Microstructure evolution of rare earth Pr modified alumina-silicate short fiber-reinforced Al-Si metal matrix composites |
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| Authors: | Jihua Peng Wenfang Li Fangliang Huang Jun Tian Gang Liu Jun Du |
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| Affiliation: | School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China |
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| Abstract: | Al-Si metal matrix composites (MMCs) reinforced with 20 vol.% alumina-silicate shot fibers (Al2O3-SiO2(sf)) were fabricated by an infiltra-tion squeeze method. Pure Pr metal was added into these composites. The effect of Pr addition on the microstructure evolution of Al-Si MMCs was investigated by SEM, TEM, and EDS. Pr addition is favorable to make uniform microstructures with the modified eutectic Si crystal. PrAISi phase with high contents of Pr and Si is observed on the interface between the fiber and the matrix. The addition of Pr pro-motes interface SiO2 reduction, and SiO2 comes from the crystallization of Al2O3-SiO2 short fibers. |
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| Keywords: | metal matrix composite microstructure evolution microscope Al-Si alloys rare earth |
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