Thermodynamic assessment of the Al–P system based on original experimental data

Liang, Song‐Mao; Schmid–Fetzer, Rainer

doi:10.1016/j.calphad.2013.07.001

Cited by 25 publications

(9 citation statements)

References 45 publications

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“…This strongly indicates that, in as-cast conditions, P is more likely to be in the form of AlP particles, which is fully consistent with the solubility of P in Al being very low (e.g. 40 ppm) 25 26 and the presence of Si up to 18 wt.% as well as other possible impurities (e.g. Fe, Cu) do not affect significantly the P solubility 27 .…”

Section: Resultssupporting

confidence: 72%

“…Due to the very limited solubility of P within Al (e.g. 40 ppm) 25 26 and Si, no significant amount of P was detected within eutectic Si and the Al matrix, as clearly shown in Figs 3 and 4 .…”

Section: Resultsmentioning

confidence: 90%

“…6b , confirms that the AlP particle formed at the surface of Al matrix, and subsequently acted as an efficient heterogeneous nucleation site for eutectic Si. It has been reported that even for extremely low P concentrations and large undercooling the direct nucleation of Si on Al does not occur and that it is instead triggered by the formation of AlP under clean conditions 25 26 27 . It is the formation of AlP particles on the surface of the Al matrix that enhances the heterogeneous nucleation of eutectic Si, which is similar to the well-known fact that the adsorption of Al 3 Ti on the TiB 2 particle promotes the heterogeneous nucleation of Al grain on the TiB 2 particle and thereby enhances the grain refinement potency of the TiB 2 particle 29 30 .…”

Section: Discussionmentioning

confidence: 99%

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Revealing heterogeneous nucleation of primary Si and eutectic Si by AlP in hypereutectic Al-Si alloys

Hage

Liu

et al. 2016

Sci Rep

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The heterogeneous nucleation of primary Si and eutectic Si can be attributed to the presence of AlP. Although P, in the form of AlP particles, is usually observed in the centre of primary Si, there is still a lack of detailed investigations on the distribution of P within primary Si and eutectic Si in hypereutectic Al-Si alloys at the atomic scale. Here, we report an atomic-scale experimental investigation on the distribution of P in hypereutectic Al-Si alloys. P, in the form of AlP particles, was observed in the centre of primary Si. However, no significant amount of P was detected within primary Si, eutectic Si and the Al matrix. Instead, P was observed at the interface between the Al matrix and eutectic Si, strongly indicating that P, in the form of AlP particles (or AlP ‘patch’ dependent on the P concentration), may have nucleated on the surface of the Al matrix and thereby enhanced the heterogeneous nucleation of eutectic Si. The present investigation reveals some novel insights into heterogeneous nucleation of primary Si and eutectic Si by AlP in hypereutectic Al-Si alloys and can be used to further develop heterogeneous nucleation mechanisms based on adsorption.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

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Revealing heterogeneous nucleation of primary Si and eutectic Si by AlP in hypereutectic Al-Si alloys

Hage

Liu

et al. 2016

Sci Rep

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“…A new Calphad-type dataset has been developed for the quaternary Al-Si-P-Sr system by combining the well validated binary subsystems Al-Si [18], Al-P [19,20], Al-Sr [21], Si-P [22], Si-Sr [23], and the ternary subsystems Al-Si-P [18] and Al-Si-Sr [24]. For the P-Sr binary system, no phase diagram is available and only the intermetallic phase Sr 3 P 2 is reported in the literature [25].…”

Section: Thermodynamic Al-si-p-sr Dataset and Thermodynamic Computationsmentioning

confidence: 99%

Impact of P and Sr on solidification sequence and morphology of hypoeutectic Al–Si alloys: Combined thermodynamic computation and phase-field simulation

et al. 2015

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“…Detailed information on phosphorus allotropes is given in our previous paper on the Al-P system. [20] Three silicon phosphides, Si 2 P, SiP and SiP 2 , have been reported. The Si 2 P phase was only reported by Fritz and Berkenhoff, [21] produced at 450°C and decomposing into (Si) and SiP phase at 600°C.…”

Section: Crystal Structure Of Solid Phasesmentioning

confidence: 99%

Modeling of Thermodynamic Properties and Phase Equilibria of the Si-P System

Liang

Schmid–Fetzer

2013

J. Phase Equilib. Diffus.

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A Calphad assessment of the Si-P system is performed based on critical review of all available original experimental thermodynamic and phase equilibrium data. It is demonstrated that a simple disordered substitutional solution model is sufficient for the liquid phase and that previous assumptions of short-range ordering in the Si-P liquid phase may not be justified. Alternative model descriptions for the Gibbs energy of the (Si) solid solution phase were developed to reveal the consequences in describing the largely scattering solid solubility data of P in (Si). Two alternative sets of consistently calculated phase boundaries of the (Si) phase are shown. It is impossible to reconcile the only experimental (Si) solidus data with the solvus data from the same work.

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Thermodynamic assessment of the Al–P system based on original experimental data

Cited by 25 publications

References 45 publications

Revealing heterogeneous nucleation of primary Si and eutectic Si by AlP in hypereutectic Al-Si alloys

Revealing heterogeneous nucleation of primary Si and eutectic Si by AlP in hypereutectic Al-Si alloys

Impact of P and Sr on solidification sequence and morphology of hypoeutectic Al–Si alloys: Combined thermodynamic computation and phase-field simulation

Modeling of Thermodynamic Properties and Phase Equilibria of the Si-P System

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