Three types of Portevin–Le Chatelier effects: Experiment and modelling

Jiang, Huifeng; Zhang, Qingchuan; Chen, Xuedong; Chen, Zhongjia; Jiang, Zhenyu; Wu, Xiaoping; Fan, Jinghong

doi:10.1016/j.actamat.2006.10.029

Cited by 228 publications

(94 citation statements)

References 41 publications

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“…At low strain rates, uncorrelated static type-C bands are seen. The corresponding stress-time plot displays large amplitude nearly regular serrations as in experiments [28,29,[42][43][44][45][46].…”

Section: The Portevin-le Chatelier Bands In the Ananthakrishna Modelmentioning

confidence: 85%

“…The PLC instability is seen in a window of strain rates and temperatures when samples of dilute metallic alloys are deformed under constant strain rate conditions. It is characterized by three types of bands and the associated stress-serrations [28,29,[42][43][44][45][46] observed with increasing strain rate or decreasing temperature. At the lower end of˙ a , randomly nucleated static type-C bands with large characteristic stress drops are seen.…”

Section: A a Dislocation Dynamical Model For A Continuous Yield Poinmentioning

confidence: 99%

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General framework for acoustic emission during plastic deformation

2015

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Despite the long history, so far there is no general theoretical framework for calculating the acoustic emission spectrum accompanying any plastic deformation. We set up a discrete wave equation with plastic strain rate as a source term and include the Rayleigh-dissipation function to represent dissipation accompanying acoustic emission. We devise a method of bridging the widely separated time scales of plastic deformation and elastic degrees of freedom. While this equation is applicable to any type of plastic deformation, it should be supplemented by evolution equations for the dislocation microstructure for calculating the plastic strain rate. The efficacy of the framework is illustrated by considering three distinct cases of plastic deformation. The first one is the acoustic emission during a typical continuous yield exhibiting a smooth stress-strain curve. We first construct an appropriate set of evolution equations for two types of dislocation densities and then show that the shape of the model stress-strain curve and accompanying acoustic emission spectrum match very well with experimental results. The second and the third are the more complex cases of the Portevin-Le Chatelier bands and the Lüders band. These two cases are dealt with in the context of the Ananthakrishna model since the model predicts the three types of the Portevin-Le Chatelier bands and also Lüders-like bands. Our results show that for the type-C bands where the serration amplitude is large, the acoustic emission spectrum consist of well separated bursts of acoustic emission. At higher strain rates of hopping type-B bands, the burst type acoustic emission spectrum tends to overlap forming a nearly continuous background with some sharp acoustic emission bursts. The latter can be identified with the nucleation of new bands. The acoustic emission spectrum associated with the continuously propagating type-A band is continuous. These predictions are consistent with experimental results. More importantly, our study shows that the low amplitude continuous acoustic emission spectrum seen in both the type-B and A band regimes is directly correlated to small amplitude serrations induced by propagating bands. The acoustic emission spectrum of the Lüders-like band matches with recent experiments as well. In all of these cases, acoustic emission signals are burst-like reflecting the intermittent character of dislocation mediated plastic flow.

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Section: The Portevin-le Chatelier Bands In the Ananthakrishna Modelmentioning

confidence: 85%

Section: A a Dislocation Dynamical Model For A Continuous Yield Poinmentioning

confidence: 99%

General framework for acoustic emission during plastic deformation

2015

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“…The analysis of serration shapes of mild carbon steels carried out by Cuddy and Leslie has shown that only type C bands form at random locations in a specimen gauge [36]. Similarly, aluminum alloys at certain strain rates and temperatures exhibit only one type of band, until the temperature or strain rate is changed [33,[37][38][39]. A series of studies conducted by Jiang et al [37,38] and Ranc and Wagner [40] have shown clear transitions among the serration types in Al-Cu alloys; the transitions have been observed using digital speckle correlation, pyrometric and digital image correlation (DIC) techniques on the surfaces of flat specimens during tensile tests.…”

Section: Plc Bandsmentioning

confidence: 99%

“…For instance, Hahner and Rizzi have precisely simulated the band speed, band width and plastic strain of a type A band from experimental space-time fields of plastic activity [55,134]. A DSA-based model proposed by Jiang et al [38] successfully describes all three types of bands obtained through changing the constant strain rate applied. Most recently, Ananthakrishna [72] has included the transitional dynamics of bands to his model in addition to all three types of PLC bands.…”

Section: Fundamental Achievementsmentioning

confidence: 99%

“…A schematic of the setup is shown in figure 12. During a tensile test, a flat specimen gauge is illuminated by two laser beams set at the same oblique angle on the same plane, and the change in the fringe pattern during the motion of PLC bands is recorded by a high-speed digital camera as described by Jiang et al [38,84]. Another procedure, the laser speckle technique (LST), has been derived from DSPC by Shabadi et al [43].…”

Section: Speckle Pattern Interferometrymentioning

confidence: 99%

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The Portevin–Le Chatelier effect: a review of experimental findings

Yılmaz¹

2011

Science and Technology of Advanced Materials

236

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The Portevin-Le Chatelier (PLC) effect manifests itself as an unstable plastic flow during tensile tests of some dilute alloys under certain regimes of strain rate and temperature. The plastic strain becomes localized in the form of bands which move along a specimen gauge in various ways as the PLC effect occurs. Because the localization of strain causes degradation of the inherent structural properties and surface quality of materials, understanding the effect is crucial for the effective use of alloys. The characteristic behaviors of localized strain bands and techniques commonly used to study the PLC effect are summarized in this review. A brief overview of experimental findings, the effect of material properties and test parameters on the PLC effect, and some discussion on the mechanisms of the effect are included. Tests for predicting the early failure of structural materials due to embrittlement induced by the PLC effect are also discussed.

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Topics in Materials Design, Temporal Multiscale Problems and Bio‐Materials

Fan

2010

Multiscale Analysis of Deformation and Failure of Materials

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Topics of multiscale analysis in cutting-edge areas are selected and introduced in the three parts of this chapter. Part 9.1 describes the methods and roles that multiscale analysis can take in materials design. Part 9.2 describes different concurrent and hierarchical temporal multiscale methods including principles and examples for simulation of infrequent event systems. Specifically, the nudged elastic band (NEB) method for finding minimum energy path (MEP) and saddle point is introduced and applications in investigating effects of strain rate and temperature on dislocation initiation, and in understanding large-scale separation of activation volume between plasticity and creep, and the in-depth mechanism of high strength and high ductility of nanocrystalline materials, are described and exemplified. Part 9.3 introduces hierarchical structures of protein materials, and discusses modeling in three scales including nano (protein), mesoscale (intermediate filaments and membranes of cells) and cell-implant interaction. Possible applications in enhancing the adhesion strength between cells and implants are addressed.

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Three types of Portevin–Le Chatelier effects: Experiment and modelling

Cited by 228 publications

References 41 publications

General framework for acoustic emission during plastic deformation

General framework for acoustic emission during plastic deformation

The Portevin–Le Chatelier effect: a review of experimental findings

Topics in Materials Design, Temporal Multiscale Problems and Bio‐Materials

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