Influence of high intensity ultrasonic vibration on microstructure of in-situ synthesized Mg2Si/Mg composites

• Published in: Transactions of Nonferrous Metals Society of China Vol. 17; no. A01; pp. 391 - 395
• Main Author: 陈可 李子全 周衡志 王伟
• Format: Journal Article
• Language: English
• Published: 01.11.2007
• Subjects: 超声波振动; 镁化合物
• ISSN: 1003-6326

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.