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超聲振動(dòng)法制備半固態(tài)TiAl3/A356復(fù)合材料漿料的微觀組織演變
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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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國家自然科學(xué)基金


Microstructure evolution of semi-solid TiAl3/A356 composite prepared by ultrasonic vibration
Author:
Affiliation:

1.Department of Materials Processing Engineering,School of Mechanical and Electrical Engineering,Nanchang University;2.School of Mechanical and Electrical Engineering, Xinyu University, Xinyu,

Fund Project:

National Natural Science Foundation of China

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    摘要:

    本文利用超聲振動(dòng)法制備半固態(tài)TiAl3/A356鋁基復(fù)合材料漿料，利用掃描電鏡和X射線衍射技術(shù)研究了超聲溫度，超聲時(shí)間和超聲功率對(duì)半固態(tài)TiAl3/A356鋁基復(fù)合材料漿料的微觀組織的影響。結(jié)果顯示，初生α-Al顆粒的尺寸隨著超聲溫度和超聲功率的降低而減??；而隨著超聲時(shí)間的增加，先減小后增大。當(dāng)超聲溫度為608 ℃、超聲功率為1000 W、超聲時(shí)間為60 s時(shí)，獲得的半固態(tài)漿料組織中的初生α-Al顆粒形貌較為理想，平均初生α-Al顆粒尺寸為62 μm，形狀系數(shù)為0.8。微觀組織演變的機(jī)理是空化效應(yīng)和聲流效應(yīng)引起的形核率和過冷度的增加。此外，原位生成的TiAl3顆粒有很強(qiáng)的結(jié)合α-Al顆粒的能力。

    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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引用本文

閆洪,孫勇輝,陳小會(huì),萬駿,喻保標(biāo).超聲振動(dòng)法制備半固態(tài)TiAl3/A356復(fù)合材料漿料的微觀組織演變[J].稀有金屬材料與工程,2019,48(1):24~32.[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.]
DOI：10.12442/j. issn.1002-185X.20170730

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  • 收稿日期:2017-08-16
  • 最后修改日期:2017-12-05
  • 錄用日期:2017-12-13
  • 在線發(fā)布日期: 2019-02-18
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