Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing

Zhang, Z.; Li, H. T.; Stone, Ian; Fan, Z.

doi:10.1088/1757-899x/27/1/012042

Cited by 8 publications

(3 citation statements)

References 19 publications

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“…Встановлено, що однаковій долі твердої фази зі збільшенням швидкости перемішування відповідають більш дрібні та округлені частинки кремнію. Аналогічний ефект спостерігався в [36]. Дослі-ДЕЯКІ МЕТОДИ ПІДВИЩЕННЯ ВЛАСТИВОСТЕЙ ЗАЕВТЕКТИЧНИХ СИЛУМІНІВ 101 джувався стоп Al-15% ваг.…”

Section: перемішування розтопуunclassified

Some Modern Methods of Improving the Properties of Hypereutectic Al–Si Alloys

Borisov¹,

Tzir²

2023

Metallofiz. Noveishie Tekhnol.

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В огляді відображено останні досягнення в основних напрямах впливів на заевтектичні силуміни, що дають змогу істотно підвищити комплекс їхніх механічних властивостей, як у традиційних напрямах типу модифікування або умов лиття, так і енергетичних, що з'явилися порівняно недавно. Відзначається характерне для останнього часу комплексне застосування різних методик.Ключові слова: заевтектичні силуміни, модифікування, ультразвук, спеціяльні методи лиття, вплив заліза.The review reflects the latest achievements in the main areas of influence on hypereutectic silumins, which make it possible to significantly increase the complex of their mechanical properties, both in traditional areas such as modification or casting conditions and in relatively recent energy ones. The complex application of various methods, characteristic of recent times, is noted.

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Section: перемішування розтопуunclassified

Some Modern Methods of Improving the Properties of Hypereutectic Al–Si Alloys

Borisov¹,

Tzir²

2023

Metallofiz. Noveishie Tekhnol.

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“…Solidification is completed by the crystallization of the eutectic. Eutectic Si in these alloys is present as a thick needle, which can lead to earlier crack initiation and tensile fracture and deterioration of mechanical properties [3,[5][6]. Therefore, refinement of primary Si and modification of eutectic Si are the key to improving mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Study of Si morphology in AlSi21CuNiMg cast alloy using col our and deep etching

Tillová,

Chalupová,

Kuchariková

et al. 2023

Bulletin of the Polish Academy of Sciences Technical Sciences

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The effect of possible modification and refining effect of Al-Cu-P-based pre-alloy combined with Fe on the microstructure and the silicon morphology change in hypereutectic Al-Si cast alloy was studied. The samples in the as-cast state were observed by optical and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The 3D morphology of both primary and eutectic silicon was observed by using colour and deep etching in detail. The results showed that the AlCu19P1.4 pre-alloy (1.07 wt.%) combined with the addition of Fe (0.02 wt.%) has a significant effect on the change of the amount, size and morphology of primary Si. This is significantly refined and changes the shape from a coarse irregular starshaped, polyhedral, or plate-like shape to a fine polyhedral shape. The average size of the primary Si is reduced by about of 78 % from 135 μm to 28 μm and the number of primary Si particles increased from 7.4 to 237. No change in the morphology of the eutectic Si was observed; a refinement of the structure from a coarse needle/plate-like to a fine plate-like structure was seen. The depth etching method using HCl was very effective in the study of the 3D silicon morphology observed, which could be observed in detail without the presence of artefacts.

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“…Furthermore, Zhang et al [12] found that Si particles were formed on oxide particles upon solidification of Al-15Si alloy. They believed that the distribution of oxide films as well dispersed, discrete, nano scale oxide particles can act as potent and efficient heterogeneous substrates for the nucleation of primary Si.…”

Section: Introductionmentioning

confidence: 99%

Refinement of Primary Silicon Crystals by Novel P-Doped γ-Al<sub>2</sub>O<sub>3</sub> Particles in Solidification of Hypereutectic Al-Si Alloys

Al-Helal

Stone

Fan

2016

MSF

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P-doped γ-Al2O3 was found to be a potent substrate to nucleate primary silicon whilst good modification of the eutectic matrix is retained during solidification of hypereutectic Al-Si alloys. On using P-doped γ-Al2O3 could be a perfect and clean source of P without additional impurities. The optical micrographs show that the morphologies of primary silicon crystals in solidification of Al-18Si alloy are changed from irregular coarse morphologies to fine regular particles. The average particle size of primary Si decreased from 52 μm to 25 μm and 22 μm in adding P-doped α-Al2O3 and P-doped γ-Al2O3 respectively. It was clear that P-doped γ-Al2O3 led to good refinement of primary Si and the modification effect on eutectic Si was retained in solidification of commercial purity Al-18Si alloy. Adding P-doped γ-Al2O3 give a good primary Si refinement to Al-18Si alloy if compared with the addition of P and using finer P doped γ-Al2O3 powder give narrower particle size range similar to that of adding P.

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Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing

Cited by 8 publications

References 19 publications

Some Modern Methods of Improving the Properties of Hypereutectic Al–Si Alloys

Some Modern Methods of Improving the Properties of Hypereutectic Al–Si Alloys

Study of Si morphology in AlSi21CuNiMg cast alloy using col our and deep etching

Refinement of Primary Silicon Crystals by Novel P-Doped γ-Al<sub>2</sub>O<sub>3</sub> Particles in Solidification of Hypereutectic Al-Si Alloys

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