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. Issue 14 (28th July 2020)

• Record Type: Journal Article
• Authors: da Silva, Murillo R.; Gargarella, Piter; Plaine, Athos H.; Contieri, Rodrigo J.; Pauly, Simon; Kühn, Uta; Bolfarini, Claudemiro
• Is Part Of: Journal of materials research. Volume 35:Issue 14(2020)
• Page Start: 1777
• Page End: 1789
• Publication Date: 2020-07-28
• Subjects: β-Ti alloys, -- Gum Metal, -- oxygen, -- in situ compression tests, -- synchrotron, -- martensitic transformation; Materials -- Research -- Periodicals; 620.1105
• DOI: 10.1557/jmr.2020.150
• Languages: English
• ISSNs: 0884-2914

Abstract

Abstract: Abstract : In this work, a Ti–29Nb–13Ta–4.6Zr– x O 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.