The Microstructure and Strength of UFG 6060 Alloy after Superplastic Deformation at a Lower Homologous Temperature

Bobruk, Elena V.; Dolzhenko, Pavel; Murashkin, Maxim Yu.; Valiev, Ruslan Z.; Enikeev, Nariman A.

doi:10.3390/ma15196983

Cited by 7 publications

(5 citation statements)

References 42 publications

(65 reference statements)

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“…The formation of the UFG structure in the Al 2024 alloy with a mean grain size of 100 ± 7 nm and an aspect ratio of 1.2 in combination with nanoscale precipitates of the S′(Al 2 CuMg) phase, and segregation of alloying elements in the interiors and boundaries of grains allowed a high strength of 830 MPa to be achieved. The formation of this microstructure in Al alloys enables realizing high elongation values at unusually lower temperatures and high strain rates in the conditions of superplasticity [ 4 , 20 , 27 , 28 ]. According to [ 26 , 29 ], fine grains facilitate the grain-boundary sliding and dislocation accommodation; therefore, superplastic behavior can be observed at higher strain rates and lower temperatures.…”

Section: Discussionmentioning

confidence: 99%

Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains

et al. 2023

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This study aims to achieve an ultrafine-grained (UFG) Al 2024 alloy superplasticity at temperatures lower than the traditional ones for commercial Al alloys (400–500 °C). The UFG structure with a mean grain size of 100 nm produced in the alloy by high-pressure torsion at room temperature provided a very high strength—microhardness (HV0.1) of 286 ± 4, offset yield strength (σ0.2) of 828 ± 9 MPa, and ultimate tensile strength (σUTS) of 871 ± 6 MPa at elongation to failure (δ) of 7 ± 0.2%. Complex tensile tests were performed at temperatures from 190 to 270 °C and strain rates from 10−2 to 5 × 10−5 s−1, and the values of flow stress, total elongation and strain rate-sensitivity coefficient were determined. The UFG alloy was shown to exhibit superplastic behavior at test temperatures of 240 and 270 °C. For the first time, 400% elongation was achieved in the alloy at an unusually low temperature of 270 °C (0.56 Tm) and strain rate of 10−3 s−1. The UFG 2024 alloy after superplastic deformation was found to have higher strength (150–160 HV) than that after the standard strengthening heat treatment T6.

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Section: Discussionmentioning

confidence: 99%

Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains

et al. 2023

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“…Grain boundary sliding is the key superplastic deformation mechanism that accommodated by dislocation and diffusional creep, and grain rotation [1]- [5] . Thus, for a good superplastic properties fine-grained structure and movable high angle grain boundaries are required [6]- [10] . Grain refinement improves superplasticity, strain rates and elongations increase that favor formability [11]- [13] .…”

Section: Introductionmentioning

confidence: 99%

Friction stir processing to improve grain refinement and superplasticity of Al-Mg-Mn-Cr alloy

Кищик

2023

Superplasticity in Advanced Materials

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Abstract. In this study the Al-4.8Mg-1.0Mn-0.15Cr alloy was frictionally stir processed in order to enhance grain refinement effect and superplastic properties. The microstructure after friction stir processing (FSP) was analyzed using light, scanning and transmission electron microscopies. An additional cold rolling (50%) was performed after the FSP, and a comparative study in terms of microstructure and superplasticity was done between the samples processed using hot rolling and further FSP, FSP and cold rolling, and cold rolling without FSP. The superplastic properties were studied at temperatures of 450 and 500 °C with constant strain rates of 1×10-2 and 1×10-2 s-1. The treatment regime including FSP and further cold rolling improved superplasticity due to fine-grained and homogeneous grain structure with a good thermal stability. At a temperature of 500°C and strain rates of 1×10-3 - 1×10-2 s-1 the alloy demonstrated 330-450 % elongation with a flow stress of 10-20 MPa.

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“…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%

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

Нохрин¹,

Gryaznov²,

Shotin³

et al. 2022

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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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The Microstructure and Strength of UFG 6060 Alloy after Superplastic Deformation at a Lower Homologous Temperature

Cited by 7 publications

References 42 publications

Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains

Low-Temperature Superplasticity and High Strength in the Al 2024 Alloy with Ultrafine Grains

Friction stir processing to improve grain refinement and superplasticity of Al-Mg-Mn-Cr alloy

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

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