Superplasticity of friction-stir welded Al–Mg–Sc sheets with ultrafine-grained microstructure

Malopheyev, Sergey; Mironov, S.; Vysotskiy, Igor; Kaibyshev, Rustam

doi:10.1016/j.msea.2015.09.106

Cited by 40 publications

(21 citation statements)

References 31 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%

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%

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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“…Сварка трением с перемешиванием является современным и перспективным способом изготовления корпусных деталей ракетно-космической техники, автомобильных цистернполуприцепов, вагонов поездов и т.д. [1][2][3][4][5][6][7][8][9][10]. Ключевой особенностью данного процесса является термомеханическое воздействие инструмента на свариваемый материал.…”

Section: институт физики прочности и материаловедения со ран томск unclassified

Vliyanie parametrov protsessa treniya na strukturu deformirovannykh sloev posle adgezionnogo friktsionnogo kontakta s ultrazvukovym vozdeystviem

2018

Perspektivnye Materialy S Ierarkhicheskoy Strukturoy Dlya Novykh Tekhnologiy I Nadezhnykh Konstruktsiy» I «Khimiya Nefti I Gaza

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“…Fine-grained Al-Sc and Al-Zr aluminum alloys are currently a focus of many research efforts. These alloys have both higher strength and plasticity at room temperature [1,2,3,4,5,6,7,8,9] and exhibit superplasticity at elevated deformation temperatures [10,11,12,13,14,15]. Note that the precipitation of Al 3 (Sc,Zr) particles from an Al-(Sc,Zr) solid solution increases conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…A common solution to this problem is to dope fine-grained Al-Sc(Zr) aluminum alloys with magnesium (1.5–6 wt.%), which decreases the grain-boundary diffusion coefficient for aluminum [4,9,10,11,12,13,14,15,20,21,28,33,34,35,36,37,38]. This, in turn, shrinks the deposited Al 3 Sc(Zr) particles, facilitates the formation of a finer-grained structure during annealing, and additionally increases the strength and hardness of Al-Sc(Zr) aluminum alloys [10,21,28,34].…”

Section: Introductionmentioning

confidence: 99%

Study of Structure and Mechanical Properties of Fine-Grained Aluminum Alloys Al-0.6wt.%Mg-Zr-Sc with Ratio Zr:Sc = 1.5 Obtained by Cold Drawing

et al. 2019

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The thermal stability of a fine-grained (FG) aluminum wire has been studied in Al-0.6Mg-Zr-Sc alloys with various scandium and zirconium contents. Specimens were obtained by induction casting followed by cold deformation. The FG alloys have been demonstrated to have high thermal stability of the structure and properties due to the annealing pretreatment (320 °C, 2 h, before drawing), which results in deposition of Al3(ScxZr1−x) intermetallic particles. It has been determined that following a prolonged annealing treatment (400 °C, 100 h), the alloys retain a uniform fine-grained structure with an average grain size of 2.4–2.8 μm whereas their microhardness measures 405–440 MPa.

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Superplasticity of friction-stir welded Al–Mg–Sc sheets with ultrafine-grained microstructure

Cited by 40 publications

References 31 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

Vliyanie parametrov protsessa treniya na strukturu deformirovannykh sloev posle adgezionnogo friktsionnogo kontakta s ultrazvukovym vozdeystviem

Study of Structure and Mechanical Properties of Fine-Grained Aluminum Alloys Al-0.6wt.%Mg-Zr-Sc with Ratio Zr:Sc = 1.5 Obtained by Cold Drawing

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