The effect of precipitation on the Portevin-Le Chatelier effect in an Al–Zn–Mg–Cu alloy

Thévenet, David; Mliha-Touati, M.; Zeghloul, A.

doi:10.1016/s0921-5093(99)00029-5

Cited by 104 publications

(46 citation statements)

References 12 publications

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“…These conclusions are consistent with the experimental work of Thevenet et al [119], who found that precipitation reduces the tendency for serrated flow to occur but that the underlying mechanism depends on the type of precipitate. The rates of precipitation in the aluminum alloy studied were increased by the addition of a large amount of copper, which suppressed the serrated flow after 2-3 h of solution treatment.…”

Section: Factors Influencing Plc Effectsupporting

confidence: 92%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

241

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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: Factors Influencing Plc Effectsupporting

confidence: 92%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

241

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“…It is proposed that the decrease in the critical strain take place by the generation of the vacancies during deformation which accelerate the diffusion of the solute Mg atoms and trap the dislocation in motion, whereas the increase in the critical strain is caused by the formation of the coherent clusters which traps the vacancies at their interface and inhibit the diffusion of the solute Mg atoms [8][9][10] . On the other hand, it is also advocated that the clusters in themselves constitute obstacles to the collective motion of the dislocations, resulting in the increase in the critical strain 11,12) .…”

Section: 5mentioning

confidence: 99%

“…zones) and precipitates suppress the serrated ow 5,[8][9][10][11][12][13] . These mechanisms, which have been proposed as several theories 5,[8][9][10][11][12][13] , are not persuasive enough because of the limitations of the standard analysis such as transmission electron micrograph (TEM) to characterize the nano-ordered clusters or precipitates in detail. It is therefore desirable to clarify the role of them in more detail.…”

Section: Introductionmentioning

confidence: 99%

Effects of Precipitation State on Serrated Flow in Al-Mg(-Zn) Alloys

et al. 2016

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The effects of the aging conditions on the serrated ow in Al-Mg(-Zn) alloys were investigated, focusing on the precipitation states. Al6%Mg and Al-6%Mg-3%Zn alloys were naturally and arti cially aged after solution treated and quenched. The serrated ow was examined by tensile test. As for the Al-6%Mg-3%Zn alloy, the naturally aged specimens show the increase in the critical strain for serrated ow. The Zn-Mg clusters are formed during natural aging. Furthermore, the increase in the number density and the size of these clusters corresponds to the increases in the critical strain, which reveals that the formation of these coherent clusters is one of the dominant factors for delaying the onset of serrated ow. On the other hand, as for the arti cially aged specimens in the under-aged conditions, the transformation of the clusters to the incoherent meta-stable precipitates brings about the decrease in the critical strain. Furthermore, the increase in the volume fraction of these precipitates in the over-aged conditions reduce the stress amplitude of serrated ow, which are brought about by the decrease in the solute Mg content.

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“…Some studies of Al alloys 15,16) reported that the interactions between mobile dislocations and precipitates resulted in the serrations of the flow curve. The sizes of precipitates were assumed to be responsible for the stress drop size and stress drop rate of serrations.…”

Section: )mentioning

confidence: 99%

Effects of Nb on the Microstructure and Elevated-Temperature Mechanical Properties of Alloy 690-SUS 304L Dissimilar Welds

et al. 2008

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The purpose of this paper was to investigate the effects of Nb on the microstructure and elevated-temperature mechanical properties of Alloy 690-SUS 304L dissimilar welds. The results show that the welds were dominant with dendrites and interdendritic phases. In the low Nb welds, the main interdendritic phases were Nb-rich and Al-Ti-rich phases. Cr-carbides were precipitated along the grain boundaries of the root region. In the high Nb welds, there were large Nb-rich phases in the cap region, while smaller Nb-carbonitride precipitates were found in the root region. The addition of Nb increased the hardness of the fusion zones. At 300 C, though the tensile strengths of all welds were higher than that of 304L, micro-cracks were unexpectedly found in the low Nb weld. Notched specimens were tested to characterize the mechanical properties of the welds. Both of the yielding and tensile strengths of the welds increased with Nb additions. On the fracture surface, the brittle fracture features also became noticeable.

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The effect of precipitation on the Portevin-Le Chatelier effect in an Al–Zn–Mg–Cu alloy

Cited by 104 publications

References 12 publications

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

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

Effects of Precipitation State on Serrated Flow in Al-Mg(-Zn) Alloys

Effects of Nb on the Microstructure and Elevated-Temperature Mechanical Properties of Alloy 690-SUS 304L Dissimilar Welds

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