The effect of large-area pulsed electron beam melting on the corrosion and microstructure of a Ti6Al4V alloy
The effect of large-area pulsed electron beam melting on the corrosion and microstructure of a Ti6Al4V alloy
The use of titanium alloys in biomedical applications continues to increase due to the excellent stiffness to weight ratio and high corrosion resistance. In order to improve the surface wettability and corrosion properties of a Ti-6Al-4V alloy, the surface treatment method, large area electron beam melting technique was investigated. Polished samples were subject to pulsed treatments of 1, 15 and 25 at 1.38 J/cm2 beam energy. Surface roughness and contact wetting angles were reduced as a result of the treatment. Microstructural analysis of the surface by XRD and FIB-TEM revealed a martensitic alpha prime phase formed as a result of the high cooling rates induced by the treatment. The presence of this homogenous martensite layer was shown to facilitate a compact passive oxide layer formation during corrosion, thus improving corrosion rates by several orders of magnitude compared to an untreated sample. Large area electron beam melting of Ti-6Al-4V induced a number of changes to the near surface microstructure of the samples, all of which could be used to tailor mechanical and corrosion properties to that of a desired application, without compromising the bulk material properties. These are explored in detail in this work.
534-540
Walker, J.C.
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Murray, J.W.
3985aa41-1e0e-4504-ab90-e31a00c33c38
Nie, Mengyan
a8613738-d74a-40fb-8881-08069fb0a34b
Cook, R.B.
06f8322d-81be-4f82-9326-19e55541c78f
Clare, A.T.
07b7d19d-56e4-4a3d-9be8-0a7446257fa4
30 August 2014
Walker, J.C.
b300eafd-5b0a-4cf5-86d2-735813b04c6f
Murray, J.W.
3985aa41-1e0e-4504-ab90-e31a00c33c38
Nie, Mengyan
a8613738-d74a-40fb-8881-08069fb0a34b
Cook, R.B.
06f8322d-81be-4f82-9326-19e55541c78f
Clare, A.T.
07b7d19d-56e4-4a3d-9be8-0a7446257fa4
Walker, J.C., Murray, J.W., Nie, Mengyan, Cook, R.B. and Clare, A.T.
(2014)
The effect of large-area pulsed electron beam melting on the corrosion and microstructure of a Ti6Al4V alloy.
Applied Surface Science, 311, .
(doi:10.1016/j.apsusc.2014.05.105).
Abstract
The use of titanium alloys in biomedical applications continues to increase due to the excellent stiffness to weight ratio and high corrosion resistance. In order to improve the surface wettability and corrosion properties of a Ti-6Al-4V alloy, the surface treatment method, large area electron beam melting technique was investigated. Polished samples were subject to pulsed treatments of 1, 15 and 25 at 1.38 J/cm2 beam energy. Surface roughness and contact wetting angles were reduced as a result of the treatment. Microstructural analysis of the surface by XRD and FIB-TEM revealed a martensitic alpha prime phase formed as a result of the high cooling rates induced by the treatment. The presence of this homogenous martensite layer was shown to facilitate a compact passive oxide layer formation during corrosion, thus improving corrosion rates by several orders of magnitude compared to an untreated sample. Large area electron beam melting of Ti-6Al-4V induced a number of changes to the near surface microstructure of the samples, all of which could be used to tailor mechanical and corrosion properties to that of a desired application, without compromising the bulk material properties. These are explored in detail in this work.
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Accepted/In Press date: 16 May 2014
e-pub ahead of print date: 26 May 2014
Published date: 30 August 2014
Organisations:
nCATS Group
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Local EPrints ID: 365323
URI: http://eprints.soton.ac.uk/id/eprint/365323
ISSN: 0169-4332
PURE UUID: c306267c-b1c6-491f-8680-fe23064124ad
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Date deposited: 02 Jun 2014 11:06
Last modified: 15 Mar 2024 03:34
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Author:
J.W. Murray
Author:
Mengyan Nie
Author:
A.T. Clare
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