Fabrication of SiC particles-reinforced magnesium matrix composite by ultrasonic vibration |
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Authors: | K B Nie X J Wang K Wu L Xu M Y Zheng X S Hu |
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Affiliation: | (1) School of Materials Science and Engineering, Harbin Institute of Technology, No. 92, West Da-Zhi Street, Harbin, 150001, People’s Republic of China |
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Abstract: | Magnesium matrix composites reinforced with two volume fractions (1 and 3%) of SiC particles (1 μm) were successfully fabricated
by ultrasonic vibration. Compared with as-cast AZ91 alloy, with the addition of the SiC particles grain size of matrix decreased,
while most of the phase Mg17Al12 varied from coarse plates to lamellar precipitates in the SiCp/AZ91 composites. With increasing volume fraction of the SiC
particles, grains of matrix in the SiCp/AZ91 composites were gradually refined. The SiC particles were located mainly at grain
boundaries in both 1 vol% SiCp/AZ91 composite and 3 vol% SiCp/AZ91 composite. SiC particles inside the particle clusters may
be still separated by magnesium. The study of the interface between the SiC particle and the alloy matrix suggested that SiC
particles bonded well with the alloy matrix without interfacial reaction. The ultimate tensile strength, yield strength, and
elongation to fracture of the SiCp/AZ91 composites were simultaneously improved compared with that of the as-cast AZ91 alloy. |
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