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Microstructure evolution of Ti-47Al-2Cr-2Nb alloy in the liquid-metal-cooling (LMC) directional-solidification process

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Abstract

The microstructure evolution of Ti-47Al-2Cr-2Nb alloy was investigated on liquid metal cooling type directional solidified apparatus at high temperature gradient. The analysis shows that it is solidified with primary β cells/dendrites, and then α phase is formed through peritectic reaction. Once the columnar grains grow into the steady state, the lamellar orientation inclined with the angle of 45° to the withdrawal direction is more favored than that with parallel to the withdrawal direction. In addition, α phase grain nucleates from β-interdendrite regions, and grows up to the dendritic trunk. If no other α grain hinders its growth, it would occupy the whole dendrite, or it would stop at the dendritic trunk for the weakened motivating drive in the β dendritic core.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics(BUAA), Beijing, 100191, China

    Zhixia Xiao  (肖志霞), Lijing Zheng, Lei Wang, Lili Yang & Hu Zhang  (张虎)

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  1. Zhixia Xiao  (肖志霞)
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  2. Lijing Zheng
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  3. Lei Wang
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  4. Lili Yang
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  5. Hu Zhang  (张虎)
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Correspondence to Hu Zhang  (张虎).

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Xiao, Z., Zheng, L., Wang, L. et al. Microstructure evolution of Ti-47Al-2Cr-2Nb alloy in the liquid-metal-cooling (LMC) directional-solidification process. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 26, 197–201 (2011). https://doi.org/10.1007/s11595-011-0196-2

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  • DOI: https://doi.org/10.1007/s11595-011-0196-2

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