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Grain refinement and superplastic flow in a fully lamellar Ti-6Al-4V alloy processed by high-pressure torsion

Grain refinement and superplastic flow in a fully lamellar Ti-6Al-4V alloy processed by high-pressure torsion
Grain refinement and superplastic flow in a fully lamellar Ti-6Al-4V alloy processed by high-pressure torsion
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.
0921-5093
398-405
Zhang, Wenjing
12fcd50c-70ed-4798-a330-7695cc6d7214
Ding, Hua
e5e79ad8-7d12-4222-a212-284f96d4f0fc
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhang, Wenjing
12fcd50c-70ed-4798-a330-7695cc6d7214
Ding, Hua
e5e79ad8-7d12-4222-a212-284f96d4f0fc
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

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).

Record type: Article

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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Hua-Ti64 paper-final_revised-TGL - Accepted Manuscript
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Accepted/In Press date: 3 July 2018
e-pub ahead of print date: 4 July 2018
Published date: 8 August 2018

Identifiers

Local EPrints ID: 422184
URI: http://eprints.soton.ac.uk/id/eprint/422184
ISSN: 0921-5093
PURE UUID: 555e8688-4625-4723-ae6f-755675e4d063
ORCID for Yi Huang: ORCID iD orcid.org/0000-0001-9259-8123
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 18 Jul 2018 16:30
Last modified: 17 Dec 2019 05:20

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Contributors

Author: Wenjing Zhang
Author: Hua Ding
Author: Pedro H.R. Pereira
Author: Yi Huang ORCID iD

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