Al-Si-P master alloy and its modification and refinement performance on Al-Si alloys

Zuo, Min; Liu, Xiangfa; Dai, Hongshang; Liu, Xiangjun

doi:10.1007/s12598-009-0080-9

Cited by 24 publications

(13 citation statements)

References 18 publications

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“…1, it can be seen that the undercooling is markedly reduced from 13.4 °C to 8.9 °C by increasing P from 0.2% to 0.6%. This is because the granular AlP in the melt may precipitate at the region with a higher P concentration, and they also often combine with primary Si, which results from the higher reaction temperature [8] . Figure 2 shows the microstructures of unmodified and modified Al-25%Si alloys with different pouring temperatures.…”

Section: Cooling Curvesmentioning

confidence: 99%

“…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] .…”

Section: Introductionmentioning

confidence: 99%

“…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] .…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

“…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.…”

mentioning

confidence: 99%

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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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Section: Cooling Curvesmentioning

confidence: 99%