Abstract
This paper reported an effectiveness of pre-cold rolling-induced {332} < 113 > twins combined with subsequent isothermal ω-phase formation for enhancement of uniform elongation in a β-type Ti–15Mo alloy with high yield strength level. Mechanical {332} < 113 > twins were induced by cold rolling with an thickness reduction of 5%, which had little effect on ω-phase precipitation after aging at 573 K for 3.6 ks. Twinning after the cold rolling was further activated during tensile deformation, even with the presence of isothermal ω-phase. This combination of twins and ω-phase enhanced uniform elongation from 0 to 9% at yield strength level of 890 MPa. The high yield strength was mainly dominated by dislocation slip due to the isothermal ω-phase formation, and early onset of plastic instability after yielding was hindered due to the pre-cold rolling-induced twins. Dynamic microstructural refinement was induced by further twinning activation during deformation, which resulted in high work hardening rate corresponding enhancement of uniform elongation.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (Grant No. 51471040). The authors would like to thank Prof. J. Zhao and Mr. S.H. Xue of Dalian University of Technology for their assistance.
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Xiang, L., Min, XH., Ji, X. et al. Effect of Pre-cold Rolling-Induced Twins and Subsequent Precipitated ω-Phase on Mechanical Properties in a β-Type Ti–Mo Alloy. Acta Metall. Sin. (Engl. Lett.) 31, 604–614 (2018). https://doi.org/10.1007/s40195-017-0687-z
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DOI: https://doi.org/10.1007/s40195-017-0687-z