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Stability of Phase Transformation Temperatures During Cycling of Ti-15.8Nb-4.94Al-0.06Sc Shape Memory Alloy

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Abstract

The active ω phase formation decreases the martensitic transformation temperatures sharply and can even suppress the martensitic transformation during thermal cycling in Ti-Nb-based alloys. No ω phase is observed in the present Ti-15.8Nb-4.94Al-0.06Sc alloy when it is annealed at 650 °C for 4 h or subsequently aged at 200 and 250 °C for 2 h. The exclusion of ω phase remarkably improves the stability of phase transformation temperatures during thermal cycling. The martensitic transformation start temperature of the present alloy decreases by 30 °C but tends to be stable gradually during the 20 thermal cycles, owing to the saturation of lattice defects.

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Acknowledgments

The work was supported by National Natural Science Foundation of China (No. 51571073) and State Key Lab of Advanced Metals and Materials (2015-Z01).

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Correspondence to X. L. Meng.

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Sun, B., Meng, X.L., Gao, Z.Y. et al. Stability of Phase Transformation Temperatures During Cycling of Ti-15.8Nb-4.94Al-0.06Sc Shape Memory Alloy. J. of Materi Eng and Perform 27, 6479–6484 (2018). https://doi.org/10.1007/s11665-018-3775-y

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  • DOI: https://doi.org/10.1007/s11665-018-3775-y

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