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闫洪,孙勇辉,陈小会,万骏,喻保标.超声振动法制备半固态TiAl3/A356复合材料浆料的微观组织演变[J].稀有金属材料与工程(英文),2019,48(1):24~32.[YAN Hong,SUN Yonghui,CHEN Xiaohui,WAN June and 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.]
Microstructure evolution of semi-solid TiAl3/A356 composite prepared by ultrasonic vibration
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Received:August 16, 2017  Revised:December 05, 2017
DOI:
Key words: microstructure  semi-solid  aluminum matrix composite  ultrasonic vibration  primary α-Al particles
Foundation item:国家自然科学基金
Author NameAffiliation
YAN Hong,SUN Yonghui,CHEN Xiaohui,WAN June and YU Baobiao  
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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.