Dynamic recrystallization in AZ31 magnesium alloy

Fatemi-Varzaneh, S.M.; Zarei-Hanzaki, A.; Beladi, Hossein

doi:10.1016/j.msea.2006.11.095

Cited by 320 publications

(107 citation statements)

References 8 publications

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“…However, relation between inverse grain size and strain is not linear, and after reaching a maximum point, the size of recrystallized grains remains constant despite further deformation. [19,20] Similarly in ECAP, after reaching a minimum mean grain size for a given temperature, subsequent passes do not lead to further grain refinement but only to microstructural homogenization. The multiscale cellular automata finite element (CAFE) model of microstructural evolution during ECAP of magnesium alloys based on DRX approach was developed by the authors of this article, and the numerical results were found to be in good agreement with experiments.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Gzyl

Rosochowski

Pesci

et al. 2013

Metall Mater Trans A

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Incremental equal channel angular pressing (I-ECAP) is a severe plastic deformation process used to refine grain size of metals, which allows processing very long billets. As described in the current article, an AZ31B magnesium alloy was processed for the first time by three different routes of I-ECAP, namely, A, B C , and C, at 523 K (250°C). The structure of the material was homogenized and refined to~5 microns of the average grain size, irrespective of the route used. Mechanical properties of the I-ECAPed samples in tension and compression were investigated. Strong influence of the processing route on yield and fracture behavior of the material was established. It was found that texture controls the mechanical properties of AZ31B magnesium alloy subjected to I-ECAP. SEM and OM techniques were used to obtain microstructural images of the I-ECAPed samples subjected to tension and compression. Increased ductility after I-ECAP was attributed to twinning suppression and facilitation of slip on basal plane. Shear bands were revealed in the samples processed by I-ECAP and subjected to tension. Tensioncompression yield stress asymmetry in the samples tested along extrusion direction was suppressed in the material processed by routes B C and C. This effect was attributed to textural development and microstructural homogenization. Twinning activities in fine-and coarsegrained samples have also been studied.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Gzyl

Rosochowski

Pesci

et al. 2013

Metall Mater Trans A

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“…To date, the grain refinement due to DRX during hot deformation has been demonstrated in conventional Mg-Al-Zn alloys. [15][16][17][18][19][20][21][22][23][24][25][26][27][28] It has been reported that dynamically recrystallized grain size (DRX grain size) decreases with an increase of Zener-Hollomon parameter (Z-parameter) 29) in several magnesium alloys. 19,24,27,30,31) Watanabe et al have reported that there is initial grain sizes dependence on DRX grain size in AZ61 magnesium alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Initial Grain Size on Dynamically Recrystallized Grain Size in AZ31 Magnesium Alloy

et al. 2008

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The effect of initial grain size on dynamically recrystallized grain size (DRX grain size) is examined in AZ31 magnesium alloy with four kinds of initial grain sizes. When the average grain size after the high-temperature compression test is plotted against Zenner-Hollomon parameter (Z-parameter), initial grain size dependence on DRX grain size appears only in the specimen with large initial grain size in the low Z region, but not in the specimen with small grain size or in high Z region. When the grain size measured only in recrystallized region is plotted against Z-parameter, initial grain size dependence on DRX grain size does not appear. From these results, it is concluded that there is no initial grain size dependence on DRX grain size when the DRX proceeds to some degree, because the DRX grain size becomes constant for a given Zvalue. The initial grain size dependence on DRX grain size observed in the low Z region would be related to the rotation of basal plane perpendicular to the compression axis during deformation before the DRX grains have been developed sufficiently.

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“…2,19,20 In order to investigate the effect of extrusion ratio on the subsequent plastic deformation, warm forging process is carried out with the three extruded Mg bars with three extrusion ratios of 9:1, 16:1, and 25:1.…”

Section: Warm Forging Of Extruded Barmentioning

confidence: 99%

Effect of the extrusion ratio on the mechanical properties of as-forged Mg-8Al-0.5Zn alloy

Lee

Yoon

2015

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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This paper demonstrates the effect of the extrusion ratio on the mechanical properties of the as-forged Mg-8Al-0.5Zn alloy. Three extruded Mg bars with the extrusion ratio of 9:1, 16:1, and 25:1 are prepared in the same extrusion condition, which are applied to the warm forging test to obtain the different microstructure with respect to the degree of extrusion effect in Mg alloys. The extrusion ratio over 16:1 has little effect on the mechanical properties of the as-extruded bars since the average grain size and amount of precipitates hardly change. The forgeability of the highly extruded bar is improved around flange area while the mechanical properties are slightly enhanced. The rod-type and particle-type precipitates tend to be favored in the as-forged microstructure with the extrusion ratio over 16:1.

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Dynamic recrystallization in AZ31 magnesium alloy

Cited by 320 publications

References 8 publications

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Mechanical Properties and Microstructure of AZ31B Magnesium Alloy Processed by I-ECAP

Effect of Initial Grain Size on Dynamically Recrystallized Grain Size in AZ31 Magnesium Alloy

Effect of the extrusion ratio on the mechanical properties of as-forged Mg-8Al-0.5Zn alloy

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