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Microstructure and Phase Transformation in Ti-22Al-(27-x)Nb-xZr Alloys During Continuous Heating

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Abstract

Phase transformation during heating in homogenized Ti-22Al-(27-x)Nb-xZr (x = 0, 1, 6) alloys is monitored by dilatometry, differential scanning calorimetry (DSC), and detailed metallographic examination. Moreover, the dissolution of α2 into the B 2/β matrix is investigated and discussed. In Ti-22Al-27Nb alloy, the sequence of phase transformation during heating can be concluded as follows: B 2/β → O, B 2/β + α2 → O, B 2/β + O→B 2/β + O + α2, B 2/β + O + α2 → B 2/β + α2, and B 2/β + α2 → B 2/β. For Ti-22Al-21Nb-6Zr alloy, it is B 2/β → α2 + O, O + α2 + B 2/β → B 2/β + α2, and then α2 dissolves into B 2 matrix. There are considerable shifts in the maxima of the transformation rates in B 2/β + O+α2 → B 2/β + α2 and B 2/β + α2 → B 2/β transformed region to the higher temperatures with increasing x value. In the stage of B 2/β + α2 → B 2/β, there is a deceleration of reduction in α2 phase with increasing temperature for Ti-22Al-(27-x)Nb-xZr (x = 0, 1, 6) alloys. And for Ti-22Al-21Nb-6Zr, the dissolution rate of α2 phase is accelerated.

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Acknowledgment

The authors thank the financial supports from the National Basic Research Program of China (2011CB605503).

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072, X’ian, China

    Wei Dang, Jinshan Li, Tiebang Zhang & Hongchao Kou

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  1. Wei Dang
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Correspondence to Tiebang Zhang.

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Dang, W., Li, J., Zhang, T. et al. Microstructure and Phase Transformation in Ti-22Al-(27-x)Nb-xZr Alloys During Continuous Heating. J. of Materi Eng and Perform 24, 3951–3957 (2015). https://doi.org/10.1007/s11665-015-1659-y

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  • DOI: https://doi.org/10.1007/s11665-015-1659-y

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