Abstract
Metastable phase diagrams of β (BCC)-Ti high-temperature shape memory alloys (HTSMAs) have been investigated extensively, where however β→isothermal ω (iso-ω, hexagonal) transition upon heating has not been accessed. Following α” (orthorhombic)→β reverse martensitic transformation on heating, iso-ω precipitation is commonly encountered. These two transitions may overlap within certain composition range, but have not been clearly differentiated. It is of vital importance for the understanding of the subsequent transition behaviors. In this paper, phase transformations upon heating at various heating rates were characterized in quenched Ti-(16–25 at.%)Nb HTSMAs. In contrast to the linear increase in As (the starting temperature of α”→β transition) with decreasing Nb-content, ωs (the starting temperature of β→iso-ω transition) exhibits normal decrease firstly and shows abnormal increase below 20Nb. It is because iso-ω precipitates only in the reversed β phase but not in α” martensite proved by transmission electron microscopy observations. Namely, β→iso-ω transition is postponed to higher temperature due to the suppression of α” martensite below 20Nb. On this basis, the characteristics of both transformations can be determined for Ti-Nb below 20Nb by proper peak deconvolution. New metastable phase diagrams of Ti-Nb are formulated, including both α”→β and β→iso-ω transitions upon heating. Moreover, effective activation energies for β→iso-ω transition during isochronal annealing are determined by the Kissinger method.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China [grant number 2016YFB0701302] and National Natural Science Foundation of China [grant numbers 51621063, 51831006, 51931004, 51501145]. We thank Dr. Guo Shengwu, Dr. Zhu Ruihua, Dr. Zhou Shanlin, Dr. Wang Wei, Dr. Ren Zijun and Dr. Huang Chang for their kind assistances during experiments.
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Zhang, J., Li, Y. & Li, W. Metastable phase diagram on heating in quenched Ti-Nb high-temperature shape memory alloys. J Mater Sci 56, 11456–11468 (2021). https://doi.org/10.1007/s10853-021-05814-4
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DOI: https://doi.org/10.1007/s10853-021-05814-4