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Ti/Al固相擴(kuò)散反應(yīng)行為表征及動(dòng)力學(xué)研究
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哈爾濱工業(yè)大學(xué)金屬精密熱加工國(guó)家重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)金屬精密熱加工國(guó)家重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)金屬精密熱加工國(guó)家重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)金屬精密熱加工國(guó)家重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué)金屬精密熱加工國(guó)家重點(diǎn)實(shí)驗(yàn)室

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國(guó)家國(guó)際科技合作專項(xiàng)（2013DFR50090）；陜西省自然科學(xué)基金項(xiàng)目（2014JM6222）


Characterization on the solid phase diffusion reaction behavior and diffusion reaction kinetic of Ti/Al
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National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology

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    摘要:

    本研究在Ti和Al均過量時(shí)，表征了Ti/Al在520℃~630℃范圍內(nèi)不同時(shí)間下的固相擴(kuò)散反應(yīng)行為。結(jié)果發(fā)現(xiàn)，當(dāng)試樣退火46小時(shí)后，Ti/Al界面的反應(yīng)產(chǎn)物為單一相TiAl3，而且TiAl3/Al界面上的TiAl3生長(zhǎng)速度比Ti/TiAl3界面上的TiAl3生長(zhǎng)速度快。此外，本研究建立了TiAl3生長(zhǎng)動(dòng)力學(xué)模型，Ti/Al擴(kuò)散反應(yīng)激活能為170.1 kJ/mol，動(dòng)力學(xué)指數(shù)為n=0.5，TiAl3生長(zhǎng)隨時(shí)間呈拋物線規(guī)律增長(zhǎng)，利用Ti/Al復(fù)合粉末體作為試驗(yàn)材料，證明了所建立的TiAl3生長(zhǎng)動(dòng)力學(xué)方程的正確性。

    Abstract:

    In this paper, the solid phase diffusion reaction behavior between Ti and Al is characterized from 520 to 630℃ at different annealing time with titanium and aluminum being superfluous. In the samples annealed up to 46h, only intermeallic TiAl3 phase forms and grows at the Ti/Al interface. It was found that the growth rate of TiAl3 towards TiAl3/Al interface is more rapid than that towards the Ti/TiAl3 interface. Additionally, the solid-state diffusion reaction kinetic equation of TiAl3 is successfully established in the present work. The reaction activation energy of Ti/Al is calculated to be 170.1 kJ·mol-1 and dynamic index n is 0.5. Hence, the growth of TiAl3 is controlled by normal parabolic law with annealing time. Ti/Al powder compact is employed as experiment material to identify the proposed reaction kinetic equation for the growth of TiAl3. It is suggested that no extra aluminum was found in the specimen annealed at 590℃/4.5h, and the aluminum is still found at 590℃/3.5h, indicating that is in a good agreement with the developed solid-phase diffusion reaction equation.

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孫宇,萬志鵬,胡連喜,吳兵華,鄧太慶. Ti/Al固相擴(kuò)散反應(yīng)行為表征及動(dòng)力學(xué)研究[J].稀有金屬材料與工程,2017,46(8):2080~2086.[Y. Sun, Z. P. Wan, L. X. Hu, B. H. Wu, T. Q. Deng. Characterization on the solid phase diffusion reaction behavior and diffusion reaction kinetic of Ti/Al[J]. Rare Metal Materials and Engineering,2017,46(8):2080~2086.]
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  • 收稿日期:2015-08-20
  • 最后修改日期:2016-02-14
  • 錄用日期:2016-03-29
  • 在線發(fā)布日期: 2017-11-16
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