The dispersive orientated-precipitation of AlP on alumina film and its effect on the primary Si gathering behavior in the Al–Si alloy surface layer

Zhu, Xiangzhen; Wu, Yuying; Li, Chong; Li, Pengting; Hu, Qiao; Liu, Xiangfa

doi:10.1039/c4ce00106k

Cited by 7 publications

(4 citation statements)

References 33 publications

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“…It was found that a black phase exists in the center of primary Si phase, and is rich in Al, P and O elements. It is considered that this black phase is AlP, and the existence of O element is due to the oxidation and hydrolysis of AlP during specimen preparation [7]. AlP phase and Si phase have the same face-centered cubic (fcc) crystal structure and very similar lattice parameters (aAlP = 5.45 Å, aSi = 5.42 Å), as shown in Figure 4.…”

Section: Experimental and Computational Methodsmentioning

confidence: 88%

“…In 1933, researchers found that AlP is a very effective compound to modify primary Si phase [6]. Due to the similar crystal parameters, AlP phase could act as high-efficiency heterogeneous nucleation substrate for the primary Si, resulting in an increase in the number of small Si particles [6][7][8][9][10]. Since then, many modifiers contained P have been invented, such as Cu-P alloy, Si-P alloy and Al-P alloy.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Mg Adding Order on the Liquid Structure and Solidified Microstructure of the Al-Si-Mg-P Alloy: An Experiment and ab Initio Study

Zhu¹,

Jiang²,

Li³

et al. 2014

Metals

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Abstract:In this paper, the relationship between the liquid structure and the corresponding solidified microstructure of an Al-Si-Mg-P alloy was studied. Experimental results show that Mg can reduce the phosphorous-modification effect if it was added after adding Al-P alloy. However, when it is added before adding Al-P alloy, Mg has no effect on the phosphorous-modification. It is considered that the difference in liquid structure induced by changing the adding order of Mg should be responsible for the above phenomenon, and was investigated by ab initio molecular dynamics simulation (AIMD). It was believed that the high-active Mg atoms could bond P atoms to form P-Mg clusters and then reduce the modification effect of AlP, when pure Mg was added into the prepared Al-Si-P melt. When the pure Mg was added into Al-Si melt before adding Al-P alloy, the Mg atoms would be first occupied by Si atoms to form Mg-Si clusters, and thus lose the ability to eliminate P-Al clusters which dissolve into melt later, leading to a good phosphorous-modification effect.

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Section: Experimental and Computational Methodsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The Effect of Mg Adding Order on the Liquid Structure and Solidified Microstructure of the Al-Si-Mg-P Alloy: An Experiment and ab Initio Study

Zhu¹,

Jiang²,

Li³

et al. 2014

Metals

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“…It can be seen from the figure that the Al-Ti-C-B master alloy contains TiB 2 and TiC particles with sub-micron size and uniform distribution in the master alloy. The Al-3.5P master alloy used in the experiment is composed of aluminum matrix and AlP particles [ 23 ].…”

Section: Resultsmentioning

confidence: 99%

Duplex Nucleation and Its Effect on the Grain Size and Properties of Near Eutectic Al-Si Alloys

et al. 2022

Materials

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Duplex nucleation and its effect on the grain size and properties of near eutectic Al-Si alloys were investigated in this work. It is found that the grain size of Al-13Si-1Cu alloy can be greatly refined by addition of Al-2Ti-0.5B-0.5C and Al-P master alloys, and TiB2/AlP duplex nucleation was observed at the nuclei of primary silicon in the process of studying the refinement mechanism. TiB2 phase coated by Al co-existed with AlP in the nuclei of primary Si. The existence of Al phase should not only guarantee the promotion of TiB2 particles on the nucleation of AlP particles, but also made TiB2 particle stable in the core of primary silicon through the interaction with the Si phase. Duplex nucleation can not only affect the grain size of Al-Si alloy, but also effect of the distribution of strengthening phases in Al-Si alloy and improve the properties. Compared with single Al-P master alloy treatment, the tensile strength of Al-12Si-4Cu-2Ni-1Mg alloy after duplex nucleation treatment are improved obviously. The fatigue performance of Al-12Si-4Cu-2Ni-1Mg alloy is also improved significantly by the duplex nucleation.

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“…[14] A high phosphorous concentration in the liquid adjacent to the wetted oxide surface would be required for the formation of numerous AlP particles to nucleate the primary type silicon observed in Figures 2(a) and 3(a). Zhu et al [27] showed that AlP tended to nucleate on or attach to the c-Al 2 O 3 oxide formed on the surface of an Al-13.5Si-0.03P alloy. However, the phosphorus content in their study was significantly higher than the typical impurity levels in hypoeutectic Al-Si alloys.…”

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confidence: 99%

Formation of Coarse Silicon Near the Surface of Al–7Si–Mg Semi-solid Castings

Santos

Jarfors

Dahle

2021

Metall Mater Trans A

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Primary type polyhedral silicon crystals were observed in the vicinity of oxides located at or near the surface of strontium modified semi-solid Al–7Si–Mg castings. The coarse silicon polyhedrons were observed mainly on the outer side of oxides surrounding the macrosegregation regions. The silicon crystals most likely nucleated on AlP-particles located near the oxides. These AlP particles may nucleate on the wetted surface of oxides, or form at different locations in the interdendritic regions.

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The dispersive orientated-precipitation of AlP on alumina film and its effect on the primary Si gathering behavior in the Al–Si alloy surface layer

Cited by 7 publications

References 33 publications

The Effect of Mg Adding Order on the Liquid Structure and Solidified Microstructure of the Al-Si-Mg-P Alloy: An Experiment and ab Initio Study

The Effect of Mg Adding Order on the Liquid Structure and Solidified Microstructure of the Al-Si-Mg-P Alloy: An Experiment and ab Initio Study

Duplex Nucleation and Its Effect on the Grain Size and Properties of Near Eutectic Al-Si Alloys

Formation of Coarse Silicon Near the Surface of Al–7Si–Mg Semi-solid Castings

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