Multi Directional Forging of 2024 Al Alloy After Different Heat Treatments: Microstructural and Mechanical Behavior

Asadi, Saeed; Kazeminezhad, M.

doi:10.1007/s12666-016-0967-8

Cited by 14 publications

(5 citation statements)

References 41 publications

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“…The fine-grained zone increased with increasing cumulative strain, but IMF with strain of ∑ e = 6 in a studied temperature range did not produce a homogeneous grain structure in the studied alloy. Similar inhomogeneity was observed in other Al- and Mg-based alloys, due to strain inhomogeneity at compression [19,26,31,34,35,39]. Despite the effect of grain inhomogeneity, applying IMF instead of hot or warm rolling helped to form a fine and homogenous grain structure in cold-rolled and subsequently recrystallized sheets.…”

Section: Discussionsupporting

confidence: 66%

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Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

et al. 2018

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The effect of isothermal multidirectional forging (IMF) on the microstructure evolution of a conventional Al–Mg-based alloy was studied in the strain range of 1.5 to 6.0, and in the temperature range of 200 to 500 °C. A mean grain size in the near-surface layer decreased with increasing cumulative strain after IMF at 400 °C and 500 °C; the grain structure was inhomogeneous, and consisted of coarse and fine recrystallized grains. There was no evidence of recrystallization when the micro-shear bands were observed after IMF at 200 and 300 °C. Thermomechanical treatment, including IMF followed by 50% cold rolling and annealing at 450 °C for 30 min, produced a homogeneous equiaxed grain structure with a mean grain size of 5 µm. As a result, the fine-grained sheets exhibited a yield strength and an elongation to failure 30% higher than that of the sheets processed with simple thermomechanical treatment. The IMF technique can be successfully used to produce fine-grained materials with improved mechanical properties.

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Section: Discussionsupporting

confidence: 66%

“…The principle of these methods is based on cyclic rotations of the sample by 90 degrees, to change the strain axis [28,29,30,31,32,33]. The strain per pass varies in a range of 0.2 to 0.7 [31,32,33,34,35,36,37,38,39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

et al. 2018

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“…A specific feature of the MAO process is the use of valve materials on which oxide films (formed electrochemically) have unipolar or asymmetric conductivity in the metal -oxide -electrolyte (MOE) system [28,29]. In this case, the positive potential on the metal (on which the anodic oxide film is formed) corresponds to the blocking or reverse direction, i. e., the system works similarly to a semiconductor valve.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

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Belozerov

et al. 2020

EEJET

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The effect of electrolysis conditions with different electrolyte compositions on the growth kinetics, phase-structural state, and hardness of coatings obtained by microarc oxidation (MAO) on the D16 aluminum alloy (base-aluminum, main impurity Cu) was studied. An analysis of the results obtained showed that the choice of the type of electrolyte and the conditions for the MAO process makes it possible to vary the growth kinetics and phase-structural state of the coating on the D16 aluminum alloy within a wide range. For all types of electrolytes, with an increase in the content of KOH, Na 2 SiO 3 , or KOH+Na 2 SiO 3 , the growth rate of MAO coatings increases. It was found that in MAO coatings obtained in an alkaline (KOH) electrolyte, a two-phase (γ−Al 2 O 3 and α−Al 2 O 3 phases) crystalline state is formed. An increase in the KOH concentration leads to an increase in the relative content of the α-Al 2 O 3 phase (corundum). During the formation in a silicate electrolyte, the phase composition of MAO coatings with an increase in the content of liquid glass (Na 2 SiO 3) changes from a mixture of the γ−Al 2 O 3 phase and mullite (3Al 2 O 3 •2SiO 2) to an X-ray amorphous phase. The use of a complex electrolyte leads to a two-phase state of the coating with a large (compared to an alkaline electrolyte) shift of the γ−Al 2 O 3 →α−Al 2 O 3 transformation towards the formation of the α−Al 2 O 3 phase. It was determined that the value of hardness correlates with the content of the α−Al 2 O 3 phase in the MAO coating, reaching the maximum value of 1620 kg/mm 2 at the highest content (about 80 vol. %) of the α−Al 2 O 3 phase. Two types of dependences of the coating thickness on the amount of electricity passed were revealed. For the amount of passed electricity 10-50 A-h/dm 2 , the thickness dependence is determined as 4.2 µm/(A-h/dm 2), which suggests the basic mechanism of electrochemical oxidation during the formation of a coating. For the amount of electricity transmitted 50-120 A-hour/ dm 2 , the thickness dependence is determined by a much smaller value of 1.1 µm/(A-hour/dm 2). This suggests a transition to a different mechanism of coating formation − the formation of a coating with the participation of electrolysis components

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“…and their alloys [17]. It is noteworthy that valve metals are those whose oxide films (formed electrochemically) have unipolar or asymmetric conductivity in the metal-oxide-electrolyte (MOE) system [18]. In this case, the positive potential of the metal (on which the anodic oxide film is formed) corresponds to the locking or reverse direction, i. e., the system works analogously to a semiconductor valve.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

Belozerov

Sоbоl

Mahatilova

et al. 2017

EEJET

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Multi Directional Forging of 2024 Al Alloy After Different Heat Treatments: Microstructural and Mechanical Behavior

Cited by 14 publications

References 41 publications

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition

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Multi Directional Forging of 2024 Al Alloy After Different Heat Treatments: Microstructural and Mechanical Behavior

Cited by 14 publications

References 41 publications

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

Effect of Multidirectional Forging on the Grain Structure and Mechanical Properties of the Al–Mg–Mn Alloy

A study of the phase-structural engineering possibilities of coatings on D16 alloy during micro-arc oxidation in electrolytes of different types

The influence of the conditions of microplasma processing (microarc oxidation in anode­cathode regime) of aluminum alloys on their phase composition

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The influence of the conditions of microplasma processing (microarc oxidation in anodecathode regime) of aluminum alloys on their phase composition