Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C
Equal channel angular extrusion (ECAE) is a solid-state extrusion process for modifying microstructures via severe plastic deformation without modifying the specimen cross section. In this study, changes in the microstructure and mechanical properties of polypropylene resulting from extrusion orient...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-12-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/23/5287 |
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| author | Qifeng Jiang Ramdane Boulahia Fahmi Zaïri Iurii Vozniak Zhengwei Qu Jean-Michel Gloaguen Xiaobing Liu |
| author_facet | Qifeng Jiang Ramdane Boulahia Fahmi Zaïri Iurii Vozniak Zhengwei Qu Jean-Michel Gloaguen Xiaobing Liu |
| author_sort | Qifeng Jiang |
| collection | DOAJ |
| description | Equal channel angular extrusion (ECAE) is a solid-state extrusion process for modifying microstructures via severe plastic deformation without modifying the specimen cross section. In this study, changes in the microstructure and mechanical properties of polypropylene resulting from extrusion orientation route A (no rotation between extrusions) and extrusion orientation route C (a rotation of 180° between extrusions) are investigated using a 90° die-angle tooling outfitted with back pressure. Important differences are reported for the ECAE-induced deformation behavior between the two processing routes. A focus is made on the occurrence of heterogeneous plastic deformations (periodic shear banding and warping) for both routes and the control and inhibition of the plastic instabilities via regulated back pressure and ram velocity. Wide-angle X-ray scattering is carried out to characterize the structural evolution as a function of the processing conditions including route, extrusion velocity and BP application. The mechanical properties of the specimens machined from the ECAE pieces are examined under different loading paths including uniaxial tension/compression and simple shear. Full-field displacements converted to volumetric strains revealed the profound impacts of the processing route on the deformation mechanisms during tensile deformation. |
| first_indexed | 2024-03-09T17:34:11Z |
| format | Article |
| id | doaj.art-cd3ed55087114b8aa480a4bc669fc44f |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-09T17:34:11Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-cd3ed55087114b8aa480a4bc669fc44f2023-11-24T12:01:33ZengMDPI AGPolymers2073-43602022-12-011423528710.3390/polym14235287Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and CQifeng Jiang0Ramdane Boulahia1Fahmi Zaïri2Iurii Vozniak3Zhengwei Qu4Jean-Michel Gloaguen5Xiaobing Liu6Key Laboratory of Fluid and Power Machinery, Xihua University, Chengdu 610039, ChinaLaboratory of Advanced Mechanics, University of Sciences and Technology Houari Boumediene, Algiers 16111, AlgeriaLaboratoire de Génie Civil et géo-Environnement, Université de Lille, IMT Nord Europe, JUNIA, Université d’Artois, ULR 4515-LGCgE, 59000 Lille, FranceCentre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90363 Lodz, PolandInternational School of Business Management and Technology, 59100 Roubaix, FranceUnité Matériaux et Transformations, Université de Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET, 59000 Lille, FranceKey Laboratory of Fluid and Power Machinery, Xihua University, Chengdu 610039, ChinaEqual channel angular extrusion (ECAE) is a solid-state extrusion process for modifying microstructures via severe plastic deformation without modifying the specimen cross section. In this study, changes in the microstructure and mechanical properties of polypropylene resulting from extrusion orientation route A (no rotation between extrusions) and extrusion orientation route C (a rotation of 180° between extrusions) are investigated using a 90° die-angle tooling outfitted with back pressure. Important differences are reported for the ECAE-induced deformation behavior between the two processing routes. A focus is made on the occurrence of heterogeneous plastic deformations (periodic shear banding and warping) for both routes and the control and inhibition of the plastic instabilities via regulated back pressure and ram velocity. Wide-angle X-ray scattering is carried out to characterize the structural evolution as a function of the processing conditions including route, extrusion velocity and BP application. The mechanical properties of the specimens machined from the ECAE pieces are examined under different loading paths including uniaxial tension/compression and simple shear. Full-field displacements converted to volumetric strains revealed the profound impacts of the processing route on the deformation mechanisms during tensile deformation.https://www.mdpi.com/2073-4360/14/23/5287severe plastic deformationequal channel angular extrusionpolypropylenemicrostructuremechanical properties |
| spellingShingle | Qifeng Jiang Ramdane Boulahia Fahmi Zaïri Iurii Vozniak Zhengwei Qu Jean-Michel Gloaguen Xiaobing Liu Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C Polymers severe plastic deformation equal channel angular extrusion polypropylene microstructure mechanical properties |
| title | Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C |
| title_full | Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C |
| title_fullStr | Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C |
| title_full_unstemmed | Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C |
| title_short | Microstructure and Mechanical Properties of Severely Deformed Polypropylene in ECAE (Equal Channel Angular Extrusion) via Routes A and C |
| title_sort | microstructure and mechanical properties of severely deformed polypropylene in ecae equal channel angular extrusion via routes a and c |
| topic | severe plastic deformation equal channel angular extrusion polypropylene microstructure mechanical properties |
| url | https://www.mdpi.com/2073-4360/14/23/5287 |
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