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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Influence of high intensity ultrasonic vibration on microstructure of
in-situ synthesized Mg2Si/Mg composites
CHEN Ke(陈  可), LI Zi-quan(李子全), ZHOU Heng-zhi(周衡志), WANG Wei(王  伟)

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics,
 Nanjing 210016, China

Abstract:Coarse and agglomerated primary Mg2Si phase in in-situ synthesized Mg2Si/Mg composite with 4%Si was treated in remelting process by means of high intensity ultrasonic vibration. The effects of ultrasonic vibration duration and temperature on size, morphology and distribution of the primary Mg2Si were studied. The evolution mechanism was discussed. The microstructures of the composites were investigated by means of optical microscopy (OM) and scanning electronic microscopy (SEM). The components were inspected with energy dispersion spectrum (EDS) and X-ray diffraction (XRD). The results indicate that ultrasonic vibration does not alter two constituents of the composites, but changes the size and distribution of aggregated primary Mg2Si particles. The size of primary Mg2Si particles decreases with the increase of vibration duration and vibrating temperature. High intensity ultrasonic has little effects on the primary Mg2Si morphology. The high intensity ultrasonic vibration is an effective means to prepare well-proportioned in-situ synthesized magnesium matrix composites.

 

Key words: Mg2Si/Mg composite; high intensity ultrasonic vibration; in-situ synthesis; microstructure; primary Mg2Si

ISSN 1672-7029
CN 43-1423/U

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