous studies have investigated the thermal conductivities of Al alloys [12][13][14], such studies have typically examined commercial alloys containing complex alloying elements with varying purity levels; furthermore, such examinations have been conducted using various processes. Multicomponent alloy systems typically contain a considerable amount of intermetallic compounds, and this may lead to difficulties in understanding the effects of alloying elements on the thermal conductivity of Al alloys.…”

Section: Introductionmentioning

confidence: 99%

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Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

et al. 2015

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This study investigated 30Al-Si, Al-Cu, AlFe, Al-Mg, Al-10Si-Cu, Al-10Si-Fe, and Al-10Si-Mg binary and ternary Al alloys, which are among the most commonly used commercial alloys. The thermal and electrical conductivity of the gravity castings of these alloys were measured. The results indicated that when 1 wt% Si, Cu, or Fe was mixed with commercial Al with 99.8 % purity, the thermal conductivity decreased from 213.5 Wm −1 K −1 to approximately 190-210 Wm −1 K −1 . The thermal conductivity remained at a nearly constant level of 154-157 Wm −1 K −1 when the Si concentration exceeded 6 wt% in the Al-Si alloys. Regarding the Al-Mg alloys, the thermal conductivity did not change when the concentration of Mg was increased to 1 wt%. When the concentration of Mg exceeded 1 wt%, the thermal conductivity decreased greatly from 212.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

et al. 2015

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“…Indeed, for the E-C coupling, the HV values confirmed the results of the tests conducted on the other two combinations and the E-C frame case studied. In particular, it was confirmed that the extruded component (Si~1%) better conducted the heat produced during welding, resulting in a reduced change in hardness [58][59][60]. Looking at the hardness profiles, considerations similar to E-E and E-C can be advanced for extrusion-welding and casting-welding interfaces, respectively.…”

Section: Bar Samplesmentioning

confidence: 99%

Study and Characterization of EN AW 6181/6082-T6 and EN AC 42100-T6 Aluminum Alloy Welding of Structural Applications: Metal Inert Gas (MIG), Cold Metal Transfer (CMT), and Fiber Laser-MIG Hybrid Comparison

Cornacchia

Cecchel

2020

Metals

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The present research investigates the effects of different welding techniques, namely traditional metal inert gas (MIG), cold metal transfer (CMT), and fiber laser-MIG hybrid, on the microstructural and mechanical properties of joints between extruded EN AW 6181/6082-T6 and cast EN AC 42100-T6 aluminum alloys. These types of weld are very interesting for junctions of Al-alloys parts in the transportation field to promote the lightweight of a large scale chassis. The weld joints were characterized through various metallurgical methods including optical microscopy and hardness measurements to assess their microstructure and to individuate the nature of the intermetallics, their morphology, and distribution. The results allowed for the evaluation of the discrepancies between the welding technologies (MIG, CMT, fiber laser) on different aluminum alloys that represent an exhaustive range of possible joints of a frame. For this reason, both simple bar samples and real junctions of a prototype frame of a sports car were studied and, compared where possible. The study demonstrated the higher quality of innovative CMT and fiber laser-MIG hybrid welding than traditional MIG and the comparison between casting and extrusion techniques provide some inputs for future developments in the automotive field.

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Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

2020

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The Al-Si-Ni alloy system is a source of multicomponent piston alloys, which combine good castability and wear resistance of Al-Si alloys with great thermal stability and corrosion resistance of Al-Ni alloys. [1-3] The inherent high piston temperature during engine functioning is one of the limiting factors for the application of Al-Si-based alloys. [4] On the other hand, alloys containing Al-Ni-based intermetallic compounds (IMCs) are mainly used for high-temperature structural products, which also demand wear resistance, such as aircraft engines, turbine vanes, and guide vanes of industrial steam turbines. [5,6] The formation of Ni-rich IMCs occurs even for low Ni concentrations, [7] as Ni is almost insoluble in aluminum, with a solubility of about 0.05 wt% at 640 ºC and less than 0.005 wt% at 450 ºC. [8] Thus, the addition of Ni to Al─Si alloys can potentially improve their wear resistance at elevated temperatures. Once the second phases are responsible for these characteristics, the modification of the microstructure, regarding its refinement, usually improves the properties and extends the lifetime of the component. Apart from the formation of different IMCs, the addition of new alloying elements can promote modification of other phases, mainly on Si. Kaya and Aker [9] studied ternary Al-12.6 wt% Si-2 wt% X alloys, where X was Cu, Co, Ni, Sb, or Bi. They verified that the addition of Co promotes a better distribution of Si flakes (i.e., smallest interflake spacings) and, consequently, highest hardness and tensile strength are achieved. Although the addition of Cu induced the least efficient refinement effect, the Al-12.6 wt% Si-2 wt% Cu alloy showed the second highest tensile properties. This occurred probably due to the formation of a supersaturated solid solution and hard Al 2 Cu particles. As Al 2 Cu and Al 9 Co 2 have similar hardness (588 [10] and 568 HV, [11] respectively), and Co is restricted to the formation of Al 9 Co 2 , the refinement of Si seems to have a major effect on mechanical properties. The aforementioned alloying elements are not modifiers of the eutectic Si morphology, but they just decrease the interflake spacing. Sr is a strong modifier, which is capable of transforming the acicular Si in welldistributed fibers with only a few hundred parts per million. In an Al-10 wt% Si alloy, 240 ppm of Sr has the same effect as 520 ppm of Ti-B grain refiner in terms of tensile properties. [12] Another Si modifier, Sc, also decreases the secondary dendritic arm spacing and refines the grain size; however, it requires an amount 20 times greater than that of Sr to improve the mechanical properties at the same level. [13] In secondary aluminum, Mn, [14,15] Cr, [16,17] Ni, [18,19] and other alloying elements are added to suppress the precipitation of harmful β-AlFeSi, aiming at the formation of α-AlFeSi, which has a Chinese-script morphology. Even though modification is, in general, desirable, excessive addition can lead to overmodification. Riestra et al. [20] observed in Al-11 wt% Mg 2 Si alloys, in ...

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The effect of main alloying elements on the physical properties of Al–Si foundry alloys

Cited by 104 publications

References 21 publications

Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

Study and Characterization of EN AW 6181/6082-T6 and EN AC 42100-T6 Aluminum Alloy Welding of Structural Applications: Metal Inert Gas (MIG), Cold Metal Transfer (CMT), and Fiber Laser-MIG Hybrid Comparison

Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

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