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EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION / CYRUS PERSIA

Swansea University Author: CYRUS PERSIA

  • E-Thesis under embargo until: 15th August 2026

DOI (Published version): 10.23889/SUthesis.64445

Abstract

Constrained groove pressing (CGP) is a developing method that delivers pure shear during the deformation without any uniaxial strains. This approach of pure shear deformation is relatively new in metal deformation, and this could have significant impact in microstructural tailoring of metallic mater...

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Published: Swansea, Wales, UK 2023
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Prakash, Leo. and Das, Amit.
URI: https://cronfa.swan.ac.uk/Record/cronfa64445
first_indexed 2023-09-06T09:51:51Z
last_indexed 2024-11-25T14:14:03Z
id cronfa64445
recordtype RisThesis
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spelling 2023-10-20T16:45:22.4510109 v2 64445 2023-09-06 EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION ca6c7b36fac3a9fbd1eff2c56be9b113 CYRUS PERSIA CYRUS PERSIA true false 2023-09-06 Constrained groove pressing (CGP) is a developing method that delivers pure shear during the deformation without any uniaxial strains. This approach of pure shear deformation is relatively new in metal deformation, and this could have significant impact in microstructural tailoring of metallic material due to its added advantages. Thus, the interest is to perform CGP on key metallic materials having different crystal structure/microstructure and also having industrial relevance. In this context, the key aerospace materials, commercially pure titanium (CP-Ti) and Ti-6Al-4V having hexagonal closed packed crystal structure and Al 7075 and Inconel 718 having cubic (fcc) crystal structure, are selected to carry out CGP. Here, these materials having selected microstructures have groove pressed at different strain rates, ε ̇=0.4 s-1 and ε ̇=0.0004s-1, and undergone a detailed analysis using Electron backscattered diffraction (EBSD) technique. The macrostructure, bulk texture, microstructure, and micro-texture were characterised here to determine the in-build mechanisms of shear deformation and microstructural evolution during CGP. Our results show that slip, twinning, and slip/shear bands play a significant role in the microstructure development during the CGP. The slip and twin induced crystal rotations during CGP also discussed in this study. The crack initiation, propagation and fracture surface also analysed in this project to understand the failure mechanisms, in particular the mode of fracture (brittle, ductile, or mixed). E-Thesis Swansea, Wales, UK 18 7 2023 2023-07-18 10.23889/SUthesis.64445 COLLEGE NANME COLLEGE CODE Swansea University Prakash, Leo. and Das, Amit. Doctoral Ph.D EPSRC (EP/N509553/1) EPSRC (EP/N509553/1) 2023-10-20T16:45:22.4510109 2023-09-06T10:48:30.4487653 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering CYRUS PERSIA 1 Under embargo Under embargo 2023-09-06T10:52:08.7511295 Output 18322154 application/pdf E-Thesis true 2026-08-15T00:00:00.0000000 Copyright: The Author, Cyrus Persia, 2023. true eng
title EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
spellingShingle EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
CYRUS PERSIA
title_short EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
title_full EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
title_fullStr EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
title_full_unstemmed EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
title_sort EFFECT OF SHEAR STRAIN ON METAL DEFORMATION AND MICROSTRUCTURAL EVOLUTION
author_id_str_mv ca6c7b36fac3a9fbd1eff2c56be9b113
author_id_fullname_str_mv ca6c7b36fac3a9fbd1eff2c56be9b113_***_CYRUS PERSIA
author CYRUS PERSIA
author2 CYRUS PERSIA
format E-Thesis
publishDate 2023
institution Swansea University
doi_str_mv 10.23889/SUthesis.64445
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 0
active_str 0
description Constrained groove pressing (CGP) is a developing method that delivers pure shear during the deformation without any uniaxial strains. This approach of pure shear deformation is relatively new in metal deformation, and this could have significant impact in microstructural tailoring of metallic material due to its added advantages. Thus, the interest is to perform CGP on key metallic materials having different crystal structure/microstructure and also having industrial relevance. In this context, the key aerospace materials, commercially pure titanium (CP-Ti) and Ti-6Al-4V having hexagonal closed packed crystal structure and Al 7075 and Inconel 718 having cubic (fcc) crystal structure, are selected to carry out CGP. Here, these materials having selected microstructures have groove pressed at different strain rates, ε ̇=0.4 s-1 and ε ̇=0.0004s-1, and undergone a detailed analysis using Electron backscattered diffraction (EBSD) technique. The macrostructure, bulk texture, microstructure, and micro-texture were characterised here to determine the in-build mechanisms of shear deformation and microstructural evolution during CGP. Our results show that slip, twinning, and slip/shear bands play a significant role in the microstructure development during the CGP. The slip and twin induced crystal rotations during CGP also discussed in this study. The crack initiation, propagation and fracture surface also analysed in this project to understand the failure mechanisms, in particular the mode of fracture (brittle, ductile, or mixed).
published_date 2023-07-18T06:29:23Z
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score 11.096913

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