1. In situ formation of SiC in Al–40Si alloy during high-pressure solidification
- Author
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Chunming Zou, Rong Zhang, Zunjie Wei, and Hongwei Wang
- Subjects
010302 applied physics ,In situ ,Materials science ,Fabrication ,Process Chemistry and Technology ,Alloy ,Composite number ,02 engineering and technology ,Bending ,engineering.material ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,High pressure ,0103 physical sciences ,Materials Chemistry ,Ceramics and Composites ,engineering ,Relative density ,Composite material ,0210 nano-technology - Abstract
The in situ formation of SiC in Al–40Si alloys during the fabrication of SiC/Al–Si composites by high-pressure solidification were investigated. The results demonstrate that the in situ formation of SiC occurs by a gradual conversion of Al4C3 and Al4SiC4 to SiC. In situ SiC can be formed in an Al–40Si alloy solidified under a pressure of 3 GPa at a temperature of 1373 K. The SiC particles (SiCp) formed in situ was compatible with the α-Al matrix and the Si phases. The relative density of the SiC/Al-38.6Si composite was 99.9%. The bending strengths of the Al–40Si alloy and the SiC/Al-38.6Si composite obtained by solidification under a pressure of 3 GPa were 200.8 MPa and 322 MPa, respectively, which represents an enhancement of 60.3% as a result of reinforcement by the in situ-formed SiC.
- Published
- 2021