An investigation of thermal stability of structure and mechanical properties of Al-0.5Mg–Sc ultrafine-grained aluminum alloys

Чувильдеев, В. Н.; Shadrina, I. S.; Нохрин, А. В.; Копылов, В. И.; Bobrov, A. A.; Gryaznov, M. Yu.; Шотин, С. В.; Tabachkova, N. Yu.; Чегуров, М. К.; Мелехин, Н. В.

doi:10.1016/j.jallcom.2020.154805

Cited by 22 publications

(23 citation statements)

References 51 publications

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“…It allows suggesting that the submicron Al 3 Sc particles observed in the UFG alloys form during the bulk crystallization. The Al 3 Sc particles were coherent to the Al crystal lattice: the elastic strain fields were observed near the particles while the interphase boundaries between the Al 3 Sc particles and the Al crystal lattice were diffused ( Figure 5 e,f, see also [ 38 ]). No large elongated Al 3 Sc particles, the presence of which evidences the intermittent mechanism of the particle nucleation (see [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]) were found.…”

Section: Resultsmentioning

confidence: 99%

“…The Al-0.5 wt.%Mg alloys with different Sc contents (0.2, 0.3, 0.4, and 0.5 wt.%Sc) were the objects of investigation. The alloy specimens 22 × 22 × 150 mm in sizes were obtained by induction casting in INDUTHERM ® VTC-200 casting machine (Indutherm GmbH, Walzbachtal, Germany) according to the procedure described in [ 30 , 38 ]. After casting, the alloys were not subjected to homogenization.…”

Section: Methodsmentioning

confidence: 99%

“…It was shown in [ 30 ] that intensive pore formation in the Al 3 Sc incoherent particles may be one of the factors limiting the ultimate superplastic characteristics of the UFG Al-0.5%Mg-Sc alloys. It should be stressed here that the formation of the Al 3 Sc particles in the investigated UFG alloys at reduced temperatures goes via a discontinuous precipitation mechanism (see [ 4 , 30 , 38 ]) similar to the low-temperature discontinuous solid solution decomposition in Al-Zr alloys [ 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…[ 44 ] It is evident that due to the precipitation of S II particles at the grain boundaries, the thermal stability of this alloy is higher than in the case of the UFG Al−Mg−Sc alloy. [ 23 ]…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability and S‐Phase Evolution in Ultrafine‐Grained Al−Mg−Li Alloy Produced by Equal‐Channel Angular Pressing

2021

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Ultrafine‐grained (UFG) aluminum alloys produced by severe plastic deformation demonstrate high mechanical properties but low thermal stability, which can negatively affect their service characteristics. Herein, the thermal stability of structure and S‐phase (Al2LiMg) evolution in UFG Al−5.5Mg−2.2Li−0.12Zr alloy produced by equal‐channel angular pressing (ECAP) are studied during heating and direct annealing. It is found that the UFG structure with an average grain size of about 1 μm formed by ECAP is preserved at up to 410 °C (≈0.7 T m), with a significant decrease in dislocation density (from 5 × 109 to 3 × 108 cm−2) and the fraction of low‐angle grain boundaries (from 20% to 5%) at 380 °C. The dissolution of metastable semicoherent SI‐phase particles located within grains at 330 °C is accompanied by a corresponding increase in Mg content in solid solution. The transfer of Mg atoms from solid solution to grain boundaries at 380 °C with subsequent coalescent growth of SII particles leads to an increase in the volume fraction (from 3% to 12%) and size of the particles and to recrystallization in UFG Al−Mg−Li alloy at 415 °C.

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“…[ 11,12 ] On the contrary, Al alloys show excellent performances in the service conditions of hot/cold/cryogenic environment due to their excellent damage tolerance, fatigue and corrosion resistance, good workability, and low cost during manufacturing, which meet the requirement of long service life and high reliability in modern manufacturing industry. [ 13,14 ]…”

Section: Introductionmentioning

confidence: 99%

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

Xiong

Su²,

Kong

et al. 2021

Adv Eng Mater

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Weight reduction is a major trend in the development of automotive, marine, and aerospace industry. Al alloys are the ideal choice for the lightweight design because of their superior mechanical properties and small mass density. In recent years, research results have demonstrated that plastic processing at cryogenic temperature can improve the mechanical properties of Al alloys. Herein, the mechanical properties of Al alloys at cryogenic environment as well as at room temperature are compared, and then the main progress is introduced in the development of fabrication of high‐performance Al alloys using cryo‐forming methods, such as cryorolling, asymmetric cryorolling, cryo‐extrusion, and cryo‐forging, with subsequent heat treatment. The grain refinement mechanism and the strengthening mechanism of Al alloys during various cryo‐forming processes are discussed. Finally, the potential development prospects of future researches in this field are proposed.

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An investigation of thermal stability of structure and mechanical properties of Al-0.5Mg–Sc ultrafine-grained aluminum alloys

Cited by 22 publications

References 51 publications

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

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

Thermal Stability and S‐Phase Evolution in Ultrafine‐Grained Al−Mg−Li Alloy Produced by Equal‐Channel Angular Pressing

Development of High Performance of Al Alloys via Cryo‐Forming: A Review

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