Superplastic behaviour of Al-Mg-Zn-Zr-Sc-based alloys at high strain rates

Mikhaylovskaya, A. V.; Yakovtseva, O. A.; Чеверикин, В. В.; Котов, А. Д.; Portnoy, V.K.

doi:10.1016/j.msea.2016.02.061

Cited by 51 publications

(27 citation statements)

References 34 publications

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“…Strain rate > 1 × 10 −2 s −1 is suitable for industrial applications and would satisfy the current industrial manufacturing speed [83]. Mikhaylovskaya et al [84] evaluated the impacts of high strain rate on two Al-Zn-Mg-Zr-Sc alloys distinguished by the presence and absence of Al 9 FeNi particles. Alloy with Al 9 FeNi particles displayed elongation to failure up to 915% while alloy without Al 9 FeNi particles exhibited maximum elongation of 310% at strain rates up to 1 × 10 −2 s −1 and a temperature of 480 • C. The partially recrystallized structure was observed in alloy without Al 9 FeNi particles and superplastic indicators were significantly lower.…”

Section: Effect Of Strain Rate On the Superplasticity Of Al Alloysmentioning

confidence: 99%

Recent Development of Superplasticity in Aluminum Alloys: A Review

Bhatta

Pesin

Zhilyaev

et al. 2020

Metals

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Aluminum alloys can be used in the fabrication of intricate geometry and curved parts for a wide range of uses in aerospace and automotive sectors, where high stiffness and low weight are necessitated. This paper outlines a review of various research investigations on the superplastic behavior of aluminum alloys that have taken place mainly over the past two decades. The influencing factors on aluminum alloys superplasticity, such as initial grain size, deformation temperature, strain rate, microstructure refinement techniques, and addition of trace elements in aluminum alloys, are analyzed here. Since grain boundary sliding is one of the dominant features of aluminum alloys superplasticity, its deformation mechanism and the corresponding value of activation energy are included as a part of discussion. Dislocation motion, diffusion in grains, and near-grain boundary regions being major features of superplasticity, are discussed as important issues. Moreover, the paper also discusses the corresponding values of grain size exponent, stress exponent, solute drag creep and power law creep. Constitutive equations, which are essential for commercial applications and play a vital role in predicting and analyzing the superplastic behavior, are also reviewed here.

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Section: Effect Of Strain Rate On the Superplasticity Of Al Alloysmentioning

confidence: 99%

Recent Development of Superplasticity in Aluminum Alloys: A Review

Bhatta

Pesin

Zhilyaev

et al. 2020

Metals

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“…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

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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.

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“…e results proved that the FSP Al-Zn-Mg-Cu alloy possesses excellent thermal stability even up to incipient melting temperature; furthermore, a highest elongation of 3250% was obtained at 535°C and 0.01/s. Mikhaylovskaya et al [87] compared the superplastic deformation behavior of two aluminum AA7XXX alloys with Sc and Zr additions distinguished by the presence and absence of coarse eutectic Al 9 FeNi particles.…”

Section: Al-zn-mgmentioning

confidence: 99%

“…Generally speaking, superplastic deformation is mainly controlled by three mechanisms: grain-boundary sliding (GBS), dislocation slip/creep, and diffusion creep or directional diffusional flow [53]. Meanwhile, superplastic deformation is accompanied by various processes, for instance, grainboundary migrations and static/dynamic grain growth, grain rotation [80,99], recovery, recrystallisation, and polygonisation [87,100,101]. It is commonly accepted that GBS at low strain rates and creep by glide plus climb, also named slip creep, at high strain rates are the dominant controlling mechanisms that operate during high-temperature deformation of fine-grained metallic materials [102][103][104].…”

Section: Mechanisms Of Superplastic Deformationmentioning

confidence: 99%

“…Furthermore, the stability of cavity can be partially attributed to additional interfacial energy of Al 3 (Zr,Sc) particles. Besides nanoscale particles, there are also existence of other coarse particles (Al 9 FeNi, ∼1.8 μm, Figure 8 [87]) that a ect superplastic deformation. ese coarse particles can form extensive deformation zones during rolling or SPD process, which can accelerate nucleation at preheating and at superplastic deformation ascribed to particles stimulated nucleation (PSN) and lead to grain re nement.…”

Section: Precipitates Particlesmentioning

confidence: 99%

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A Review on Superplastic Formation Behavior of Al Alloys

Wang

et al. 2018

Advances in Materials Science and Engineering

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Superplastic formation technology is considered to be an effective and promising method to conquer formation difficulties of Al alloys, especially thin-walled or complex structure. In this paper, fundamentals of superplastic deformation of Al alloys are summarized and the superplastic deformation behaviors of main kinds of Al alloys are summarized and compared, including Al-Mg alloys, Al-Li alloys, and Al-Zn-Mg alloys as well as aluminum matrix composites. Then, the superplastic deformation mechanism for different Al alloys is thoroughly discussed. Last but not the least, the factors affecting the superplastic deformation process are fully analyzed.

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Superplastic behaviour of Al-Mg-Zn-Zr-Sc-based alloys at high strain rates

Cited by 51 publications

References 34 publications

Recent Development of Superplasticity in Aluminum Alloys: A Review

Recent Development of Superplasticity in Aluminum Alloys: A Review

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

A Review on Superplastic Formation Behavior of Al Alloys

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