Repeated equal-channel angular extrusion of polypropylene: Processing routes and back-pressure influence
| Autor: | Fahmi Zaïri, Yuri Voznyak, Ramdane Boulahia, Jean-Michel Gloaguen |
|---|---|
| Přispěvatelé: | Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 (LGCgE), Université d'Artois (UA)-Université de Lille-Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Université de Lille |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Polypropylene
Materials science Equal channel angular extrusion Back pressure 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound [SPI.GCIV]Engineering Sciences [physics]/Civil Engineering chemistry Mechanics of Materials Phase (matter) Ultimate tensile strength Materials Chemistry General Materials Science Extrusion Deformation (engineering) Composite material 0210 nano-technology Saturation (chemistry) |
| Zdroj: | Materials Today Communications Materials Today Communications, 2020, ⟨10.1016/j.mtcomm.2020.101754⟩ Materials Today Communications, Elsevier, 2020, ⟨10.1016/j.mtcomm.2020.101754⟩ |
| ISSN: | 2352-4928 |
| DOI: | 10.1016/j.mtcomm.2020.101754⟩ |
| Popis: | Multi-pass equal channel angular extrusion (ECAE) process of polypropylene was investigated at room temperature using a 90° die-angle tooling outfitted with a back-pressure. The process was repeated until eight times using two different extrusion orientation routes: route A where the sample orientation is kept constant between each extrusion and route C where the sample is rotated by 180°. The crystalline textures were examined by WAXS measurements and the changes on the mechanical response were observed by full-field strain measurements during tensile tests. The use of a back-pressure turns the deformation behavior, along the flow direction of the ECAE products, from highly heterogeneous (characterized by a peculiar periodic shear-banding behavior) to roughly homogeneous and leads to completely different plastic processes in the crystalline phase. The textural differences subsequent to the multi-pass processing and the use of a back-pressure are the source of significant differences in tensile response along the flow direction. The observations show that the polypropylene processed via route C reaches more easily a saturation state than that obtained via route A with a strong beneficial influence of a back-pressure. |
| Databáze: | OpenAIRE |
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