Influence of phase volume fractions on the processing of a Ti–6Al–4V alloy by high-pressure torsion
Influence of phase volume fractions on the processing of a Ti–6Al–4V alloy by high-pressure torsion
Using appropriate heat treatments, different volume fractions of the constituent phases were produced in a Ti–6Al–4V alloy. Thus, in Ti64-1 there was ?85% of an equiaxed ?-phase and ?15% of a lamellar (?+?) microstructure and in Ti64-2 there was ?48% of the ?-phase and ?52% of the (?+?) microstructure. These two alloys were processed by high-pressure torsion (HPT) at room temperature under an applied pressure of 6.0 GPa. Both materials showed increases in the microhardness and decreases in the grain size after HPT with a stabilization after about 10 turns. Higher hardness values and smaller grain sizes were attained in Ti64-2 thereby demonstrating that greater grain refinement is achieved when processing an alloy with approximately equal volume fractions of the constituent phases. In these experiments, the measured equilibrium grain sizes after 20 turns of HPT were ?130 nm in Ti64-1 and ?70 nm in Ti64-2.
861-867
Wang, Ying Chun
5c067a6f-de5d-4fcb-9b0d-80a42c3634b0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
1 January 2013
Wang, Ying Chun
5c067a6f-de5d-4fcb-9b0d-80a42c3634b0
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Wang, Ying Chun and Langdon, Terence G.
(2013)
Influence of phase volume fractions on the processing of a Ti–6Al–4V alloy by high-pressure torsion.
Materials Science and Engineering: A, 559, .
(doi:10.1016/j.msea.2012.09.034).
Abstract
Using appropriate heat treatments, different volume fractions of the constituent phases were produced in a Ti–6Al–4V alloy. Thus, in Ti64-1 there was ?85% of an equiaxed ?-phase and ?15% of a lamellar (?+?) microstructure and in Ti64-2 there was ?48% of the ?-phase and ?52% of the (?+?) microstructure. These two alloys were processed by high-pressure torsion (HPT) at room temperature under an applied pressure of 6.0 GPa. Both materials showed increases in the microhardness and decreases in the grain size after HPT with a stabilization after about 10 turns. Higher hardness values and smaller grain sizes were attained in Ti64-2 thereby demonstrating that greater grain refinement is achieved when processing an alloy with approximately equal volume fractions of the constituent phases. In these experiments, the measured equilibrium grain sizes after 20 turns of HPT were ?130 nm in Ti64-1 and ?70 nm in Ti64-2.
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Published date: 1 January 2013
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 345718
URI: http://eprints.soton.ac.uk/id/eprint/345718
ISSN: 0921-5093
PURE UUID: 658b7294-5078-4fea-b591-6cffd2f942d9
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Date deposited: 28 Nov 2012 14:07
Last modified: 15 Mar 2024 03:13
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Ying Chun Wang
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