The effect of ultrafine-grained states on superplastic behavior of Al-Mg-Si alloy

Bobruk, Elena V.; Safargalina, Zarema A.; Golubev, O. V.; Baykov, Danil; Kazykhanov, Vil U.

doi:10.1016/j.matlet.2019.126503

Cited by 15 publications

(6 citation statements)

References 14 publications

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“…HPT processing of the 6060 alloy samples resulted in the development of a homogenous UFG structure predominantly formed by HAGBs as demonstrated by EBSD microstructure analysis ( Figure 2 a,b) and consistent with earlier studies [ 29 ]. The average size of grains with close to equiaxial shape was 0.95 ± 0.05 µm, the shape factor ( Kf ) was 1.2, the volume fraction of HAGBs was 91%, the maximum misorientation angle of the grain boundaries was in the range of 50–60°, the average misorientation angle was 37.2°, and the average HAGBs misorientation angle was 38.7°.…”

Section: Resultssupporting

confidence: 90%

“…In the meantime, the recent works have shown that the formation of UFG states in Al alloys with a regulated distribution of alloying elements to form secondary hardening phases as well as segregations or interlayers along grain boundaries can lead to a unique combination of properties, when the strength, plasticity and electrical conductivity of the material simultaneously increase [ 20 , 21 , 22 ]. In addition, it was shown that grain refinement to the nanoscale range allows for realizing the SP effect at low and even ultralow (below 0.5 T m ) temperatures [ 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. Under such conditions, the thermally induced degradation of the UFG microstructure could be prevented, which would ensure maintaining high strength of Al alloys after SP forming.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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The paper reports on the features of low-temperature superplasticity of the heat-treatable aluminum Al-Mg-Si alloy in the ultrafine-grained state at temperatures below 0.5 times the melting point as well as on its post-deformation microstructure and tensile strength. We show that the refined microstructure is retained after superplastic deformation in the range of deformation temperatures of 120–180 °C and strain rates of 5 × 10–3 s–1–10–4 s–1. In the absence of noticeable grain growth, the ultrafine-grained alloy maintains the strength up to 380 MPa after SP deformation, which considerably exceeds the value (250 MPa) for the alloy in the peak-aged coarse-grain state. This finding opens pathways to form high-strength articles of Al-Mg-Si alloys after superplastic forming.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…The studies on the superplasticity characteristics of the UFG conductor aluminum alloys with ultra-low Mg content are almost absent. There are few papers on the superplasticity of UFG conductor 6061 aluminum alloys [ 31 , 32 , 33 ] and UFG Al-1%Zr alloys [ 34 ]. Numerous papers demonstrated the reduction of the grain sizes d down to nano- and submicron scale to result in higher strength, hardness, and fatigue resistance of the Al-Mg-Sc alloys [ 5 , 12 , 15 , 16 , 18 , 19 , 35 , 36 , 37 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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Effect of preliminary precipitation of Al3Sc particles on the characteristics of superplastic conductor Al-0.5%Mg-X%Sc (X = 0.2, 0.3, 0.4, 0.5 wt.%) alloys with ultrafine-grained (UFG) microstructure has been studied. The precipitation of the Al3Sc particles took place during long-time annealing of the alloys at 300 °C. The preliminary annealing was shown to affect the superplasticity characteristics of the UFG Al-0.5%Mg-X%Sc alloys (the elongation to failure, yield stress, dynamic grain growth rate) weakly but to promote more intensive pore formation and to reduce the volume fraction of the recrystallized microstructure in the deformed and non-deformed parts of the aluminum alloy specimens. The dynamic grain growth was shown to go in the deformed specimen material nonuniformly–the maximum volume fraction of the recrystallized microstructure was observed in the regions of the localization of plastic deformation.

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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%

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 effect of ultrafine-grained states on superplastic behavior of Al-Mg-Si alloy

Cited by 15 publications

References 14 publications

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

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

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

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

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