Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments

Li Ying; Tian Shuxia; Fan Jianglei; Wang Yan; Liu Jianxiu

doi:10.7513/j.issn.1004-7638.2022.05.009

Volume 43 Issue 5

Nov. 2022

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Li Ying, Tian Shuxia, Fan Jianglei, Wang Yan, Liu Jianxiu. Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 59-64. doi: 10.7513/j.issn.1004-7638.2022.05.009

Citation:

Li Ying, Tian Shuxia, Fan Jianglei, Wang Yan, Liu Jianxiu. Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(5): 59-64. doi: 10.7513/j.issn.1004-7638.2022.05.009

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Phase transformation kinetics of high Nb-TiAl alloy during isothermal treatments

doi: 10.7513/j.issn.1004-7638.2022.05.009

Institute of Mechanical and Electrical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450002, Henan, China

Received Date: 2022-03-31
Publish Date: 2022-11-01

Abstract

Abstract

The isothermal phase transformation kinetics of α₂→α at the temperature 1140−1200 ℃ in high Nb-TiAl alloy were systematically studied by in-situ thermal expansion method. The results show that during the α₂→α isothermal phase transformation of high Nb-TiAl alloy, the “nose tip” temperature of α₂→α phase transformation is 1170 ℃, and the formation of α phase presents an “S” curve. Based on the thermal expansion curve, the corresponding JMA isothermal phase transformation kinetics equation during the isothermal process was obtained. On the basis of the JMA equation, the Avrami exponent n and temperature constant K of isothermal phase transformation of high Nb-TiAl alloy were obtained by logarithmic fitting the fractional time curve of phase transformation. Based on the results of thermal expansion measurement, the time-temperature-transformation diagram (TTT diagram) was plotted for high Nb-TiAl alloy. The phase transformation kinetics mechanism of high Nb-TiAl alloy controlled by diffusion was revealed.
- high Nb-TiAl alloy,
- in-situ thermal expansion,
- isothermal phase transformation,
- kinetics

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References(12)

References

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