Solute adsorption and entrapment during eutectic Si growth in A–Si-based alloys

Li, Jiehua; Albu, Mihaela; Hofer, Ferdinand; Schumacher, Peter

doi:10.1016/j.actamat.2014.09.040

Cited by 132 publications

(54 citation statements)

References 20 publications

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“…Recently, Li et al [25] proposed that the adsorption of Sr (or Na) atoms causes the changes in growth direction and multiplication of twins, while the entrainment of Al together with the modifier is an artefact rather than an active factor for the modification. They propose that the formation of Al-Si-Srrich clusters takes place after the adsorption of Sr (or Na) atoms during the subsequent overgrowth of Si.…”

mentioning

confidence: 99%

Cluster formation at the Si/liquid interface in Sr and Na modified Al–Si alloys

Barrirero

Engstler

et al. 2016

Scripta Materialia

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mentioning

confidence: 99%

Cluster formation at the Si/liquid interface in Sr and Na modified Al–Si alloys

Barrirero

Engstler

et al. 2016

Scripta Materialia

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“…A similar process has been identified for the modification of AlSi alloys by P in entrained droplet studies [47][48][49]. In this case the nucleation of Si is catalyzed by the formation of AlP precipitates at the liquid-solid interface.…”

Section: Environment Effects On Nucleation Undercoolingmentioning

confidence: 67%

Melt undercooling and nucleation kinetics

Perepezko

Wilde

2016

Current Opinion in Solid State and Materials Science

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a b s t r a c tWhile melt undercooling is often observed during solidification the control of undercooling and nucleation is difficult due to the numerous possible heterogeneous sites present in even high purity melts. The identification of active nucleation sites has been a continuing challenge that requires developing well planned experimentation. In samples with well-defined and controlled undercooling, the identification can be established for a number of the active sites and mechanisms that can act to catalyze nucleation. The sites and mechanisms that have been identified involve primary phases developed during cooling of alloy melts, liquid-added particle interfaces being modified (e.g. by adsorption or reaction) creating a particle type independent nucleation potency, dissolved impurities precipitating out of the melt at high undercooling or acting to alter local atomic arrangements in the melt to catalyze nucleation and nucleation sites resulting from residual solid preserved in cavities in inclusions or surface coatings. Recent advances in clarifying the structure of liquids reveal local atomic arrangements such as short range order, medium range order and cluster structures, but the role of these local heterogeneities on the undercooling and crystallization behavior is incompletely understood at present.

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“…However, no twin or particles is observed in Figure 7c. Considering that the Sr concentration, which is approximately 0.075%, is sufficiently high to modify the eutectic Si [30]. Then, the poisoning effects due to multiple modifications could be excluded.…”

Section: Resultsmentioning

confidence: 99%

The Formation of Nanoparticles and Their Competitive Interaction with Twins during Eutectic Si Growth

et al. 2018

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In order to investigate the competitive interaction between nanoparticles and twin, the eutectic Si microstructures in Al–10Si (wt. %) base alloys with exclusive and combined addition of Sr and Sb are characterized by combined TEM and atom probe tomography (APT). The chemical short range order in Sb–Sb and Sb–Sr pairs is revealed by ab initio molecular dynamics simulation, which promotes the formation of clusters and nanoparticles. The coexistence of nanoparticles and twins is observed in Sb containing alloys, with a negative correlation in the corresponding number density, owing to the competitive stacking of precursors and individual atoms at the solid–liquid interface. Large size particles around 70 nm with a uniform distribution of Sr atoms are formed in Al–10Si–0.35Sb–0.015Sr (wt. %) alloys, due to the precursor aggregation and homogeneous nucleation in the droplets that nucleation are depressed. A model for the formation of nanoparticles and their interaction with twins is proposed.

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Solute adsorption and entrapment during eutectic Si growth in A–Si-based alloys

Cited by 132 publications

References 20 publications

Cluster formation at the Si/liquid interface in Sr and Na modified Al–Si alloys

Cluster formation at the Si/liquid interface in Sr and Na modified Al–Si alloys

Melt undercooling and nucleation kinetics

The Formation of Nanoparticles and Their Competitive Interaction with Twins during Eutectic Si Growth

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