Abstract
Al2O3 particles reinforced hypereutectic Al-Si composites were prepared by in situ Fe2O3/Al reaction system. The thermodynamic analysis and microstructure evolution were investigated by differential scanning calorimetry, optical microscope, scanning electronic microscopy and transmission electron microscope. Results show that the reaction between Fe2O3 and Al is spontaneous which can be separated into two steps at different temperatures. The in situ Al2O3 particles in nano size distribute on the Al matrix accompanied with long needle-shaped β Fe-rich intermetallic phase. With different content of Mn addition, β phase can be modified to α-Al15(Mn,Fe)3Si2 and δ-Al4(Fe,Mn)Si2. Both tensile strength and elongation results at room temperature and 300 °C reveal that the optimal Fe-rich intermetallic phase is finer Chinese-script and polyhedral α phase with a Mn/Fe mass ratio 0.5 for the composites. Both in situ Al2O3 particles and α-Fe phases contribute to the properties improvement of the composites
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Funding
Funded by the National Natural Science Foundation of China (No.51201071), the National Natural Science Foundation of Jiangsu Province (No.BK20161270), Jiangsu Overseas Visiting Scholar Program for University Prominent Young & Middle-aged Teachers and Presidents (2018)
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Wang, Y., Zhang, J., Sun, C. et al. Hypereutectic Al-Si Matrix Composites Prepared by In Situ Fe2O3/Al System. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 36, 636–643 (2021). https://doi.org/10.1007/s11595-021-2455-1
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DOI: https://doi.org/10.1007/s11595-021-2455-1