The dynamics of Portevin–Le Chatelier bands in an Al–Mg alloy from infrared thermography

Ait-Amokhtar, H.; Fressengeas, Claude; Boudrahem, Samir

doi:10.1016/j.msea.2007.11.075

Cited by 76 publications

(43 citation statements)

References 19 publications

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“…• C [91]. The recorded temperatures are converted to dissipated heat powers using the heat transfer equation.…”

Section: Thermographic Techniquesmentioning

confidence: 99%

“…Using temperature field measurements, Ait-Amokhtar et al found a difference between type A and type B bands that has not been possible to detect by other means. For Al-Mg alloys, the hopping of type B bands has been related to a quasi-isothermal process, while nucleation and propagation of type A bands is quasi-adiabatic [31,91]. Ranc and Wagner studied an Al-Cu alloy at a constant strain rate and temperature and found that several type B bands can nucleate in the effective gauge of a specimen with a certain time interval between consecutive nucleations.…”

Section: Thermographic Techniquesmentioning

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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“…• C [91]. The recorded temperatures are converted to dissipated heat powers using the heat transfer equation.…”

Section: Thermographic Techniquesmentioning

confidence: 99%

Section: Thermographic Techniquesmentioning

confidence: 99%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

236

View full text Add to dashboard Cite

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“…This dynamic strain ageing can lead to a negative strain rate sensitivity of the flow stress within a certain range of applied strain rates and temperatures. This is when both types of defect have comparable mobility [11,18,19].…”

Section: Introductionmentioning

confidence: 99%

Serrated flow and work hardening characteristics of Al-5356 alloy

Saad¹,

Fayek²,

Fawzy³

et al. 2010

Journal of Alloys and Compounds

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“…Equation [8] forms the basis of many subsequent analyses in the literature. [20,[29][30][31][32] Zbib and Aifantis, [33] working from the same assumptions as used in Reference 4 arrived at Eq. [8] by means of a nonlinear instability analysis using strain gradient plasticity.…”

Section: S<0 ½8mentioning

confidence: 99%

A Revised Criterion for the Portevin–Le Châtelier Effect Based on the Strain-Rate Sensitivity of the Work-Hardening Rate

Liempt

Sietsma

2011

Metall Mater Trans A

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An improved analysis is presented of the stability of plastic deformation under conditions where dynamic strain aging (DSA) occurs, which leads to instabilities known as the Portevin-Le Chaˆtelier (PLC) effect. It is shown that PLC instabilities can occur for conditions that are not covered by the currently prevailing criterion presented by Estrin and Kubin (1991), which focuses on a negative strain rate sensitivity of the flow stress, caused by interactions of solutes with thermally activated glide of mobile dislocations. The current analysis recognizes that the strain-rate sensitivity of the flow stress consists of two contributions, one associated with glide of mobile dislocations and the second with work hardening, related to storage of immobile dislocations. In this paper, an instability criterion is proposed that takes into account the possibility of a negative strain-rate sensitivity of the work-hardening rate, which is caused by diffusion of solutes to immobile dislocations. The latter contribution leads to an extended instability criterion. This criterion also provides an explanation for the existence of a critical strain above which instabilities occur. In this article, previously published tensile test data are used to show that a negative strain-rate sensitivity of the work-hardening rate, which influences significantly the occurrence of the PLC effect, can indeed occur under DSA conditions.

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The dynamics of Portevin–Le Chatelier bands in an Al–Mg alloy from infrared thermography

Cited by 76 publications

References 19 publications

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

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

Serrated flow and work hardening characteristics of Al-5356 alloy

A Revised Criterion for the Portevin–Le Châtelier Effect Based on the Strain-Rate Sensitivity of the Work-Hardening Rate

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