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The critical pressure and impeding pressure of Al evaporation during induction skull melting processing of TiAl

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Abstract

In this article, two key pressures, the critical pressure P crit and the impeding pressure P impe of elemental evaporation, are defined and studied based on the calculation relationship between the evaporation loss rate N m and the chamber pressure P during melting of titanium-aluminum alloys. When the chamber pressure is below P crit or above P impe, N m tends to the maximum or the minimum value and remains almost unchanged. However, if P crit<P<P impe, with the increase of the chamber pressure, N m declines sharply. A method has been put forward to calculate P crit and P impe of Al evaporation in a Ti-XAl (at pct) (X=25 to 50) melt. The calculation result shows that P crit or P impe is a second-order function of the molar percentage of Al and the melt temperature.

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Authors and Affiliations

  1. the School of Materials Science and Engineering, Harbin Institute of Technology, 150001, Harbin, People’s Republic of China

    Jingjie Guo (Professor), Jun Jia (Professor), Hengzhi Fu (Professor), Guizhong Liu (Postdoctoral Candidate), Yanqing Su (Associate Professor) & Hongsheng Ding (Associate Professor)

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  1. Jingjie Guo
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  2. Jun Jia
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  3. Hengzhi Fu
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  4. Guizhong Liu
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  5. Yanqing Su
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  6. Hongsheng Ding
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Guo, J., Jia, J., Fu, H. et al. The critical pressure and impeding pressure of Al evaporation during induction skull melting processing of TiAl. Metall Mater Trans A 33, 3249–3253 (2002). https://doi.org/10.1007/s11661-002-0311-2

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  • DOI: https://doi.org/10.1007/s11661-002-0311-2

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