The effects of processing parameters on the microstructure and mechanical properties of modified B390 alloy in direct squeeze casting

Maeng, D.Y.; Lee, J.H; Won, C.W.; Cho, S.S; Chun, Byong Sun

doi:10.1016/s0924-0136(00)00527-6

Cited by 68 publications

(34 citation statements)

References 13 publications

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“…The hardness of Al-Si alloys is affected by the size of primary silicon, and the heterogeneous nuclei of AlP particles can refine the primary Si, so it can dramatically improve the hardness of alloys. This can be confirmed by some previous studies [7,17,27] , which show that the refinement of primary silicon contributes to the improvement of hardness of Al-Si alloys.…”

Section: Hardness Testssupporting

confidence: 87%

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: Hardness Testssupporting

confidence: 87%

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

Dang

Jian

et al. 2017

China Foundry

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“…It is clear from the value of change in Gibbs free energy that the reaction can occur spontaneously below 1073 K. Consequently, the formed AlP particles take as heterogeneous nuclei for primary Si due to their similar crystal lattice. Maeng et al [1] found that a higher modification temperature is necessary for a Cu-P master alloy. It is reasonable to deduce that treatment temperature would influence the reaction rate and consequently impact the refinement effect.…”

Section: Comparison Of Modification Effect and P Recovery Between Al-mentioning

confidence: 99%

“…These undissolved AlP would become the dregs and float to the surface and cannot act as the nucleation sites of primary Si. During the solidification process, the solubility of P in the melt decreases with increasing temperature; P in solution reform lots of new AlP particles: P [1] + Al [l] → AlP [s] . Since AlP and Si have similar crystal structures and lattice parameters, primary Si can nucleate heterogeneously on solid AlP particles [17][18][19][20][21].…”

Section: Comparison Of Modification Effect and P Recovery Between Al-mentioning

confidence: 99%

“…Considerable interest in replacing cast iron with Al alloys has been concentrated on the automotive industry to improve energy efficiency and meet environmental requirements [1][2]. Among them, eutectic and hypereutectic Al-Si alloys have been widely used due to their excellent combination of properties such as low thermal expansion and high wear resistance as well as good castability [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Al-Cu-P and Al-Fe-P master alloys mentioned in Refs. [1,14] have the disadvantages of contamination of Cu or Fe composition.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2009

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An Al-Si-P master alloy has been developed by an in-situ reaction and the electron probe microanalyzer (EPMA) results show that there are many pre-formed AlP particles contained in the master alloy. Silicon introduced into the system plays an important role in remarkably improving the distribution and content of AlP particles due to their similar crystal structure and lattice parameters. ZL109 alloys have shown fast modification response to the addition of 0.5% Al-15Si-3.5P master alloy at 720°C, with a mass of primary Si precipitating in size of about 15 μm. Also, coarse primary Si grains in Al-30Si alloy can be refined dramatically from 150 μm to 37 μm after the addition of 2.0% Al-15Si-3.5P master alloy at 850°C. The P recovery of the Al-15Si-3.5P master alloy is much higher than that of a Cu-8.5P master alloy due to the pre-formed AlP particles.

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Solidification of Iron‐Rich Intermetallics in Squeeze cast Al‐5.0Cu‐0.5 Fe Alloys with Different Mn/Fe Ratio

Zhang¹,

Lin²,

Zhang³

et al. 2013

Pricm

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The solidi¿cation characteristics of iron-rich intermetallics in squeeze cast Al-5.0Cu-0.5Fe alloys with different Mn/Fe ratio have been investigated by optical microscope, scanning electronic microscope and differential scanning calorimeter. The results show that high Mn/Fe ratio promotes the formation of Chinese script D-Fe and prevents the precipitate of Al m Fe and needle-like E-Fe. Only Mn/Fe ratio of 0.8 is demanded for the cRPSOHWHO\ FRQYHUVLRQ RI ȕ-Fe phase to Chinese script iron-rich intermetallics when the applied pressure is 75 MPa. The formation temperature increases for D-Fe but decreases for E-Fe with increasing the applied pressure. The full solidification sequence of the squeeze cast Al-5.0Cu-0.5Fe alloys with different Mn/Fe ratio has been established.

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The effects of processing parameters on the microstructure and mechanical properties of modified B390 alloy in direct squeeze casting

Cited by 68 publications

References 13 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

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

Solidification of Iron‐Rich Intermetallics in Squeeze cast Al‐5.0Cu‐0.5 Fe Alloys with Different Mn/Fe Ratio

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