Superplasticity of high-strength Al-based alloys produced by thermomechanical treatment

Котов, А. Д.; Mikhaylovskaya, A. V.; Kishchik, Mikhail S.; Tsarkov, A.A.; Aksenov, Sergey; Portnoy, V.K.

doi:10.1016/j.jallcom.2016.07.045

Cited by 47 publications

(23 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Decreasing mechanical strength at room temperature in the as-deformed state can also be attributed to dynamic recrystallisation. Dynamic recrystallisation is usually observed in materials with partially unrecrystallised or entirely banded grain structure before the start of superplastic deformation [39,[53][54][55][56][57]. Several works [15][16][17] observed the dynamic recrystallisation effect at superplastic deformation in near-α Ti alloys and in Ti 64 at low temperature of 750 °C [39].…”

Section: Superplastic Tensile Testsmentioning

confidence: 99%

Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy

Mikhaylovskaya

Mosleh

Котов

et al. 2017

Materials Science and Engineering: A

Self Cite

View full text Add to dashboard Cite

Superplastic deformation behaviour of conventional sheets of a near-α titanium alloy (Ti-2.5Al-1.8Mn) was studied by a step-by-step decrease of the strain rate and constant strain rate tests in a temperature range of 790-915 °C. The research found that superplastic deformation is possible in a temperature range of 815-890 °С and a constant strain rate range of 2 × 10 −4 to 1 × 10 −3 s −1 with elongation above 300% and m-index above 0.4. Also, the research identified the optimum superplastic temperature range of 815-850 °C and constant strain rate of 4 × 10−4 s−1 which provide a maximum elongation of 600-650%. Strain hardening is accelerated by dynamic grain growth at high temperatures of 865 and 890 °С. High dislocation activity is observed at superplastic flow in α-phase. Constitutive modelling of superplastic deformation behaviour is performed, and possible deformation mechanisms are discussed. It is suggested that grain boundary sliding between the α-grains is accommodated by a dislocation slip/creep mechanism.

show abstract

Section: Superplastic Tensile Testsmentioning

confidence: 99%

Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy

Mikhaylovskaya

Mosleh

Котов

et al. 2017

Materials Science and Engineering: A

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is suggested that low cavitation can be a result of a rapid accommodation of the GBS in a fine-grained structure, including the places near the coarse particles. As it was shown in [46,74], the superplastic properties of the Al-Zn-Mg-Cu-Zr-Sc alloy were also significantly improved due to the presence of the coarse Ni-bearing particles.…”

Section: Subsectionmentioning

confidence: 61%

“…The LAGB fraction significantly decreased and the HAGB proportionally increased to 82% after 0.69 of strain ( Figure 4b), and to 90% after 2.2 of strain ( Figure 4c). Thus, the strain softening at the beginning of the deformation is explained by the dynamic recrystallization process, which was stimulated by PSN in the presence of Al3Ni particles [45,46]. There was no significant grain growth at deformation; the mean grain size was 1.9 ± 0.4 µm after a strain of 0.69 and 2.4 ± 0.3 µm after failure at a strain of 2.2 ( Figure 4).…”

Section: Subsectionmentioning

confidence: 95%

“…The alloy is designed based on the principle of optimal microstructural heterogeneity [6,43]. An addition of nickel helps to create coarse particles of crystallization origin for PSN [44][45][46][47][48], and Sc and Zr provide the formation of nanoprecipitates for grain size stabilization via Zener pinning [48][49][50][51]. To minimize the alloy cost, the Sc content is chosen on the extremely low level of 0.06 wt.%.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High Strain Rate Superplasticity in Al-Zn-Mg-Based Alloy: Microstructural Design, Deformation Behavior, and Modeling

et al. 2020

View full text Add to dashboard Cite

Increasing the strain rate at superplastic forming is a challenging technical and economic task of aluminum forming manufacturing. New aluminum sheets exhibiting high strain rate superplasticity at strain rates above 0.01 s−1 are required. This study describes the microstructure and the superplasticity properties of a new high-strength Al-Zn-Mg-based alloy processed by a simple thermomechanical treatment including hot and cold rolling. The new alloy contains Ni to form Al3Ni coarse particles and minor additions of Zr (0.19 wt.%) and Sc (0.06 wt.%) to form nanoprecipitates of the L12-Al3 (Sc,Zr) phase. The design of chemical and phase compositions of the alloy provides superplasticity with an elongation of 600–800% in a strain rate range of 0.01 to 0.6/s and residual cavitation less than 2%. A mean elongation-to-failure of 400% is observed at an extremely high constant strain rate of 1 s−1. The strain-induced evolution of the grain and dislocation structures as well as the L12 precipitates at superplastic deformation is studied. The dynamic recrystallization at superplastic deformation is confirmed. The superplastic flow behavior of the proposed alloy is modeled via a mathematical Arrhenius-type constitutive model and an artificial neural network model. Both models exhibit good predictability at low and high strain rates of superplastic deformation.

show abstract

“…Aluminum and its alloys are widely used in the fields of shipbuilding, oceanography engineering, aerospace, and machine manufacturing because of its low density, low thermal expansion coefficient, high strength, and strain performance [1,2], which have drawn much attention from both researchers and engineers as promising materials for electrical appliances and the machinery industry [3][4][5][6][7][8]. Under certain circumstances, Al alloys possess some anticorrosion resistance because of the naturally The Al alloy samples were hand-cut and punched.…”

Section: Introductionmentioning

confidence: 99%

Perfect Combination of LBL with Sol–Gel Film to Enhance the Anticorrosion Performance on Al Alloy under Simulated and Accelerated Corrosive Environment

et al. 2019

View full text Add to dashboard Cite

Given their outstanding versatile properties, multilayered anticorrosion coatings have drawn great interest from researchers in the academic and engineering fields. However, the application of multilayered coatings is restricted by some limitations such as low interlayer compatibilities, the harsh preparation process, etc. This work introduced a composite film fabricated on a 2A12 aluminum alloy surface, including an anodic oxide film, a sol–gel film, and a layer-by-layer (LBL) self-assembling film from bottom to top. The microstructure and elemental characterization indicated that the finish of the coating with the LBL film resulted in a closely connected multilayered coating with a smoother surface. The anticorrosion performance was systematically evaluated in the simulated corrosive medium and neutral salt spray environment. The integrated coating with the LBL film presented an excellent anticorrosion ability with system impedance over 108 Ω·cm2 and a self-corrosion current density two orders of magnitude lower than that of the other coatings. After the acceleration test in a salt spray environment, the multilayered coatings could still show a good protective performance with almost no cracks and no penetration of chloride ions. It is believed that the as-constructed multilayered coating with high corrosive properties and a fine surface state will have promising applications in the field of anticorrosion engineering.

show abstract

Superplasticity of high-strength Al-based alloys produced by thermomechanical treatment

Cited by 47 publications

References 35 publications

Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy

Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy

High Strain Rate Superplasticity in Al-Zn-Mg-Based Alloy: Microstructural Design, Deformation Behavior, and Modeling

Perfect Combination of LBL with Sol–Gel Film to Enhance the Anticorrosion Performance on Al Alloy under Simulated and Accelerated Corrosive Environment

Contact Info

Product

Resources

About