Abstract
In this work, a Ti–29Nb–13Ta–4.6Zr–xO Gum Metal with two significantly different oxygen levels (388 and 3570 ppm) was investigated during deformation. The alloys were compressed during in situ high-energy X-ray diffraction using three different strain rates, 10−4, 10−3, and 10−1 s−1, in order to evaluate their influence on phase stability and mechanical properties. The influence of oxygen on the deformation process was also studied. Deformation takes place by twinning, stress-induced, and reverse martensitic transformation and was observed, for some samples, a spinodal decomposition of the β-phase during elastic deformation. The mechanical properties were similar for the different rates employed when considering the same oxygen level. The alloy with a higher amount of oxygen, however, showed a substantial increase in mechanical strength, with a yield strength of around 680 MPa, which is more than three times higher than for the specimen with 388 ppm of oxygen.
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Acknowledgments
The authors are grateful to the National Center for Research in Energy and Materials (CNPEM) for allowing the use of their facilities and to Mr. Leonardo Wu for technical assistance. The financial support granted by CAPES (Coordination for the Improvement of Higher Education Personnel) (Grant No. 88882.332706/2018-01) and under the program BRAGECRIM (Process No. 88887.198933/2018-00) in collaboration with DFG (German Research Foundation), as well as by FAPESP (São Paulo Research Foundation) (Grant No. 2013/05987-8) are acknowledged. S.P. acknowledges financial support by DFG under Grant No. PA 2275/6-1.
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da Silva, M.R., Gargarella, P., Plaine, A.H. et al. Influence of the deformation rate on phase stability and mechanical properties of a Ti–29Nb–13Ta–4.6Zr–xO alloy analyzed by in situ high-energy X-ray diffraction during compression tests. Journal of Materials Research 35, 1777–1789 (2020). https://doi.org/10.1557/jmr.2020.150
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DOI: https://doi.org/10.1557/jmr.2020.150