Eutectic Modification of Al-Si casting alloys

Barrirero, Jenifer

doi:10.3384/diss.diva-160235

Cited by 20 publications

(9 citation statements)

References 147 publications

(280 reference statements)

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“…In addition to the ultrasonic vibration induced modification, the SiC dispersoids further enhance the heterogeneous nucleation and modification of the Eutectic Si. This is supported by a decrease in the peak temperature for the Eutectic reaction (-3°C), which is characteristic of a Eutectic Si chemical modification (Chen, Ma, and Chen 2012;Barrirero 2019). Additionally, the low energy required to melt the Mg2Si hints that the elemental Si needed to precipitate this phase was spent in the coarsening of the Eutectic Si.…”

Section: Discussionmentioning

confidence: 94%

Casting A356+SiCp with ultrasonically treated melts

Carneiro

Grilo

Puga

et al. 2022

EML

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Low mass fractions (0.05 wt%) of SiC micro sized particles have been added to an A356 melt and dispersed by ultrasonic vibration to study their impact on the microstructural morphology of cast samples. It is shown that the ultrasonic melt treatment at 680°C can promote a homogenized distribution of the reinforcement while also degassing the melt and induces a moderate grain refinement. Even though SiC may act as a nucleant, its use did not induce a significant grain refinement relatively to ultrasonically treated unreinforced melts. Adding SiC microparticles, however, seems to enhance Eutectic Si modification, although it contributes to its slight coarsening at the expense of Mg2Si.

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Section: Discussionmentioning

confidence: 94%

Casting A356+SiCp with ultrasonically treated melts

Carneiro

Grilo

Puga

et al. 2022

EML

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“…Therefore, this variation in the volume fraction of IMC reflects the hardness values, as shown in Table (7) and Figure. (8).…”

Section: 2vickershardness Measurementsmentioning

confidence: 99%

“…In previous studies, Pure aluminum was alloyed with various alloying elements to achieve the desired properties. The major alloying elements are Cu, Mn, Zn, and Si [8]. For economic and environmental requirements, and due to its high S/W ratio, high wear resistance, Effect of CuAl 2 on the Microstructure and Hardness of Al-Si-xCu Alloys Produced by Powder Metallurgy and excellent corrosion resistance, compacted powder Al-Si alloys have been commercially used in the automotive industry, particularly in the car's structure, cylinder heads, cylinder blocks, pistons and valve lifters and engine block [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of CuAl2 on the Microstructure and Hardness of Al-Si-xCu Alloys Produced by Powder Metallurgy

Alsowidy,

Humaid,

Gumaan

et al. 2023

jast

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Aluminum alloys are important in many industrial applications because of their light weight and good mechanical properties. In this study, the effect of copper addition with different percentages ( 0, 0.1, 0.2, 0.3wt. %) on the microstructure and mechanical strength of Al-Si alloy were studied using X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscope (SEM) and Vickers hardness (Hv) tests. XRD and SEM analyses showed that the Al-Si alloy consisted of α-Al and Si phases. The intermetallic compound (IMC) CuAl2 was detected with the addition of Cu. This IMC causes a change in the lattice constant and inter-atomic spacing (dhkl). The distortion and dense of the microstructure are considered indications of the enhancement in the hardness of alloys. The Vickers hardness (Hv) was measured for the samples before and after sintering. The highest value was 28.755 Hv with 0.2wt. % Cu after sintering, whereas the smallest value was 11.643 Hv without Cu content before sintering. This improvement in hardness is attributed to the temperature that promotes the diffusion of Cu atoms into theAl lattices.

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“…It is usually added to the molten aluminum in the form of a mixture of salts containing NaF. Only a trace amount (0.005 wt.%~0.01 wt.%) of Na is effective to achieve the full modification of eutectic silicon [11]. Due to the excellent modification performance and low cost, it is widely used in industries.…”

Section: Introductionmentioning

confidence: 99%

Influence of Alloying Element Mg on Na and Sr Modifying Al-7Si Hypoeutectic Alloy

Huang

Liu

2022

Materials

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The influence of alloying element Mg on Na and Sr modifying Al-7Si hypoeutectic alloys was investigated. The residual content of Na and the morphology of modified eutectic silicon were characterized. It was found that the alloying element Mg had an enhanced effect on the uptake of sodium in the Al-7Si hypoeutectic alloy modified by the Na-contained modifier. Moreover, the morphology of eutectic silicon of the modified Al-7Si alloys was significantly different from that of Al-7Si-0.4Mg alloys in the present research. When the addition of the modifier is enough, both modifiers could entirely modify the eutectic silicon phase of Al-7Si alloys, while incompletely modified eutectic silicon was observed in both Na-modified and Sr-modified Al-7Si-0.4Mg alloy. It was observed that there was an adhering relationship between the partially modified eutectic silicon with Mg-rich phases. According to the results, it can be proposed that the addition of Mg will affect the solidification behavior of alloys, thereby, leading to the incomplete modification of eutectic silicon phases.

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Eutectic Modification of Al-Si casting alloys

Abstract: ahora en esta hora inocente yo y la que fui nos sentamos en el umbral de mi mirada

Cited by 20 publications

References 147 publications

Casting A356+SiCp with ultrasonically treated melts

Casting A356+SiCp with ultrasonically treated melts

Effect of CuAl2 on the Microstructure and Hardness of Al-Si-xCu Alloys Produced by Powder Metallurgy

Influence of Alloying Element Mg on Na and Sr Modifying Al-7Si Hypoeutectic Alloy

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