Effect of equal-channel angular pressing and annealing conditions on the texture, microstructure, and deformability of an MA2-1 alloy

Serebryany, V. N.; Ivanova, T.; Копылов, В. И.; Dobatkin, S. V.; Pozdnyakova, N. N.; Pimenov, V. A.; Савелова, Т.И.

doi:10.1134/s0036029510070128

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…We should expect that with heating, such microstructure is transformed into the equilibrium HAGBs with subsequent growth of the average grain size, which should further enhance the low-temperature ductility of alloys after ECAP due to the release of new dislocations from grain boundaries and increase their mean free path length. Indeed, such an effect to further enhance plasticity after annealing ECAP-samples of magnesium alloys has been found by us and other investigators [5,[13][14][15]16]. For example, the dependence of elongation on the annealing temperature is a function with a maximum at 200 ° C for the alloy AZ31, previously subjected to ECAP at 220 ° C along the 4Bc route [16].…”

Section: Structure Parameter Effectssupporting

confidence: 55%

“…However, sometimes, the followed annealing does not lead to further improve of the alloy ductility [6]. On the other hand, annealing of magnesium alloys, which provides grain growth to its original state before ECAP, also leads to an increase in ductility [5,14,15,17]. These results are difficult to explain only by the nature of grain boundaries and the effect of grain refinement.…”

Section: Structure Parameter Effectsmentioning

confidence: 99%

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The Role of Structure and Texture Factors in the Ductility and Deformability Improving of Magnesium Alloys Subjected to ECAP

Serebryany¹,

Добаткин²

2011

MSF

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Equal channel angular pressing (ECAP) in magnesium alloys due to the severe plastic shear deformations provides both grain refinement and the slope of the initial basal texture at 40-50 ° to the pressing direction. Such changes in microstructure and texture contribute to the improvement of low-temperature ductility and deformability of the alloys. On the basis of analysis of data from various researchers, the main structure and texture factors affecting on the ductility increase of the Mg-Al-Zn-Mn alloys were defined.

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Section: Structure Parameter Effectssupporting

confidence: 55%

Section: Structure Parameter Effectsmentioning

confidence: 99%

The Role of Structure and Texture Factors in the Ductility and Deformability Improving of Magnesium Alloys Subjected to ECAP

Serebryany¹,

Добаткин²

2011

MSF

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“…Knowing the Eulerian angles and the volume frac tions of orientations, we were able to estimate the gen eralized Schmid and orientation factors [6,7] (Table 1) We can draw the conclusion from Table 1 that the activity of basal slip increases after ECAP (orientation factors for basal slip almost two times lower than those in the initial state), which should have a positive effect on the ductility of the alloy. The given orientation fac tors suggest that the activity of the remaining deforma tion systems varies only slightly during ECAP and sub sequent annealing.…”

Section: Resultsmentioning

confidence: 99%

“…Grain refinement and the formation of an tilted scattered basal texture in magnesium alloys during equal channel angular pressing (ECAP) at tempera tures of 200-250°C favors a noticeable increase in their ductility at a slight increase in the strength prop erties [1][2][3][4][5][6][7]. The softening effect of texture leads to almost complete neutralization of the hardening effect produced by grain refinement to 2-3 μm in these alloys.…”

Section: Introductionmentioning

confidence: 95%

Structure, texture, and mechanical properties of an MA2-1hp magnesium alloy after two-stage equal-channel angular pressing and intermediate annealing

et al. 2015

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The effect of two stage equal channel angular pressing (ECAP) on the microstructure, the tex ture, and the mechanical properties of an MA2 1hp magnesium alloy is analyzed. ECAP leads to the forma tion of a submicrocrystalline structure with an average grain size of 640 nm, which includes Mg 17 Al 12 phase particles with an average grain size of 240 nm and a volume fracture of 5.5%. A scattered tilted basal texture forms after ECAP, and its experimental pole figures are used for calculating orientation distribution functions and determining the volume fractions of the main orientations and the Schmid factors for different deforma tion systems. An increased activation of basal slip is found after both the first and the second stages of ECAP. As a result of two stage ECAP, the strength properties of the alloy that correspond to the minimum acceptable values achieved by direct compression are obtained. Ductility is 44 and 18% after the first stage of ECAP plus subsequent annealing and after the second stage, respectively, which is almost four and two times higher than the initial value. The resulting strength mechanical properties of the alloy after the first and the second ECAP stages are analyzed using the Hall-Petch relation.

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“…As a result, the effect of the ductility increasing of magnesium alloys after deformation of these methods is limited. Equal channel angular pressing (ECAP) offers additional opportunities to improve ductility of magnesium alloys due to the simultaneous grain refinement and the radical change of texture that promote activation of basal slip as such other slip systems [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Texture and Structure Study of AZ41 Alloy after ECAP and Annealing

Serebryany

Djyakonov

Салищев

et al. 2013

MSF

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Equal channel angular pressing (ECAP) of magnesium alloys dramatically effects the texture and structure of the alloys due to processes of severe plastic deformation and dynamic recrystallization. Changes in texture, structure and tensile properties of AZ41 alloy after ECAP by Bc regime with 4 passes at a temperature of 245° C and subsequent annealing were studied. Evaluation of texture and structure was performed using the orientation distribution function (ODF) restore from the X-ray direct pole figures and the large number of individual orientations measured by the EBSD method. After ECAP the structure of the dynamically recrystallized fine grains with an average size of about 2,9 μm was revealed. The ratio of the volume fraction of low angle grain boundaries (LAGBs) to the high angle grain boundaries (HAGBs) constituted as 1:3. The formation of few basal texture, tilted by 45 ÷ 55 ° to the pressing direction was also found. Subsequent annealing increases the grain size to 10 μm, the fraction of HAGBs - up to 85% and practically does not change the texture type. These changes in structural parameters improve considerably the low-temperature ductility of AZ41 alloy.

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Effect of equal-channel angular pressing and annealing conditions on the texture, microstructure, and deformability of an MA2-1 alloy

Cited by 8 publications

References 9 publications

The Role of Structure and Texture Factors in the Ductility and Deformability Improving of Magnesium Alloys Subjected to ECAP

The Role of Structure and Texture Factors in the Ductility and Deformability Improving of Magnesium Alloys Subjected to ECAP

Structure, texture, and mechanical properties of an MA2-1hp magnesium alloy after two-stage equal-channel angular pressing and intermediate annealing

Texture and Structure Study of AZ41 Alloy after ECAP and Annealing

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