Chechulina Serrated yielding: physical mechanisms, experimental dates, macro- phenomenological models

Трусов, П. В.; Chechulina, Evgeniia

doi:10.15593/perm.mech/2014.3.10

Cited by 8 publications

(5 citation statements)

References 11 publications

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“…The problem with the appearance of unstable plastic flow is of great practical importance, since the PLC effect plays a negative role in the processing of industrial alloys. Presents of the strain localization bands (PLC bands) decreases the mechanical properties of products and the plasticity of materials [14].…”

Section: Discussionmentioning

confidence: 99%

“…Usually, the PLC effect manifests itself on material loading curves in the form of steps or teeth (serration) of various types that have a common appearance for different materials [5]. For each alloy, there is its own temperature-velocity region of existence of the PLC, where unstable plastic flow is not observed, and the deformation curves are smooth [14,15]. The process of twinning or martensitic transformation can be another variant of the manifestation of the PLC effect [16,17].…”

Section: Discussionmentioning

confidence: 99%

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Analysis of Unstable Plastic Flow in the Porous 316L Samples Manufactured with a Laser 3D Printer

et al. 2022

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The study of unstable plastic flow in porous steel 316L samples after compression deformation at room temperature with different strain rates was carried out. The samples were obtained from ASTM F3184 medical grade steel powder by digital metallurgy using a Renishaw AM 400 laser 3D printer. Serrations on the stress-strain curves and strain localization bends were found, which were associated with the Portevin-Le Chatelier effect and testified instability of the plastic flow of the material under the deformation process. Deformation twins were observed in the structure of deformed samples.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Analysis of Unstable Plastic Flow in the Porous 316L Samples Manufactured with a Laser 3D Printer

et al. 2022

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“…It is worth noticing that all three orientations evidenced the phenomenon of serrated yielding or serrated flow, also known as the Portevin-Le Chatelier (PLC) effect, as reported also by [20] for the same WAAM processed AA5083 alloy. This phenomenon is due to plastic deformation instability and can be observed in the stress-strain curves of many metal alloys as repetitive steps, called yielding teeth or serrated yielding [56]. The PLC effect is associated with diffusion of solute atoms occurring at higher rate than speeds of dislocations and is a well-known issue concerning Al-Mg alloys as well as the 5083 alloy [56][57][58], but it has also been associated with preferential crystallographic orientations [59].…”

Section: Tensile and Hardness Datamentioning

confidence: 99%

AA5083 (Al–Mg) plates produced by wire-and-arc additive manufacturing: effect of specimen orientation on microstructure and tensile properties

et al. 2021

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Among various additive manufacturing (AM) technologies, wire-and-arc additive manufacturing (WAAM) is one of the most suitable for the production of large-scale metallic components, also suggesting possible applications in the construction field. Several research activities have been devoted to the WAAM of steels and titanium alloys and, recently, the application of WAAM to aluminum alloys has also been explored. This paper presents the microstructural and mechanical characterization of WAAM plates produced using a commercial ER 5183 aluminum welding wire. The aim is to evaluate the possible anisotropic behavior under tensile stress of planar elements, considering three different extraction directions in relation to the deposition layer: longitudinal (L), transversal (T) and diagonal (D). Compositional, morphological, microstructural and fractographic analyses were carried out to relate the specific microstructural features induced by WAAM to the tensile properties. An anisotropic behavior was found in regard to the specimen orientation, with the lowest strength and ductility found on T specimens. Reasoning to this was found in the presence of microstructural discontinuities unfavorably oriented with regard to the tensile direction. The results of tensile tests also highlighted an overall good mechanical behavior, comparable to that of conventional AA5083-O sheets, suggesting future use in the realization of very complex geometries and optimized shapes for lightweight structural applications.

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“…The PLC effect reduces the surface quality of the material, causes non-uniform development of deformations, and causes a significant decrease in strength and ductility. In this case, the formation of strain bands and macroscopic localization of plastic flows lead to a difference in thickness of structural elements, stress concentration, defects, and, therefore, the initiation of macroscopic failure processes [4][5][6][7][8]. It is a promising approach to obtaining and systematizing experimental data on the jerky flow under various types of mechanical effects.…”

Section: Introductionmentioning

confidence: 99%

Spatial-Time Inhomogeneity Due to the Portevin-Le Chatelier Effect Depending on Stiffness

Tretyakova

Tretyakov

2023

Metals

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This work is devoted to the study of the influence of the rigidity of the loading system on the kinetics of the initiation and propagation of the Portevin-Le Chatelier (PLC) strain bands due to the jerky flow in Al-Mg alloy. To estimate the influence of the loading system, the original loading attachment, which allows reducing the stiffness in a given range, was used. Registration of displacement and strain fields on the specimen surface was carried out with the Vic-3D non-contacting deformation measurement system based on the Digital Image Correlation (DIC) technique. The mechanical uniaxial tension tests were carried out using samples of Al-Mg alloy at the biaxial servo-hydraulic testing system Instron 8850. As a result of tensile tests, deformation diagrams were obtained for Al-Mg alloy samples tested at different values of stiffness of the loading system: 120 MN/m (nominal value), 50 MN/m, 18 MN/m, and 5 MN/m. All diagrams show discontinuous plastic deformations (the Portevin-Le Chatelier effect). It is noted that a decrease in the rigidity of the loading system leads to a change in the type of jerky flow. At constant parameters of the loading rate, temperature, and chemical composition of the material, the PLC effects of types A, B, and C are recorded in tests.

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Chechulina Serrated yielding: physical mechanisms, experimental dates, macro- phenomenological models

Cited by 8 publications

References 11 publications

Analysis of Unstable Plastic Flow in the Porous 316L Samples Manufactured with a Laser 3D Printer

Analysis of Unstable Plastic Flow in the Porous 316L Samples Manufactured with a Laser 3D Printer

AA5083 (Al–Mg) plates produced by wire-and-arc additive manufacturing: effect of specimen orientation on microstructure and tensile properties

Spatial-Time Inhomogeneity Due to the Portevin-Le Chatelier Effect Depending on Stiffness

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