In situ formation of SiC in Al–40Si alloy during high-pressure solidification

Zhang, Rong; Zou, Chaoying; Wei, Zunjie; Wang, Hongwei

doi:10.1016/j.ceramint.2021.05.164

Cited by 13 publications

(3 citation statements)

References 50 publications

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“…In metal matrix composites, reinforcements can be divided into two types: ex situ and in situ. We obtained in situ SiC/Al-38.6Si composites via the in situ formation of SiC in the Al-40Si-1C system under HP, and its bending strength was increased by 60.3% compared to that of Al-40Si alloy [ 28 ]. However, the holding time required for in situ synthesis of about 3 vol% SiC under HP is 30 min, which is long and costly, and it is difficult to produce a high volume fraction of SiC via an in situ reaction.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of SiC/Al-40Si Composites Fabricated by High Pressure Solidification

et al. 2023

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The microstructure and mechanical properties of SiC/Al-40Si composites prepared under high pressure were studied. As the pressure increases from 1 atm to 3 GPa, the primary Si phase in the Al-40Si alloy is refined. With increasing pressure, the composition of the eutectic point increases, the solute diffusion coefficient decreases exponentially, and the concentration of Si solute at the front of the solid–liquid interface of the primary Si is low, which contributes to the refining of the primary Si and inhibiting its faceted growth. The bending strength of SiC/Al-40Si composite prepared under 3 GPa was 334 MPa, which was 66% higher compared to the Al-40Si alloy prepared under the same pressure.

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Section: Introductionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of SiC/Al-40Si Composites Fabricated by High Pressure Solidification

et al. 2023

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“…Pressure changes the structure of matter by changing the distance between atoms and produces new structures. High pressure technology has become an effective method to synthesize new materials [1][2][3][4], study the phase transition of known materials [5][6][7][8][9], and verify the theoretical model [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Mg-Sn-Y Alloy Solidified under High Pressure and Temperature Gradient

et al. 2022

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The microstructures of Mg-1Sn-2.5Y (wt%) alloys solidified under high pressures were investigated. In addition, a mathematical model was established to analyze the effects of solidification pressure and cooling rate on the average grain size. The results show that the alloy was solidified under high pressure and temperature gradient using the cooling rate difference in the high pressure chamber, resulting in the formation of the outer equiaxed zone, the columnar zone, and the equiaxed zone in the sample. With an increase in the solidification pressure, the columnar-to-equiaxed transition was inhibited in Mg-1Sn-2.5Y alloy. In the outer fine equiaxed zone and the columnar zone, the solubility of Sn in the Mg matrix increased with an increase in solidification pressure. The average secondary dendrite arm spacing decreased from 14–17 μm under 1 GPa to 9–11 μm under 1.5 GPa. Increases in pressure and cooling rate resulted in a reduction in average grain size.

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“…[26] Therefore, employing this kind of precursor, the mechanical and thermal performances of the prepared composites were enhanced by the formation of in situ grown SiC (nanopowders/nanowhiskers/coatings). [27][28][29] DOI: 10.1002/adem.202101788…”

Section: Introductionmentioning

confidence: 99%

Effects of In Situ Grown SiC on the Microstructure and Anti‐Ablation Performance of C/C–SiC Composites Fabricated by Sol–Gel and Precursor Impregnation and Pyrolysis

Zhang

Fang

et al. 2022

Adv Eng Mater

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With the use of a novel precursor, SiC granules together with nanofibers were grown in situ in C/C felt utilizing sol–gel and precursor impregnation and pyrolysis methods. The results showed that the precursor possessed low residual carbon after the carbothermal reduction reaction. Moreover, owing to the gas–gas reaction between SiO and CO, the generated SiC largely filled the microvoids in the regions of the non‐woven layer. Furthermore, the in situ grown SiC of the composites was more continuous than the nubby SiC of polycarbosilane because of the uniform filling of SiC particles and nanofibers. All these factors are conducive to the formation of a compact layer of SiO2 during ablation by increasing the molten glass and impeding the infiltration of O2. As a result, the fabricated C/C–SiC composites exhibited better ablation resistance, and the linear and mass ablation rates were 7.284 ± 0.307 μm s−1 and 0.218 ± 0.023 mg s−1, respectively, after ablation for 120 s.

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In situ formation of SiC in Al–40Si alloy during high-pressure solidification

Cited by 13 publications

References 50 publications

Microstructural Evolution and Mechanical Properties of SiC/Al-40Si Composites Fabricated by High Pressure Solidification

Microstructural Evolution and Mechanical Properties of SiC/Al-40Si Composites Fabricated by High Pressure Solidification

Microstructure Evolution of Mg-Sn-Y Alloy Solidified under High Pressure and Temperature Gradient

Effects of In Situ Grown SiC on the Microstructure and Anti‐Ablation Performance of C/C–SiC Composites Fabricated by Sol–Gel and Precursor Impregnation and Pyrolysis

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