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Microstructural evolution and microhardness variations in pure titanium processed by high‐pressure torsion

Microstructural evolution and microhardness variations in pure titanium processed by high‐pressure torsion
Microstructural evolution and microhardness variations in pure titanium processed by high‐pressure torsion
A grade 2 pure titanium with an initial grain size of ~50 m is processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa. The microhardness variations are examined and the results show the disks are reasonably homogeneous after 10 turns of torsional straining. The microstructural evolution is systematically characterized by optical microscopy, X-ray diffraction and transmission electron microscopy to provide information on the effect of shear strain on grain size and microstructure. The results demonstrate that the initial coarse structure is gradually refined from the edge to the center of the disk under the shear stress during HPT processing and an ultrafine-grained pure Ti is achieved with an average grain size of ~96 nm after 10 turns. A model is developed by considering the formation of subgrain boundaries, twins and high-angle grain boundaries for the grain refinement of pure Ti processed by HPT.
high-pressure torsion, microforming, microstructures, pure titanium, ultrafine grains
1438-1656
Chen, Wanji
42d0d66d-095e-45b3-bf8d-da81a2c6d877
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Liu, Detong
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Bao, Jianxing
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Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
6454155d-fa5f-480b-8747-88d06498a923
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Chen, Wanji
42d0d66d-095e-45b3-bf8d-da81a2c6d877
Xu, Jie
ff6d4656-c15b-45a4-bd71-d45937ec38fc
Liu, Detong
72f0ce17-2a76-460a-8d2e-2722c81cab1e
Bao, Jianxing
32a5f35f-ac06-4a33-9e58-239168866f2a
Sabbaghianrad, Shima
2dbc35ee-f341-42fd-9081-94ef3e9b10b0
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
6454155d-fa5f-480b-8747-88d06498a923
Langdon, Terence G
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Chen, Wanji, Xu, Jie, Liu, Detong, Bao, Jianxing, Sabbaghianrad, Shima, Shan, Debin, Guo, Bin and Langdon, Terence G (2020) Microstructural evolution and microhardness variations in pure titanium processed by high‐pressure torsion. Advanced Engineering Materials, 22 (6), [1901462]. (doi:10.1002/adem.201901462).

Record type: Article

Abstract

A grade 2 pure titanium with an initial grain size of ~50 m is processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa. The microhardness variations are examined and the results show the disks are reasonably homogeneous after 10 turns of torsional straining. The microstructural evolution is systematically characterized by optical microscopy, X-ray diffraction and transmission electron microscopy to provide information on the effect of shear strain on grain size and microstructure. The results demonstrate that the initial coarse structure is gradually refined from the edge to the center of the disk under the shear stress during HPT processing and an ultrafine-grained pure Ti is achieved with an average grain size of ~96 nm after 10 turns. A model is developed by considering the formation of subgrain boundaries, twins and high-angle grain boundaries for the grain refinement of pure Ti processed by HPT.

Text
JX-AEM-2020 - Accepted Manuscript
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More information

Accepted/In Press date: 18 February 2020
e-pub ahead of print date: 6 March 2020
Keywords: high-pressure torsion, microforming, microstructures, pure titanium, ultrafine grains

Identifiers

Local EPrints ID: 439250
URI: http://eprints.soton.ac.uk/id/eprint/439250
ISSN: 1438-1656
PURE UUID: 256749a9-fb24-4785-8b49-20904069b376
ORCID for Terence G Langdon: ORCID iD orcid.org/0000-0003-3541-9250

Catalogue record

Date deposited: 07 Apr 2020 16:31
Last modified: 26 Nov 2021 05:36

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Contributors

Author: Wanji Chen
Author: Jie Xu
Author: Detong Liu
Author: Jianxing Bao
Author: Shima Sabbaghianrad
Author: Debin Shan
Author: Bin Guo

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