Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion

Xu, Wei, Wu, Xiaolin, Figueiredo, Roberto B., Stoica, Mihai, Calin, Mariana, Eckert, Jurgen, Langdon, Terence G. and Xia, Kenong (2013) Nanocrystalline body-centred cubic beta-titanium alloy processed by high-pressure torsion. International Journal of Materials Research, 100 (12), 1662-1667. (doi:10.3139/146.110229).

Abstract

Processing by high-pressure torsion at room temperature was employed to achieve a uniform nanostructure in a metastable Ti67.4Nb24.6Zr5Sn3 bcc ? alloy with grains of ?20–60 nm after five turns. By comparison, there was an ultrafine grain structure after equal-channel angular pressing at 903 K. The majority of refined grains were identified as bcc ?-titanium with the presence of a small fraction of orthorhombic ?? martensite. It is proposed that the pronounced grain refinement is facilitated by a stress-/strain-induced ? ? ?? martensitic transformation. However, the presence of a large fraction of ? phase in the high-pressure torsion processed samples is attributed to a reverse ?? ? ? martensitic transformation stimulated by the applied shear stress and the inhibition effect of the nanoscale grains on martensite formation

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Contributors

Author: Terence G. Langdon

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