Experimental study of the superplastic deformation mechanisms of high-strength aluminum-based alloy

Yakovtseva, O. A.; Ситкина, М. Н.; Котов, А. Д.; Rofman, O.V.; Mikhaylovskaya, A. V.

doi:10.1016/j.msea.2020.139639

Cited by 37 publications

(7 citation statements)

References 65 publications

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“… Superplastic behaviors of the HC‐LRMEA samples. a) engineering stress‐strain curves obtained under tensile loading at temperatures of 973, 1073, and 1173 K and strain rates of 10 −3 and 10 −2 s −1 ; b) images of representative specimens fractured under temperatures of 973, 1073, and 1173 K and a strain rate of 10 −2 s −1 ; c) stress–strain, σ–ε , curves and strain‐rate sensitivity ( m ) values obtained from strain‐rate jump tests conducted at 1173 K with 4 different strain rates of 5 × 10 −4 , 1 × 10 −3 , 5 × 10 −3 , and 1 × 10 −2 s −1 , where n = 1/ m is the stress exponent; d) the hardness distribution of the sample after coarse‐grained superplastic deformation; the inset in (d) illustrates the hardness test and morphology of hardness indentation; e) yield strength versus superplastic elongation at high strain rates (10 −2 s −1 ) of coarse‐grained superplastic magnesium alloys, [ 25 , 26 , 58 , 59 , 60 , 61 , 62 ] coarse‐grained superplastic aluminum alloys, [ 28 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 ] coarse‐grained niobium alloy, [ 73 ] coarse‐grained superplastic intermetallics, [ 74 , 75 , 76 ] and coarse‐grained superplastic titanium alloys. [ 9 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 ] …”

Section: Resultsmentioning

confidence: 99%

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Jia

et al. 2023

Advanced Science

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Superplastic metals that exhibit exceptional ductility (>300%) are appealing for use in high‐quality engineering components with complex shapes. However, the wide application of most superplastic alloys has been constrained due to their poor strength, the relatively long superplastic deformation period, and the complex and high‐cost grain refinement processes. Here these issues are addressed by the coarse‐grained superplasticity of high‐strength lightweight medium entropy alloy (Ti43.3V28Zr14Nb14Mo0.7, at.%) with a microstructure of ultrafine particles embedded in the body‐centered‐cubic matrix. The results demonstrate that the alloy reached a high coarse‐grained superplasticity greater than ≈440% at a high strain rate of 10−2 s−1 at 1173 K and with a gigapascal residual strength. A consecutively triggered deformation mechanism that sequences of dislocation slip, dynamic recrystallization, and grain boundary sliding in such alloy differs from conventional grain‐boundary sliding in fine‐grained materials. The present results open a pathway for highly efficient superplastic forming, broaden superplastic materials to the high‐strength field, and guide the development of new alloys.

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Section: Resultsmentioning

confidence: 99%

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Jia

et al. 2023

Advanced Science

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“…The bimodal particles size distribution with Al 3 Ni and Mg 2 Si particles of about 1–2 µm in size, and L1 2 precipitates with size of 10 nm contributed significantly to the grain refinement and provided high strain rate superplasticity for the studied alloys. The Al 3 Ni phase particles accumulate dislocations near interphase boundaries and provide the pronounced PSN effect during the superplastic flow [ 20 , 42 , 58 ]. Due to PSN mechanism, Al 3 Ni particles increased the dynamic recrystallization rate during the deformation and provided grain refinement.…”

Section: Discussionmentioning

confidence: 99%

“…Sc and Zr provide the formation of a high density core-shell L1 2 -strucured Al 3 (Sc,Zr) dispersoids [ 39 , 40 , 41 ]. These dispersoids result in strong Zener pining effect and inhibit grain growth, and, in addition, increase tensile properties at room temperature [ 42 , 43 , 44 , 45 , 46 , 47 , 48 ]. In novel alloys, the additions of Sc, as an expensive element, are reduced to 0.1 wt.%, while that of Zr is retained in a higher amount, 0.2 wt.% [ 32 , 49 , 50 ].…”

Section: Introductionmentioning

confidence: 99%

“…In novel alloys, the additions of Sc, as an expensive element, are reduced to 0.1 wt.%, while that of Zr is retained in a higher amount, 0.2 wt.% [ 32 , 49 , 50 ]. The bimodal distribution of the particles in the alloy’s structure provides a high strain rate superplasticity with strain rate sensitivity coefficient m above 0.3 for the AA5XXX- [ 24 , 30 , 51 ], AA7XXX- [ 29 , 30 , 42 , 52 ] and AA2XXX-types [ 27 , 34 ] alloys containing eutectic- and dispersoid-forming Fe [ 24 ], Ni [ 24 , 27 , 29 , 52 ], Ce [ 25 , 27 , 53 ], Y [ 34 ], Er [ 51 ], Mn [ 54 , 55 ], Cr [ 55 ], Zr [ 30 , 56 , 57 ], Sc [ 58 , 59 , 60 , 61 ]. The influence of the eutectic-forming and dispersoid-forming elements on the grain structure and superplastic deformation behavior of Al-Mg-Si type alloys is poorly studied.…”

Section: Introductionmentioning

confidence: 99%

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A High-Strain-Rate Superplasticity of the Al-Mg-Si-Zr-Sc Alloy with Ni Addition

et al. 2021

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The current study analyzed the effect of Ni content on the microstructure and superplastic deformation behavior of the Al-Mg-Si-Cu-based alloy doped with small additions of Sc and Zr. The superplasticity was observed in the studied alloys due to a bimodal particle size distribution. The coarse particles of eutectic origin Al3Ni and Mg2Si phases with a total volume fraction of 4.0–8.0% and a mean size of 1.4–1.6 µm provided the particles with a stimulated nucleation effect. The L12– structured nanoscale dispersoids of Sc- and Zr-bearing phase inhibited recrystallization and grain growth due to a strong Zener pinning effect. The positive effect of Ni on the superplasticity was revealed and confirmed by a high-temperature tensile test in a wide strain rate and temperature limits. In the alloy with 4 wt.% Ni, the elongation-to-failure of 350–520% was observed at 460 °C, in a strain rate range of 2 × 10−3–5 × 10−2 s−1.

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“…Both the mechanical properties (elongation, UTS, optimum forming temperatures, strain rate dependence, etc.) and the microstructural characteristics of superplastic aluminum alloys have been investigated [4][5][6][7][8][9]. Of particular interest, published research has shown the effectiveness and results of superplastically IOP Publishing doi:10.1088/1757-899X/1238/1/012012 2 deforming AA5083 sheets [10,11].…”

Section: Introduction To Superplastic Formingmentioning

confidence: 99%

Superplastic behaviour of AA5083 sheets in the presence of an oscillating load

Dastgiri

Fuerth

Kiawi

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The superplastic flow behaviour of AA5083 sheets was investigated at 450°C in the presence of a minor oscillating load. Uniaxial tensile specimens were tested to fracture at constant strain rates with a minor oscillating load superimposed onto the monotonically increasing tensile load. In each test, the oscillating load was applied as a sine wave having a constant amplitude of 0.5 N and a constant frequency. A series of tests was conducted in which the strain rate ranged from 0.001 to 0.4 s-1 and the frequency of the oscillating load ranged from 10 to 40 Hz. And other tensile specimens were subject to a constant mean load with a superimposed oscillating load until a predetermined elongation was reached. The flow behaviour of AA5083 showed a significant sensitivity to the oscillations although the tensile strengths remained practically unchanged. The addition of a minor oscillating load resulted in a 20% - 50% relative increase in fracture strain for the strain rates considered compared to the same tensile tests without oscillation. Finite element simulation of the tensile tests conducted at constant mean load with superimposed oscillations were carried out with LS-Dyna using material data obtained from the experiments. The numerical simulation results were compared with experimental results obtained under the same loading conditions to confirm their validity. The addition of a minor oscillating load led to greater uniformity in thickness in the specimen gauge. It can be concluded that superimposing a minor oscillating load during superplastic forming results in significantly greater deformation prior to fracture.

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Experimental study of the superplastic deformation mechanisms of high-strength aluminum-based alloy

Cited by 37 publications

References 65 publications

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

Efficient Coarse‐Grained Superplasticity of a Gigapascal Lightweight Refractory Medium Entropy Alloy

A High-Strain-Rate Superplasticity of the Al-Mg-Si-Zr-Sc Alloy with Ni Addition

Superplastic behaviour of AA5083 sheets in the presence of an oscillating load

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