Microstructural evolution in a 5024 aluminum alloy processed by ECAP with and without back pressure

Mogucheva, Anna; Babich, E. P.; Ovsyannikov, B. V.; Kaibyshev, Rustam

doi:10.1016/j.msea.2012.09.054

Cited by 57 publications

(58 citation statements)

References 35 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%

“…The dislocation density was increased by more than an order of magnitude. No visible effect of ECAP on the size or distribution of Al 3 (Sc,Zr) dispersoids was found (see also [28]). …”

Section: Microstructure Before and After Ecapmentioning

confidence: 94%

“…The details of the alloy manufacturing procedure, the initial microstructures, and the overall mechanical properties of the investigated material were described elsewhere [25,28] and will be briefly outlined here. The 5024 alloy with a chemical composition of Al-4.57Mg-0.35Mn-0.2Sc-0.09Zr (wt.…”

Section: Methodsmentioning

confidence: 99%

“…The resulting microstructure will be denoted hereinafter as coarse-grained (CG) condition. To obtain ultra-fine-grained (UFG) material, rectangular samples with dimensions of 20 × 20 × 100 mm 3 were machined from the central part of the extruded ingot parallel to the extrusion direction and subjected to equal-channel angular pressing (ECAP) to a total strain~12 at a temperature of 300 • C using route B C [28,29].…”

Section: Methodsmentioning

confidence: 99%

“…[28]). The main secondary phase was represented by coherent dispersoids of an Al 3 (Sc,Zr)-phase with average size about 10-15 nm and equiaxed shape.…”

Section: Microstructure Before and After Ecapmentioning

confidence: 99%

See 4 more Smart Citations

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%

“…The dislocation density was increased by more than an order of magnitude. No visible effect of ECAP on the size or distribution of Al 3 (Sc,Zr) dispersoids was found (see also [28]). …”

Section: Microstructure Before and After Ecapmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…[28]). The main secondary phase was represented by coherent dispersoids of an Al 3 (Sc,Zr)-phase with average size about 10-15 nm and equiaxed shape.…”

Section: Microstructure Before and After Ecapmentioning

confidence: 99%

See 3 more Smart Citations

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

Lebyodkin

Lebedkina

Mogucheva

et al. 2017

Metals

View full text Add to dashboard Cite

show abstract

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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Enhancement of Mechanical and Electrical Properties in Al 6101 Alloy by Severe Shear Strain under Hydrostatic Pressure

et al. 2018

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Samples of commercially received aluminum AA6101 alloy are homogenized, quenched, and subjected to 2, 4, and 8 passes of Equal Channel Angular Pressing (ECAP) with 200 MPa of applied backpressure. Tensile strength of the alloy's samples increases with the accumulated strain to the double value of 400 MPa after 8 ECAP passes, while electrical conductivity slightly decreases from 51.3 to 48.2%IACS. Aging at 130 C for 72 h is used to restore conductivity with very small loss of strength. Moreover, the increase in conductivity is directly proportional to the number of ECAP passes and conductivity exceeds those values measured for the as-received and solution treated states. Strong inhomogeneity of the microstructure and formation of a network of differently oriented shear bands during severe plastic deformation is observed, which is beneficial for simultaneous enhancement of mechanical and electrical properties.

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Microstructural evolution in a 5024 aluminum alloy processed by ECAP with and without back pressure

Cited by 57 publications

References 35 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

Enhancement of Mechanical and Electrical Properties in Al 6101 Alloy by Severe Shear Strain under Hydrostatic Pressure

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