Comparison among chemical and electromagnetic stirring and vibration melt treatments for Al–Si hypereutectic alloys

Hernández, Francisco C. Robles; Sokolowski, J. H.

doi:10.1016/j.jallcom.2006.09.039

Cited by 99 publications

(31 citation statements)

References 23 publications

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“…In addition, the cooling curve, superheating and hardness of the alloy were also analyzed. mechanical/electromagnetic stirring treatment [13][14][15] . …”

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confidence: 99%

Effect of phosphorus and heat treatment on microstructure of Al-25%Si alloy

Dang

Jian

et al. 2017

China Foundry

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T he hypereutectic Al-Si alloys play an important role in the fields of automotive and aerospace industries due to their excellent casting ability, low thermal expansion coefficient and high wear resistance [1][2][3] . The microstructure evolution of hypereutectic Al-Si alloy is mainly divided into two stages during solidification: the precipitation of primary silicon and subsequent eutectic transformation. The morphology and distribution of silicon affect the mechanical properties and application scope of the alloys. For hypereutectic Al-Si alloys, the coarse primary silicon may easily produce stress concentration, form the crack and accelerate the crack growth. To gain better mechanical properties, modification treatment and heat treatment are carried out for hypereutectic Al-Si alloys to change the morphology, size and distribution of silicon phase. Modification treatment can significantly improve the morphology and distribution of silicon [4][5][6][7][8][9] . Heat treatment aims at acquisitions of supersaturated solution, high density vacancies and spheroidization of eutectic Si. Many researchers have focused on the improvement of modifiers to meet the requirements of environmental protection and industry applications. The common methods of modification are chemical treatment by modifiers [5][6][7][8][9] , melt thermal treatment [10][11][12] and Abstract: It is known that phosphorus can refine the primary silicon and heat treatment can spheroidize the eutectic silicon. This paper presents an optimal combination of heat treatment processes and P refinement on hypereutectic Al-Si alloy. The optimal P addition amount, and the solution and aging temperatures for Al-25%Si alloy were obtained through the orthogonal experiment, and their modification effects were discussed. The results show that P addition has the greatest modification effect, followed by aging temperature, and the modification effect of solution temperature is the least. The optimized modification parameters are: addition of 0.6% P, solution at 540 ºC and aging at 160 ºC . In addition, the cooling curve, superheating and hardness of the alloy were also analyzed. mechanical/electromagnetic stirring treatment [13][14][15] . Key words:Refinement by element addition has been widely applied in traditional casting Al-Si alloy due to simplicity and validity [4][5][6][7][8][9] . P is one of the most effective modifiers and refiners of primary Si particles and can be added into the melt as master alloys, such as Si-P [5] , Cu-P [6] , Al-P [7] , Al-Si-P [8] and Al-Zr-P [9] . Adding P to Al-Si hypereutectic alloy can reduce the size of primary Si particles by the active nuclei sites [16] . Wu Yaping found the best modification effect can be achieved when Si-P master alloy is added into Al melt before the addition of silicon instead of directly adding into Al-24%Si alloy melt, because AlP can form after adding the Si-P into Al melt which can act as the nuclei of primary Si phases during the solidification process. The optimized modification parameters were mo...

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“…In addition, the cooling curve, superheating and hardness of the alloy were also analyzed. mechanical/electromagnetic stirring treatment [13][14][15] . …”

mentioning

confidence: 99%

Effect of phosphorus and heat treatment on microstructure of Al-25%Si alloy

Dang

Jian

et al. 2017

China Foundry

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“…These results on the effect of Sr addition on T 1 are presented in Figure 5 together with previous results. [9,[14][15][16] While the results show a lot of scatter, the overall downward trend with increasing Sr additions is evident. Any effect of additional P is within experimental scatter.…”

Section: Discussionmentioning

confidence: 96%

“…Song et al [13] reported that 0.02 wt pct P raised the primary silicon start temperature T 1 by 5.5 K in their BH135 alloy. Nogita et al [14] reported that addition of 50 to 360 ppm Sr reduced the primary silicon reaction temperature of Al-17 wt pct Si by some 40 K, while Robles Hernandez and Sokolowski [15] reported that 60 ppm P raised T 1 by 2.3 K while 60 ppm Sr raised T 1 by 1.8 K in the presence of 60 ppm P. In contrast, Nafisi et al [16] reported a 65 K reduction in T 1 on addition of 1500 ppm Sr in the presence of 500 ppm P.…”

Section: Faraji I Todd and H Jonesmentioning

confidence: 99%

Effect of Phosphorus and Strontium Additions on Formation Temperature and Nucleation Density of Primary Silicon in Al-19 Wt Pct Si Alloy and Their Effect on Eutectic Temperature

Faraji

Todd

Jones

2009

Metall Mater Trans A

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“…Therefore, the overall compressive behavior of the produced foam is improved. The beneficial effects of the electromagnetic stirring technique in producing a defect-free casting have been reported in different studies [26,27]. deformation stage; (ii) plateau deformation stage; and (iii) densification deformation.…”

Section: Compressive Propertiesmentioning

confidence: 99%

Melt Processing and Characterization of Al-SiC Nanocomposite, Al, and Mg Foam Materials

Nabawy

Khalil

Al-Ahmari

et al. 2016

Metals

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Abstract:In the present work, metallic foams of Al, Mg and an Al-SiC nanocomposite (MMNC) have been fabricated using a new manufacturing technique by employing melt infiltration assisted with an electromagnetic force. The aim of this investigation was to study and to develop a reliable manufacturing technique consisting of different types of metallic foams. In this technique, an electromagnetic force was used to assist the infiltration of Al-SiC slurry and of pure liquid metal into a leachable pattern of NaCl, thus providing perfect cellular structures with micro-sized porosities. A high frequency induction coil unit equipped with a vacuum chamber and a hydraulic press was used to manufacture the foam materials. Microstructures of the produced foam materials were explored by using Field Emission Scanning Electron Microscopy (FESEM). The mechanical behavior of the manufactured foams was investigated by applying compression testing. The results indicate a high applicability of the new technique in producing metallic foams of pure metals and of a metal matrix nanocomposite . The produced foam materials displayed isotropic cellular structures with excellent compressive behaviors. Microstructure measurements indicate that the average pore size and strut thickness that can be achieved are in the ranges of 100-500 µm and 50-100 µm, respectively. The produced foam of the Al-SiC nanocomposite material provided the highest strength of 50 MPa prior to the densification stage, which equates to 25 times, and 10 times higher than the strength levels that were obtained by Al, and Mg foams, respectively.

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Comparison among chemical and electromagnetic stirring and vibration melt treatments for Al–Si hypereutectic alloys

Cited by 99 publications

References 23 publications

Effect of phosphorus and heat treatment on microstructure of Al-25%Si alloy

Effect of phosphorus and heat treatment on microstructure of Al-25%Si alloy

Effect of Phosphorus and Strontium Additions on Formation Temperature and Nucleation Density of Primary Silicon in Al-19 Wt Pct Si Alloy and Their Effect on Eutectic Temperature

Melt Processing and Characterization of Al-SiC Nanocomposite, Al, and Mg Foam Materials

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