Zhang, Wenjing, Ding, Hua, Pereira, Pedro H.R., Huang, Yi and Langdon, Terence 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, 398-405. (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 × 10−4 s−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.
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- Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Mechanical Engineering
Mechanical Engineering - Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Mechanical Engineering (pre 2018 reorg) > Engineering Mats & Surface Engineerg Gp (pre 2018 reorg)
Current Faculties > Faculty of Engineering and Physical Sciences > School of Engineering > Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) > Engineering Mats & Surface Engineerg Gp (pre 2018 reorg)
Mechanical Engineering > Mechanical Engineering (pre 2018 reorg) > Engineering Mats & Surface Engineerg Gp (pre 2018 reorg) - Faculties (pre 2018 reorg) > Faculty of Engineering and the Environment (pre 2018 reorg) > Education Hub (pre 2018 reorg)
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