Influences of strain rate and grain size on yield and serrated flow in commercial Al-Mg alloy 5086

Wagenhofer, M; Erickson-Natishan, M. A.; Armstrong, Ronald W.; Zerilli, Frank J.

doi:10.1016/s1359-6462(99)00265-1

Cited by 80 publications

(40 citation statements)

References 15 publications

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“…Chen et al [128] used the concept of local vacancy enrichment in the region near the dislocation core to account for their observed Arrhenius relationships. This concept also explains the observed grain size [133].…”

Section: Crystal Size Orientation and Dislocation Densitysupporting

confidence: 57%

“…This is in contrast to the study of Shabadi et al [43], where the specimen orientation did not affect the magnitude of the serrations of the PLC effect in solution-treated AA 2219 alloy specimens. A smaller grain size promotes the PLC effect, as confirmed for 5086 Al-Mg alloys [133]. Chen et al [128] analyzed the critical strain in a series of tests on face-centered substitutional alloys and found Arrhenius-type relationships between critical strain and test temperature for numerous systems.…”

Section: Crystal Size Orientation and Dislocation Densitymentioning

confidence: 88%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

238

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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: Crystal Size Orientation and Dislocation Densitysupporting

confidence: 57%

Section: Crystal Size Orientation and Dislocation Densitymentioning

confidence: 88%

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

Yılmaz¹

2011

Science and Technology of Advanced Materials

238

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“…1 shows a typical stress Á/strain curve obtained in this manner. Observe that there is a serrated flow beyond a critical strain, indicating the presence of dynamic strain aging [12].…”

Section: Materials and Mechanical Testsmentioning

confidence: 96%

Three-dimensional particle cracking damage development in an Al–Mg-base wrought alloy

Balasundaram

Gokhale

Graham

et al. 2003

Materials Science and Engineering: A

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Experiments have been performed to quantitatively characterize the three-dimensional (3-D) microstructural damage due to cracking of Fe-rich intermetallic particles in an Al Á/Mg-base extruded 5086(O) alloy as a function of strain under uniaxial compression and tension. The 3-D number density and average volume of the cracked particles are estimated using the unbiased and efficient large area disector (LAD) stereological technique. In each specimen, the two-dimensional (2-D) number fraction of cracked particles is significantly lower than the corresponding 3-D number fraction. Therefore, the conventional 2-D damage measurements considerably underestimate the true 3-D damage due to particle cracking in this alloy. Comparison of the 3-D damage data on the 5086(O) alloy and earlier data on 6061(T6) alloy reveals that at all tensile/compressive stress levels higher than the yield stress of both alloys, the 3-D number fraction of cracked Fe-rich intermetallic particles in the 5086(O) alloy is significantly lower than its corresponding value in the 6061(T6) alloy. Therefore, the 5086(O) alloy is less prone to damage progression due to particle cracking compared to the 6061(T6) alloy. In both the alloys, significant rotations of the Fe-rich intermetallic particles occur during deformation under uniaxial compression. These rotations tend to align the particles along the direction of induced tensile stretch. The particle rotations in turn affect the progression of damage due to particle cracking. For deformation under uniaxial compression, the average volume of cracked Fe-rich particles increases with the increase in the strain. These observations are explained on the basis of the particle rotations. #

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“…Most results show that the PLC effect arises from a dynamic interaction between dislocations and solute atoms. The PLC effect has been observed in solid solution alloys [2][3][4][5][6][7] and also in precipitate systems such as Ni-based superalloys e.g., References 8 through 12 and in Ni-Fe base superalloys, e.g., Reference 13. In broad outline, the solute atoms segregate to regions in the lattice which are dilated by the presence of dislocations to reduce the overall strain energy of the system.…”

Section: Introductionmentioning

confidence: 99%

The Portevin-Le Chatelier Effect in the Ni-Based Superalloy IN100

Fernandez-Zelaia

Adair

Barker

et al. 2015

Metall Mater Trans A

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The Portevin-Le Chatelier (PLC) effect has been studied in the Ni-based superalloy IN100 which is currently used as a disk material in jet engines. A series of tensile tests was carried out at 588 K, 755 K, and 922 K (315°C, 482°C, and 649°C) at plastic strain rates ranging from a low of 6.21 9 10 À6 s À1 to a high of 4.92 9 10 À2 s À1 . The activation energy was determined using the slope of a line on a strain rate/temperature graph which divided the area of the graph into two regions: (1) ''PLC behavior observed,'' and (2) ''No PLC behavior observed.'' A new statistical approach was developed to objectively differentiate between a true PLC effect and experimental uncertainty (i.e., ''noise''). The value of the activation energy was found to be 1.14 eV/atom, which strongly suggests that the rate controlling process was bulk diffusion of C in the lattice. A qualitative model, based on the Orowan equation and slip band dislocation mechanics, was proposed, which unifies the seemingly disparate ideas of the process being controlled by a single atom/dislocation interaction while at the same time exhibiting significant strains during PLC load drops.

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Influences of strain rate and grain size on yield and serrated flow in commercial Al-Mg alloy 5086

Cited by 80 publications

References 15 publications

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

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

Three-dimensional particle cracking damage development in an Al–Mg-base wrought alloy

The Portevin-Le Chatelier Effect in the Ni-Based Superalloy IN100

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