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Microstructure evolution of semi-solid TiAl3/A356 composite prepared by ultrasonic vibration
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1.Department of Materials Processing Engineering,School of Mechanical and Electrical Engineering,Nanchang University;2.School of Mechanical and Electrical Engineering, Xinyu University, Xinyu,

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National Natural Science Foundation of China

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    Abstract:

    The semi-solid TiAl3/A356 aluminum composite was prepared by ultrasonic vibration treatment(UVT). The effects of UVT temperature, time and power on the microstructure of semi-solid slurry of TiAl3/A356 composite were studied by using SEM and X-ray diffraction techniques. The results revealed that the size of primary α-Al particles increased with the decrease of UVT temperature and power. The size of primary α-Al particles decreased at first and then increased with the increase of UVT time. When treated for 60s at an UVT temperature of 608 ℃ and an UVT power of 1KW, a good primary α-Al particle morphology with an average size of 62 μm and a shape coefficient of 0.8 could be obtained. The mechanism involved in the development of microstructure is the result of increase of nucleation rate and undercooling caused by a cavitation and acoustic streaming. Furthermore, the in situ TiAl3 particles have strong ability to nucleate α-Al particles.

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[YAN Hong, SUN Yonghui, CHEN Xiaohui, WAN June, YU Baobiao. Microstructure evolution of semi-solid TiAl3/A356 composite prepared by ultrasonic vibration[J]. Rare Metal Materials and Engineering,2019,48(1):24~32.]
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History
  • Received:August 16,2017
  • Revised:December 05,2017
  • Adopted:December 13,2017
  • Online: February 18,2019
  • Published: