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Factors influencing superplasticity in the Ti-6Al-4V alloy processed by high-pressure torsion

Factors influencing superplasticity in the Ti-6Al-4V alloy processed by high-pressure torsion
Factors influencing superplasticity in the Ti-6Al-4V alloy processed by high-pressure torsion
Two different initial microstructures, martensitic and lamellar, were developed in a Ti-6Al-4V alloy to examine their effect on the high temperature mechanical properties and superplasticity after high-pressure torsion (HPT). Significant grain refinement was achieved in both conditions with grain sizes after HPT processing of ~30 and ~40 nm, respectively. The nanocrystalline alloy in both conditions was subjected to mechanical testing at 923-1073 K with strain rates in the range from 10-3 to 10-1 s-1. The martensitic and lamellar alloys exhibited excellent ductility at these high temperatures including superplastic elongations at 973 K with maximum elongations of 815% and 690%, respectively. The fcc phase was stable at elevated temperatures in the martensitic alloy and the results suggests the fcc phase may contribute to the superior superplastic properties of the martensitic alloy.
0921-5093
198-206
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Naghdi, Fariba
a04bcf7e-209f-4e03-8a28-a68512903cd3
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Shahmir, Hamed
9d330616-d35d-4db0-96e8-26195ae1c511
Naghdi, Fariba
a04bcf7e-209f-4e03-8a28-a68512903cd3
Pereira, Pedro H.R.
9ee129fd-0e06-482d-990c-971aaf83b1d0
Huang, Yi
9f4df815-51c1-4ee8-ad63-a92bf997103e
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Shahmir, Hamed, Naghdi, Fariba, Pereira, Pedro H.R., Huang, Yi and Langdon, Terence G. (2018) Factors influencing superplasticity in the Ti-6Al-4V alloy processed by high-pressure torsion. Materials Science and Engineering: A, 718, 198-206. (doi:10.1016/j.msea.2018.01.091).

Record type: Article

Abstract

Two different initial microstructures, martensitic and lamellar, were developed in a Ti-6Al-4V alloy to examine their effect on the high temperature mechanical properties and superplasticity after high-pressure torsion (HPT). Significant grain refinement was achieved in both conditions with grain sizes after HPT processing of ~30 and ~40 nm, respectively. The nanocrystalline alloy in both conditions was subjected to mechanical testing at 923-1073 K with strain rates in the range from 10-3 to 10-1 s-1. The martensitic and lamellar alloys exhibited excellent ductility at these high temperatures including superplastic elongations at 973 K with maximum elongations of 815% and 690%, respectively. The fcc phase was stable at elevated temperatures in the martensitic alloy and the results suggests the fcc phase may contribute to the superior superplastic properties of the martensitic alloy.

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Accepted/In Press date: 22 January 2018
e-pub ahead of print date: 28 February 2018
Published date: 7 March 2018

Identifiers

Local EPrints ID: 417698
URI: http://eprints.soton.ac.uk/id/eprint/417698
ISSN: 0921-5093
PURE UUID: 89618025-8ac6-44b9-9602-7b5aeedb0fb4
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: 12 Feb 2018 17:30
Last modified: 16 Mar 2024 06:11

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Contributors

Author: Hamed Shahmir
Author: Fariba Naghdi
Author: Pedro H.R. Pereira
Author: Yi Huang ORCID iD

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