Effect of Radial-Shear Rolling on the Structure and Hardening of an Al–8%Zn–3.3%Mg–0.8%Ca–1.1%Fe Alloy Manufactured by Electromagnetic Casting

Gamin, Yu. V.; Белов, Н. А.; Akopyan, Т. К.; Тимофеев, В. Н.; Cherkasov, S. O.; Motkov, M. M.

doi:10.3390/ma16020677

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…The as-received state was pressed by equal-channel angular pressing (ECAP) at room temperature up to 4 passes to obtain the microstructure with various number of high-angle and low-angle grain boundaries. The as-received state was also processed at room temperature by radial shear rolling which is a variant of helical rolling [8]. For this reason, the specimens were marked by HR.…”

Section: Methodsmentioning

confidence: 99%

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Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Král,

Dvořák,

Kvapilová

et al. 2024

Crystals

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This work investigates the creep behavior of severely deformed commercial aluminum. The commercial aluminum was processed by helical rolling (HR) and equal-channel angular pressing (ECAP) at room temperature. During these processes, the equivalent strain up to about 4 was imposed into the as-received material. The creep testing at 200 °C revealed that HR and ECAP significantly increased the time to fracture compared to the as-received material. The stress dependences showed that the value of stress exponent n decreased with the value of the imposed strain. The stress-change tests showed that as-received and severely deformed states exhibited different recovery rates after unloading. The microstructure analysis showed that creep behavior was influenced by the microstructure formed during severe plastic deformation. The relationships between creep behavior and microstructure in the investigated states are discussed.

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Section: Methodsmentioning

confidence: 99%

“…The microstructure can contain various proportions of LAGBs and HAGBs, depending on the level of imposed plastic strain. Many methods of SPD are known at present time, e.g., high pressure torsion (HPT) [1], equal-channel angular pressing (ECAP) [2], radial shear rolling (RSR) [8][9][10], twist extrusion (TE) [11], etc.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Král,

Dvořák,

Kvapilová

et al. 2024

Crystals

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“…However, recent studies of these alloys show that the addition of eutectic-forming elements, such as Ni [2,3] and Ca [4], improves the casting properties due to an increase in the fraction of eutectic phases (Al 3 Ni and (Al,Zn) 4 Ca, respectively). Furthermore, these additives promote the formation of phase compositions which significantly increase the permissible concentration of iron impurities in the alloy due to the formation of compact eutectic crystals of the Al 9 FeNi and Al 10 CaFe 2 phases [2][3][4][5][6][7]. A striking example of the implementation of the above approach is the design of new high-tech alloys named "nikalin" [2,6].…”

Section: Introductionmentioning

confidence: 99%

“…A striking example of the implementation of the above approach is the design of new high-tech alloys named "nikalin" [2,6]. These are high-strength Al-Zn-Mg-Ni-Fe system alloys which can be used in more conventional applications (casting [2,3], rolling [5,6], etc.) and even in additive technologies [7] as a substitute for commonly used alloys.…”

Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation of Al-Zn-Mg-Ni-Fe “Nikalin” Alloys

Letyagin,

Akopyan,

Sokorev

et al. 2024

Metals

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Ceramic coatings were formed on the surface of as-cast Al5.2Zn1.7Mg0.4Ni0.3Fe and heat-treated Al7.0Zn2.7Mg0.5Ni0.4Fe “nikalin” aluminum alloys by using the plasma electrolytic oxidation (PEO) technique in a silicate–alkaline electrolyte. Uniform coatings containing a minimum number of defects and consisting predominantly of a γ-Al2O3 phase were synthesized on the surface of both Al-Zn-Mg-Ni-Fe alloys. The coatings had a microhardness of 660–1200 HV, which is 3.5–11 times higher than that of the “bare” as-cast and heat-treated alloy. The coating on the Al5.2Zn1.65Mg0.4Ni0.3Fe alloy had the highest peak hardness, which is probably caused by the lower residual alloying elements Zn and Mg in the coating bulk. As a consequence, the PEO coating with the highest hardness synthesized on the as-cast alloy exhibited a lower wear rate as compared to the heat-treated alloy. The polarization curves in 3.5% NaCl show that the PEO coatings in all cases reduced the corrosion current density and shifted the corrosion potential toward positive values, thus indicating protective properties of the coatings. The corrosion rate of the as-cast and heat-treated Al-Zn-Mg-Ni-Fe alloys increased noticeably by about 3.7–5.7 times after PEO treatment. A relationship between the residual alloying elements Zn and Mg in the bulk of the PEO coatings and corrosion resistance was established.

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New high-strength aluminum alloy on the basis of secondary materials

Barykin,

Naumova,

Belov

et al. 2024

VESTNIK of Samara University. Aerospace and Mechanical Engineer

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Six alloys of the Al-Ca-Zn-Mg system with additives of copper, manganese, iron and silicon were studied in order to simulate the composition of an alloy prepared on the basis of secondary aluminum. The alloys were made in the form of ingots with dimensions of 140×200×20 mm that were subjected to subsequent deformation treatment by hot rolling from a thickness of 20 mm to a thickness of 1 mm, and then cold-rolled sheets with a thickness of 0.5 mm were obtained from them. A cylindrical ingot with a diameter of 40 mm and a length of 200 mm was also made. Rods with a diameter of 14 mm were obtained from it by radial displacement rolling. Hot deformation treatment of ingots was carried out at a temperature of 450°C without prior homogenizing annealing. Cast and deformed specimens were examined using optical and scanning electron microscopy. No coarse acicular particles of iron- and silicon-containing phases, as well as any other coarse intermetallides, were found in the microstructure of the specimens. Mechanical tests were carried out using the method of uniaxial tension of deformed semi-finished products that were not subjected to additional strengthening heat treatment. According to the test results, an alloy of optimal composition was selected. The possibility of obtaining products from high-strength and high-tech aluminum-calcium alloy based on secondary raw materials without the use of homogenization and quenching was established.

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Effect of Radial-Shear Rolling on the Structure and Hardening of an Al–8%Zn–3.3%Mg–0.8%Ca–1.1%Fe Alloy Manufactured by Electromagnetic Casting

Cited by 4 publications

References 32 publications

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Enhancement of Creep Lifetime of Aluminum through Severe Plastic Deformation

Plasma Electrolytic Oxidation of Al-Zn-Mg-Ni-Fe “Nikalin” Alloys

New high-strength aluminum alloy on the basis of secondary materials

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