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

Serebryany, V. N.; Добаткин, С. В.

doi:10.4028/www.scientific.net/msf.702-703.119

Cited by 3 publications

(3 citation statements)

References 22 publications

(28 reference statements)

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“…In addition, thermomechanical processing may also provide further favourable properties by texture modification, grain size reduction, and subsequent further grain refinement because of dynamic recrystallisation. [265][266][267][268] Severe plastic deformation (SPD), in particular, is gaining popularity in the study of wrought Mg alloys. 269 The effect of SPD (Severe Plastic Deformation) on corrosion is intrinsically connected to the produced microstructure, which is temperature sensitive -and therefore needs to be considered individually for a particular alloy composition.…”

Section: Prospects and Aspects For Retarding The Corrosion Kinetics O...mentioning

confidence: 99%

Corrosion of magnesium alloys: the role of alloying

Gusieva

Davies

Scully

et al. 2014

International Materials Reviews

411

208

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The demand for light-weighting in transport and consumer electronics has seen rapid growth in the commercial usage of magnesium (Mg). The major use of Mg is now in cast Mg products, as opposed to the use of Mg as an alloying element in other alloy systems and there is an emerging market of wrought Mg products and biomedical Mg components -such that the past two decades have seen a significant number of new Mg-alloys reported. None-the-less, the corrosion of Mg alloys continues to be a challenge facing engineers seeking weight reductions by deployment of Mg. Herein, authors review the influence of alloying on the corrosion of Mg-alloys, with particular emphasis on the underlying electrochemical kinetics that dictate the ultimate corrosion rate. Such a review focusing on the chemistry-corrosion link, both in depth and in a holistic approach, is lacking. As such the authors do not describe aspects such as high-temperature oxidation or cracking, but focus on delivering the state-of-the-art with regards to alloying influences on corrosion kinetics. It has been demonstrated that Mg itself will not be thermodynamically passive in environments of pH,11, regardless of the extent and type of alloying and hence corrosion kinetics require unique attention. Authors consolidate the presentation to include essentially all commercially available alloys and in excess of 350 custom alloys with wide variations in composition; in addition to reviewing the range of intermetallic compounds and impurities that form in such alloys systems. An update is also given regarding mechanistic advances and the role of grain size on corrosion of Mg. A wider understanding of the role of chemical effects upon corrosion of Mg is both timely and serves to highlight metallurgical approaches towards kinetically retarding the corrosion problem. The latter is of key relevance to next generation lightweight alloys and rational design of wrought Mg and bio-Mg.

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Section: Prospects and Aspects For Retarding The Corrosion Kinetics O...mentioning

confidence: 99%

Corrosion of magnesium alloys: the role of alloying

Gusieva

Davies

Scully

et al. 2014

International Materials Reviews

411

208

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

Cited by 3 publications

References 22 publications

Corrosion of magnesium alloys: the role of alloying

Corrosion of magnesium alloys: the role of alloying

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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