Superplasticity of ultrafine-grained Al–Mg–Sc–Zr alloy

Yuzbekova, Diana; Mogucheva, Anna; Kaibyshev, Rustam

doi:10.1016/j.msea.2016.08.074

Cited by 29 publications

(16 citation statements)

References 68 publications

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“…However, Al-Mg alloys have unstable grain structures at high temperatures after SPD processing and any benefits in the mechanical properties attained by grain refinement are lost through early recrystallization [7,[21][22][23][24]. With the aim of improving the grain boundary stability of Al alloys processed by SPD, the materials may be alloyed with Sc additions because Al 3 Sc dispersoids are effective in pinning the grain boundaries and retaining a UFG structure even at elevated temperatures [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractExperiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 -4 to ~10 3 s -1 .The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarsegrained material to superplasticity in the UFG alloy.

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Section: Introductionmentioning

confidence: 99%

“…Although the superplastic properties of Al-Mg-Sc alloys were studied extensively after ECAP [24,25,28,[32][33][34][35][36][37] and HPT [38][39][40][41], there are only limited studies documenting the mechanical properties of UFG Al-Mg-Sc alloys at ambient temperatures [42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

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“…From a practical point of view, a UFG structure can be easily produced in aluminum alloys by equal channel angular pressing (ECAP) [1]. This technique can be scaled up fairly easily for the fabrication of high-volume billets with commercially viable dimensions [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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Abstract:The effect of post-deformation solution treatment followed by water quenching and artificial aging on microstructure and mechanical properties of an Al-Li-Mg-Sc-Zr alloy subjected to equal-channel angular pressing (ECAP) was examined. It was shown that the deformed microstructure produced by ECAP remains essentially unchanged under solution treatment. However, extensive grain refinement owing to ECAP processing significantly affects the precipitation sequence during aging. In the aluminum-lithium alloy with ultrafine-grained (UFG) microstructure, the coarse particles of the S 1 -phase (Al 2 LiMg) precipitate on high-angle boundaries; no formation of nanoscale coherent dispersoids of the δ -phase (Al 3 Li) occurs within grain interiors. Increasing the number of high-angle boundaries leads to an increasing portion of the S 1 -phase. As a result, no significant increase in strength occurs despite extensive grain refinement by ECAP.

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“…Al-Mg alloys are widely used in transportation industry due to their high strength, good formability and weldability and favorable corrosion resistance [1][2][3][4]. However, addition of more than 3 wt.% Mg can cause magnesium to preferably diffuse to the (sub)grain boundaries and form β-phase Al 3 Mg 2 [5,6], which is more susceptible to the corrosion than the Al-Mg matrix, and sensitization -intergranular corrosion and stress corrosion cracking -may occur at low and moderate temperatures, leading to exfoliation corrosion [7].…”

Section: Introductionmentioning

confidence: 99%

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

et al. 2018

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The Al-Mg-Sc alloys are used in aerospace and shipbuilding industry due to their good mechanical properties such as corrosion resistance, weldability and possibility for superplastic forming. Addition of Sc with Zr may further lead to enhancement of their performance by precipitation of coherent particles of Al3(Sc,Zr) phase which are known to stabilize the microstructure and hinder the recrystallization. The role of the material processing on the microstructure and mechanical properties evolution was studied by means of transmission electron microscopy, scanning electron microscopy and resistivity measurement. The Al-Mg-Sc-Zr alloy was manufactured by two different manners-conventional casting and twin-roll casting and subjected to deformation by equal-channel angular pressing. The shape and nature of the grains significantly influenced precipitation of β-phase Al3Mg2, which may be detrimental for such kind of materials in the terms of corrosion resistance. The worst properties exhibited the conventionally cast and rolled material with a pancake grain structure where the β-phase particles forms as continuous layer along the (sub)grain boundaries.

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Superplasticity of ultrafine-grained Al–Mg–Sc–Zr alloy

Cited by 29 publications

References 68 publications

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Transmission Electron Microscopy Study of Microstructure Evolution of Al-Mg-Sc Alloy after Annealing at 120°

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