Refinement of the primary Si particles in hypereutectic aluminum alloy

Hsu, Chang Chuan; Wang, Jian Yih; Huang, Jian; Lee, Shyong

doi:10.1007/s12540-012-4003-1

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Hypereutectic Al-Si alloys have been widely used in various product applications, due to their low density and thermal expansion coefficient, excellent wear and corrosion resistance, and outstanding mechanical properties [1][2][3][4][5]. However, the coarse platelet morphology of primary Si, and polygon or needle-shaped eutectic Si have detrimental effects on mechanical properties of hypereutectic Al-Si alloys [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Complex modification of hypereutectic Al-Si alloy by a new Al-Y-P master alloy

et al. 2015

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In this article, a novel Al-6Y-2P master alloy with cubic YP particles was successfully synthesized and its complex modification performance on Al-18Si alloy has also been investigated. With the doping of La and Ce, (YxLa1-x)P and (YxCe1-x)P particles still exhibit cubic morphologies in three dimensional spaces (3-D space). The excellent complex modification of Al-18Si alloy can be obtained with the addition of Al-6Y-2P master alloy. Under the optimized conditions, i.e. melting temperature of 780°C, addition level of 1.5 wt% and holding time of 30-60 min, the tensile strength and Brinell hardness of Al-18Si alloys can be significantly increased by 16.8% and 17.1%, respectively. It is proposed that the Si atoms in the melt could promote the structure evolution of YP to AlP with the release of Y, which would be reason for the excellent composite modification performance of the developed Al-6Y-2P master alloy.

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Section: Introductionmentioning

confidence: 99%

Complex modification of hypereutectic Al-Si alloy by a new Al-Y-P master alloy

et al. 2015

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“…Although some studies on the morphologies and growth mechanism of primary silicon in hypereutectic Al‐Si alloys have been reported , most papers have focused on refining of primary silicon particles . Recently, silicon morphology in the concentration range of interest of the refining process using Al‐Si alloys has been studied , and a variety of morphologies as a function of the silicon content have been reported .…”

Section: Introductionmentioning

confidence: 99%

Centrifugal separation of primary silicon crystal in solvent refining of silicon using Al‐30% Si alloy

Kim¹,

Jeon²,

Shin³

2014

Crystal Research and Technology

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This study describes the formation of a primary silicon network during separation of an Al‐30% Si melt and the process conditions to make bigger primary silicon crystals. As the crucible rotates in the centrifugal separation, the unfrozen aluminum‐rich phase and small silicon particles are pushed outside through the openings in the silicon network. As a result, primary silicon crystals are separated in the form of a foam after centrifugation. The recovery of the silicon ranged from 13 to 18% depending on the location in the crucible. The size of the primary silicon achieved by changing the cooling rate and quenching temperature during solidification is also measured using a quenching furnace. Primary silicon particles exhibit a coarse, plate‐like morphology, although small star‐like silicon particles are also found in the aluminum‐rich matrix. The fraction of plate silicon decreases, while the fraction of small globular silicon increases with an increasing cooling rate. The thickness of the primary silicon plate also decreases with an increasing cooling rate in the samples quenched at various temperatures during solidification.

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