Investigation of Effect of Preliminary Annealing on Superplasticity of Ultrafine-Grained Conductor Aluminum Alloys Al-0.5%Mg-Sc

Gryaznov, M. Yu.; Шотин, С. В.; Нохрин, А. В.; Чувильдеев, В. Н.; Likhnitskii, C.V.; Копылов, В. И.; Чегуров, М. К.; Tabachkova, N. Yu.; Shadrina, I. S.; Smirnova, E. S.; Пирожникова, О. Э.

doi:10.3390/ma15010176

Cited by 4 publications

(7 citation statements)

References 50 publications

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“…The dislocation-disclination type defects forming around large secondary particles in the superplasticity conditions can lead to acceleration of the cavitation destruction of the UFG alloys [103][104][105][106]. Similar effect was described earlier for the case of superplasticity of UFG conductor aluminum alloys Al-0.5%Mg-Sc [81,82].…”

Section: Alloysupporting

confidence: 59%

“…Thus, ECAP provides all the necessary conditions conducive to the superplasticity effect in aluminum alloys. Superplasticity of UFG aluminum alloys produced by ECAP is studied thoroughly in many works (see, for example, [81,82,107,[114][115][116][117][118]), therefore, we will not dwell on their analysis. For the purposes of analyzing the results that we obtained, we should only emphasize that UFG conducting aluminum alloys exhibit very good superplastic properties (Table 5).…”

Section: Discussionmentioning

confidence: 99%

“…It should be emphasized that UFG Sc-doped alloys exhibit the highest superplastic characteristics [81,82,[115][116][117][118][119]. Al3Sc particles and Sc-containing intermetallic compounds of variable composition with L12 structure are among the most effective stabilizers for a nonequilibrium UFG microstructure of aluminum alloys [18][19][20][21][122][123][124][125].…”

Section: Discussionmentioning

confidence: 99%

“…Deformation behavior of conductor aluminum alloys at elevated temperatures remains under researched, although deformation of an aluminum workpiece in most cases takes place at elevated temperatures. There are many scientific papers on superplasticity of fine-grained conductor 6XXX Al alloys [70][71][72][73][74][75][76][77][78][79] but only few works on Mg-free UFG Al-1%Zr alloys [80] and Al-0.5%Mg-Sc alloys [81,82]. Optimal temperatures and strain rates will help to produce aluminum wires with a minimum number of breaks.…”

Section: Introductionmentioning

confidence: 99%

“…High stability of a UFG microstructure in aluminum alloys at lower heating temperatures allows for stable properties of thin wires operating at 200-250 °C [7,8,43,68,69]. Besides, the stability of a nonequilibrium UFG microstructure at low temperatures will enable the low-temperature superplasticity effect in UFG aluminum alloys [70][71][72][73][74][75][76][77]81,82]. Raising ductility of aluminum alloys while reducing their optimal deformation temperatures can help to increase energy efficiency of production, in particular to reduce the number of breaks during manufacturing of thin wires and to reduce the wear of equipment used in wire manufacturing.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Sc, Hf, and Yb Additions on Superplasticity of a Fine-grained Al-0.4%Zr Alloy

Нохрин¹,

Gryaznov²,

Shotin³

et al. 2022

Preprint

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The research was undertaken to study the way deformation behaves in ultrafine-grained (UFG) conducting Al-Zr alloys doped with Sc, Hf, and Yb. All in all, 8 alloys were studied with zirconium partially replaced by Sc, Hf, and/or Yb. Doping elements (X = Zr, Sc, Hf, Yb) in the alloys total 0.4 wt.%. The choice of doping elements is conditioned by possible precipitation of Al3X particles with L12 structure while annealing these alloys. Such particles provide higher thermal stability of a nonequilibrium UFG microstructure. Initial coarse-grained samples were obtained by induction casting. The UFG microstructure in the alloys was formed by Equal Channel Angular Pressing (ECAP) at 225°C. Superplasticity tests were carried out at temperatures ranging from 300 to 500 °C and strain rates varying between 3.310-4 and 3.310-1 s-1. The highest values of elongation to failure are observed in Sc-doped alloys. A UFG Al-0.2%Zr-0.1%Sc-0.1%Hf alloy has maximum ductility: at 450 °C and a strain rate of 3.310-3 s-1, relative elongation to failure reaches 765%. At the onset of superplasticity, stress–strain curves are characterized by a stage of homogeneous strain and a long stage of localized plastic flow. The dependence of homogeneous strain (eq) on test temperature in UFG Sc-doped alloys is increasing uniformly, which is not the case for other UFG alloys with eq(T) dependence peaking at 350-400 оС. Strain rate sensitivity coefficient of flow stress m is small and does not exceed 0.26-0.3 at 400-500 °C. In UFG alloys containing no scandium, m coefficient is observed to go down to 0.12-0.18 at 500 оС. It has been suggested that lower m values are driven by intensive grain growth and pore formation in large Al3X particles, which develop specifically at the ingot crystallization stage.

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Section: Alloysupporting

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Sc, Hf, and Yb Additions on Superplasticity of a Fine-grained Al-0.4%Zr Alloy

Нохрин¹,

Gryaznov²,

Shotin³

et al. 2022

Preprint

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Study of the Al–Sc Solid Solution Decomposition during Annealing of Strained Al–0.5% Mg–Sc Alloys

Shadrina,

Nokhrin,

Bobrov

et al. 2023

Phys. Metals Metallogr.

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Investigation of the Decomposition of Al–Sc Solid Solution during Annealing of Deformed Al–0.5% Mg–Sc Alloys

Shcherbak,

Kopylov,

Chuvil’deev

et al. 2023

Fizika metallov i metallovedenie

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Abstract—The results of studies of the kinetics of solid solution decomposition during firing of fine-grained conductive alloys Al–0.5% Mg–Sc with different scandium content are presented. The alloys were obtained by induction casting, and the fine-grained microstructure was formed using equal-channel angular pressing. The kinetics of the decomposition of a solid solution has been studied using methods for measuring electrical resistivity and microhardness. The results were analyzed using the Johnson–Mel–Avrami–Kolmogorov equation. It is shown that during the firing of fine-grained alloys, the separation of Al3Sc particles along the nuclei of lattice dislocations is observed, and discontinuous precipitation of scandium in aluminum also occurs.

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Investigation of Effect of Preliminary Annealing on Superplasticity of Ultrafine-Grained Conductor Aluminum Alloys Al-0.5%Mg-Sc

Cited by 4 publications

References 50 publications

Effect of Sc, Hf, and Yb Additions on Superplasticity of a Fine-grained Al-0.4%Zr Alloy

Effect of Sc, Hf, and Yb Additions on Superplasticity of a Fine-grained Al-0.4%Zr Alloy

Study of the Al–Sc Solid Solution Decomposition during Annealing of Strained Al–0.5% Mg–Sc Alloys

Investigation of the Decomposition of Al–Sc Solid Solution during Annealing of Deformed Al–0.5% Mg–Sc Alloys

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