Zhang, W., Ding, H., Pereira, P.H.R., Huang, Y. and Langdon, T.G., 2018. Grain refinement and superplastic flow in a fully lamellar Ti-6Al-4V alloy processed by high-pressure torsion. Materials Science and Engineering: A, 732 (August), 398 - 405.
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DOI: 10.1016/j.msea.2018.07.010
Abstract
A cold-rolled Ti-6Al-4V alloy was subjected to consecutive heat treatments at 1283 K for 1 h and at 823 K for 3 h in order to produce a fully lamellar microstructure. Thereafter, the material was processed by high-pressure torsion (HPT) through various numbers of turns up to a maximum of 30. It is shown that the HPT processing leads to exceptional grain refinement with average grain sizes of ~ 70 and ~ 50 nm after 20 and 30 turns, respectively. Tensile testing was conducted at 873 and 923 K with different initial strain rates using the material processed through 20 turns of HPT and this gave a maximum superplastic elongation of 820% at the relatively low temperature of 923 K when testing with an initial strain rate of 5.0 × 10−4s−1. The associated strain rate sensitivity for this low temperature superplasticity was estimated as m ≈ 0.5 which is consistent with flow by grain boundary sliding.
Item Type: | Article |
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ISSN: | 0921-5093 |
Uncontrolled Keywords: | Grain boundary sliding; Grain refinement; High-pressure torsion; Phase transformation; Superplasticity; Ti-6Al-4V alloy |
Group: | Faculty of Science & Technology |
ID Code: | 31195 |
Deposited By: | Symplectic RT2 |
Deposited On: | 04 Sep 2018 08:00 |
Last Modified: | 14 Mar 2022 14:12 |
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