Strengthening mechanisms in a Zr-modified 5083 alloy deformed to high strains

Malopheyev, Sergey; Kaibyshev, Rustam

doi:10.1016/j.msea.2014.10.030

Cited by 71 publications

(49 citation statements)

References 32 publications

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“…This trend agrees with the requirement of negative strain-rate sensitivity (SRS) in the DSA theory, as a necessary condition of plastic instability. However, the strength variation between samples was considerable, especially after ECAP [24][25][26][27][28]. Consequently, quantitative estimations of the SRS were not performed in the present work.…”

Section: Stress Serrations Patternsmentioning

confidence: 91%

Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

Lebyodkin

Lebedkina

Mogucheva

et al. 2017

Metals

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Abstract:The work addresses the effects of nanosize particles and grain refinement on the patterns of stress serrations and kinematics of deformation bands associated with the Portevin-Le Chatelier instability of plastic flow. Ultra-fine-grained microstructure was obtained using equal-channel angular pressing of the initial coarse-grained alloy. Tensile tests were carried out on flat specimens at strain rates in the range from 3 × 10 −5 to 1.4 × 10 −2 s −1 . Using local extensometry techniques, it was found that the presence of nanoscale precipitates promotes quasi-continuous propagation of deformation bands in the entire strain-rate range. The grain refinement leads to a transition to relay-race propagation at high strain rates and static strain localization at low rates. The results are discussed from the viewpoint of competition between various dynamical modes of plastic deformation associated with collective dynamics of dislocations.

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Section: Stress Serrations Patternsmentioning

confidence: 91%

Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

Lebyodkin

Lebedkina

Mogucheva

et al. 2017

Metals

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“…The mentioned increase in the PS compared with the hot-rolled alloy is attributed to grain boundary strengthening related to the refinement of grains [21] because the lattice dislocation densities in the alloy with the UFG structure and under the hot-rolled conditions are the same. The mentioned increase in the PS compared with the hot-rolled alloy is attributed to grain boundary strengthening related to the refinement of grains [21] because the lattice dislocation densities in the alloy with the UFG structure and under the hot-rolled conditions are the same.…”

Section: Tensile Behaviormentioning

confidence: 98%

“…The present experimental data show that extensive grain refinement up to %0.7 mm is an effective method to concurrently increase strength, ductility, and toughness of the Al-Mg-Mn-Sc alloy under certain conditions. The mentioned increase in the PS compared with the hot-rolled alloy is attributed to grain boundary strengthening related to the refinement of grains [21] because the lattice dislocation densities in the alloy with the UFG structure and under the hot-rolled conditions are the same. [10] It is worth noting that the efficiency of grain boundary strengthening increases with decreasing temperature.…”

Section: Tensile Behaviormentioning

confidence: 98%

Mechanical Behavior of an Al–Mg–Mn–Sc Alloy with an Ultrafine Grain Structure at Cryogenic Temperatures

Kaibyshev

2015

Adv Eng Mater

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The mechanical properties of an Al-Mg-Mn-Sc alloy with a grain size of %0.7 mm were examined at temperatures ranging from 77 to 293 K. An ultrafine grain structure was produced by equal-channel angular pressing at 593 K up to a total strain of %12. It was demonstrated that extensive grain refinement enhances strength and ductility at ambient and cryogenic temperatures and highly enhances fracture toughness at room temperature. The alloy exhibits a well-defined ductile-brittle transition attributed to the influence of temperature on nucleation and the growth of microvoids.

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“…Further, the UTS registered in the commercial alloys ranged from 124 MPa to 205 MPa, depending on the Mg content [23]. This behavior can be explained by the amount of cold work that led to significant gains in UTS in these aluminum alloys [25].…”

Section: Numerical Analysis Of the Plc Signalmentioning

confidence: 99%

Al/Niobium Diboride Nanocomposite’s Effect on the Portevin-Le Chatelier Phenomenon in Al-Mg Alloys

et al. 2019

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In Al-Mg alloys, the Portevin-Le Chatelier phenomenon, or dynamic strain aging, reveals itself as serrations upon plastic tensile deformation. This research evaluates this phenomenon when Al/NbB2 nanocomposite pellets are added to a magnesium-supersaturated Al matrix. A ball-milled 90 wt % Al and 10 wt % NbB2 nanocomposite helped inoculate an Al-Mg melt to incorporate the nanoparticles effectively. The melt was cast into rods that were cold-rolled into 1 mm diameter wires. Two sets were prepared: The first group was an as-cast set of samples, for comparison purposes, whereas the second was a solution-treated set. The solution treatment consisted of annealing followed by ice-water quenching. The results corroborating that the phenomenon was observable only in the specimens bearing the solution treatment, were used as the research baseline. Said treated alloy was compared to one containing the nanoparticles, which proved that the NbB2 particles caused a reduction of the serrated signal amplitude.

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Strengthening mechanisms in a Zr-modified 5083 alloy deformed to high strains

Cited by 71 publications

References 32 publications

Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

Mechanical Behavior of an Al–Mg–Mn–Sc Alloy with an Ultrafine Grain Structure at Cryogenic Temperatures

Al/Niobium Diboride Nanocomposite’s Effect on the Portevin-Le Chatelier Phenomenon in Al-Mg Alloys

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