Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (5): 638-642.DOI: 10.12068/j.issn.1005-3026.2018.05.007

• Materials & Metallurgy • Previous Articles     Next Articles

Thermodynamics and Dynamics of Ti-6Al-4V Alloy Preparation by Thermite Reduction

CHENG Chu1,2, DOU Zhi-he1,2, ZHANG Ting-an1,2, YI Xin1,2   

  1. 1. School of Metallurgy, Northeastern University, Shenyang 110819, China; 2. Key Laboratory for Ecological Utilization of Multimetallic Mineral
  • Received:2016-12-23 Revised:2016-12-23 Online:2018-05-15 Published:2018-05-25
  • Contact: ZHANG Ting-an
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Abstract: The thermodynamics and dynamics of Al-TiO2, Al-V2O5, Al-V2O5-TiO2, Al-V2O5-TiO2-CaO systems were studied. The results indicate that the method for preparing Ti-6Al-4V alloy by reducing TiO2 and V2O5 with Al powder is feasible. The addition of CaO can decrease the reaction heat per unit mass of the system, therefore, it requires the heat supplement to maintain the reaction. It is found that the reaction of TiO2 reduced by Al for preparing Ti-6Al-4V alloy occurs at 951℃, where the apparent activation energy is 166.47kJ/mol and the reaction order is 0.3982, and the reaction of V2O5 reduced by Al occurs at 946℃, where the apparent activation energy is 392.72kJ/mol and the reaction order is 1.0618. It is also shown that the reaction of TiO2 and V2O5 reduced by Al occurs at 1019℃, where the apparent activation energy is 173.56kJ/mol and the reaction order is 0.4722, while after the addition of CaO, the reaction can occur at 979℃, associated with a higher apparent activation energy and lower reaction order. All the four reactions belong to the liquid-solid reactions.

Key words: Ti-6Al-4V alloy, thermite reduction, direct preparation, thermodynamics, dynamics

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