Microstructural characteristics of nickel processed to ultrahigh strains by high-pressure torsion
Microstructural characteristics of nickel processed to ultrahigh strains by high-pressure torsion
The microstructures of highly strained high-pressure torsion (HPT) nickel processed from bulk master metals pre-strained to different levels of strain and from electrodeposited (ED), ball milled (BM) samples and rapidly quenched (RQ) ribbons were studied by transmission electron microscopy and X-ray diffraction. High-resolution X-rays showed that the BM + HPT specimens had the smallest coherent domain size of 9 nm and the RQ + HPT samples possessed a high dislocation density of 6.7 × 1015 m?2. Gradually increasing the strain in bulk nickel led to an increasing dislocation density and a decreasing coherent domain size. Microhardness measurements revealed differences in the mechanical behavior in HPT-strained nickel specimens. There is a good correlation between the microhardness measurements and the dislocation density measured with high-resolution X-rays.
high-pressure torsion, microhardness, microstructure, nickel, ultrahigh strains, x-ray techniques
207-212
Zhilyaev, A.P.
fe22cdc1-590d-4bbd-bd1a-6ca18e3ee971
Gimazov, A.A.
da1834b5-860f-4c44-ae4c-ac09d1fcf526
Soshnikova, E.P.
fb48107b-269d-4f85-94f0-f721cf101e69
Révész, Á
0b72cc99-2fa4-4789-9130-b3242c80bf1b
Langdon, T.G.
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20 August 2008
Zhilyaev, A.P.
fe22cdc1-590d-4bbd-bd1a-6ca18e3ee971
Gimazov, A.A.
da1834b5-860f-4c44-ae4c-ac09d1fcf526
Soshnikova, E.P.
fb48107b-269d-4f85-94f0-f721cf101e69
Révész, Á
0b72cc99-2fa4-4789-9130-b3242c80bf1b
Langdon, T.G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhilyaev, A.P., Gimazov, A.A., Soshnikova, E.P., Révész, Á and Langdon, T.G.
(2008)
Microstructural characteristics of nickel processed to ultrahigh strains by high-pressure torsion.
Materials Science and Engineering: A, 489 (1-2), .
(doi:10.1016/j.msea.2007.12.031).
Abstract
The microstructures of highly strained high-pressure torsion (HPT) nickel processed from bulk master metals pre-strained to different levels of strain and from electrodeposited (ED), ball milled (BM) samples and rapidly quenched (RQ) ribbons were studied by transmission electron microscopy and X-ray diffraction. High-resolution X-rays showed that the BM + HPT specimens had the smallest coherent domain size of 9 nm and the RQ + HPT samples possessed a high dislocation density of 6.7 × 1015 m?2. Gradually increasing the strain in bulk nickel led to an increasing dislocation density and a decreasing coherent domain size. Microhardness measurements revealed differences in the mechanical behavior in HPT-strained nickel specimens. There is a good correlation between the microhardness measurements and the dislocation density measured with high-resolution X-rays.
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Published date: 20 August 2008
Keywords:
high-pressure torsion, microhardness, microstructure, nickel, ultrahigh strains, x-ray techniques
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 64264
URI: http://eprints.soton.ac.uk/id/eprint/64264
ISSN: 0921-5093
PURE UUID: 1ff1b92f-bae6-41cc-a0a2-cea31854aaf1
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Date deposited: 06 Jan 2009
Last modified: 16 Mar 2024 03:28
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Contributors
Author:
A.P. Zhilyaev
Author:
A.A. Gimazov
Author:
E.P. Soshnikova
Author:
Á Révész
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