The Portevin–Le Chatelier (PLC) effect and shear band formation in an AA5754 alloy

Halim, Herdawandi; Wilkinson, David S.; Niewczas, M.

doi:10.1016/j.actamat.2007.03.007

Cited by 253 publications

(107 citation statements)

References 23 publications

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“…During the increase in stress, the band remains unchanged, and cyclic strain accumulation occurs outside the bands shortly before the generation of new bands [82]. Some recent DIC studies suggest that the PLC effect does not form nuclei for the localized shear bands, which nucleate on a conjugate plane crossing the plane of the PLC bands [141]. Another work supports this finding and discusses a possible synergetic interaction between the PLC bands and shear bands [142].…”

Section: Fundamental Achievementssupporting

confidence: 71%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

235

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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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Section: Fundamental Achievementssupporting

confidence: 71%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

235

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“…It has been considered that DSA causes small elongation. 20,22) As demonstrated in the present study, however, DSA in the present alloy results in large elongation. The typical DSA generating in Fe alloy containing Cr and C is related to the elastic interaction between solute atoms, Cr and C, and edge dislocation core.…”

Section: Large Elongation At Intermediate Temperaturessupporting

confidence: 60%

“…The inverted strain rate dependence of the 0.2% proof stress and the negative m values are obvious indication of DSA as was pointed out by previous investigations. [18][19][20] In addition, it has been reported that the plateau in the yield stress-temperature diagram and the hump in the tensile strength-temperature diagram appear in the temperature range where DSA occurs. 21) In the case of the present alloy, the plateau and the hump in the diagram are observed in the temperature range where the serrations appear as shown in Fig.…”

Section: Large Elongation At Intermediate Temperaturesmentioning

confidence: 99%

Mechanical Properties of Biomedical Co-33Cr-5Mo-0.3N Alloy at Elevated Temperatures

2008

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In order to examine the mechanical properties of a biomedical Co-33Cr-5Mo-0.3N alloy at elevated temperatures, tensile tests have been conducted in the temperature range from room temperature to 1373 K at initial strain rates of 1:0 Â 10 À1 s À1 and 1:4 Â 10 À4 s À1 . The 0.2% proof stress and the tensile strength as a function of temperature have the plateau and the hump, respectively, at intermediate temperatures. The elongation to fracture increases at intermediate temperatures and abruptly decreases at higher temperatures. The decrease of the elongation at higher temperatures arises from the intergranular fracture, possibly caused by the equilibrium segregation of harmful elements such as sulfur. The serrations on the stress-strain curves are observed at intermediate temperatures. The temperature range where the elongation is enhanced and the serrations appear is shifted to lower temperatures at a low strain rate. The 0.2% proof stress does not increase with increasing strain rate and the strain rate sensitivity exhibits negative values at intermediate temperatures. It is considered that a serration leading to large elongation results from the dynamic strain aging.

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“…Bundan dolayı oda sıcaklığında Al-Mg alaşımlarının şekillendirilebilirliği PLC etkisinden dolayı sınırlı oranda kalmaktadır [12]. Bu olay katı Mg alaşımlarının dislokasyon hareketlerini engellemesi ile açıklanmaktadır [13].…”

Section: Gi̇ri̇ş (Introduction)unclassified