Microhardness and microstructural evolution of pure nickel processed by high-pressure torsion
Microhardness and microstructural evolution of pure nickel processed by high-pressure torsion
High-purity Ni was processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa and a rotation rate of 1 rpm through 1/4 to 10 turns, and samples were then examined using Electron Back-Scattered Diffraction (EBSD) and microhardness measurements. The results show that the grain size and low-angle grain boundaries (LAGBs) gradually decrease with the growth of HPT revolutions while the microhardness values gradually increase. After 10 turns of HPT processing, ultrafine-grained (UFG) pure Ni with a reasonable microhardness value and microstructure homogeneity can be achieved across the disk, thereby giving great potential for applications in micro-forming. A grain refinement model for severe plastic deformation (SPD) of pure Ni is proposed.
HPT, UFG pure Ni, grain refinement, hardness testing, microstructure
Sun, Meng
74c0ba25-6a4c-4b48-8d91-06f3bc58e729
Ding, Chaogang
2edf8082-909e-4bec-a2b3-3b34943f5803
Xu, Jie
c3c79088-94e3-48d2-9228-275b4e7fffcf
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
f4dbe579-1803-49e4-99c0-cafa72c6a4c6
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
June 2023
Sun, Meng
74c0ba25-6a4c-4b48-8d91-06f3bc58e729
Ding, Chaogang
2edf8082-909e-4bec-a2b3-3b34943f5803
Xu, Jie
c3c79088-94e3-48d2-9228-275b4e7fffcf
Shan, Debin
fd8652eb-1eeb-4ae2-bcc4-102320f3c2d7
Guo, Bin
f4dbe579-1803-49e4-99c0-cafa72c6a4c6
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Sun, Meng, Ding, Chaogang, Xu, Jie, Shan, Debin, Guo, Bin and Langdon, Terence G.
(2023)
Microhardness and microstructural evolution of pure nickel processed by high-pressure torsion.
Crystals, 13 (6), [887].
(doi:10.3390/cryst13060887).
Abstract
High-purity Ni was processed by high-pressure torsion (HPT) at room temperature under an imposed pressure of 6.0 GPa and a rotation rate of 1 rpm through 1/4 to 10 turns, and samples were then examined using Electron Back-Scattered Diffraction (EBSD) and microhardness measurements. The results show that the grain size and low-angle grain boundaries (LAGBs) gradually decrease with the growth of HPT revolutions while the microhardness values gradually increase. After 10 turns of HPT processing, ultrafine-grained (UFG) pure Ni with a reasonable microhardness value and microstructure homogeneity can be achieved across the disk, thereby giving great potential for applications in micro-forming. A grain refinement model for severe plastic deformation (SPD) of pure Ni is proposed.
Text
crystals-13-00887
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More information
Accepted/In Press date: 24 May 2023
e-pub ahead of print date: 28 May 2023
Published date: June 2023
Additional Information:
Funding Information:
This research was funded by the National Natural Science Foundation of China, grant number No.51635005. The work of one of us was supported by the European Research Council under Grant Agreement No. 267464-SPDMETALS (TGL).
Publisher Copyright:
© 2023 by the authors.
Keywords:
HPT, UFG pure Ni, grain refinement, hardness testing, microstructure
Identifiers
Local EPrints ID: 483027
URI: http://eprints.soton.ac.uk/id/eprint/483027
ISSN: 2073-4352
PURE UUID: ccce73df-8a32-4991-a9fc-264e82609d12
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Date deposited: 19 Oct 2023 17:02
Last modified: 06 Jun 2024 01:40
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Contributors
Author:
Meng Sun
Author:
Chaogang Ding
Author:
Jie Xu
Author:
Debin Shan
Author:
Bin Guo
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