Room-temperature equal channel angular extrusion of pure magnesium

Biswas, Samir Kumar; Dhinwal, Satyaveer Singh; Suwas, Satyam

doi:10.1016/j.actamat.2010.01.051

Cited by 251 publications

(107 citation statements)

References 46 publications

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“…This temperature is similar to the reported in a recent publication 10 . Earlier papers 8,9 reported a minimum temperature of 623 K to successfully process pure magnesium without cracks.…”

Section: Discussionsupporting

confidence: 81%

“…These observations were made after a complete pass of ECAP and grain growth might have taken place as the billet is held at high temperature at the exit channel. On the other hand, some papers 10,11 report heterogeneous grain size distribution on pure magnesium when processed at lower temperatures. A detailed observation of the structure evolution throughout the deformation zone is still missing.…”

Section: Equal Channel Angular Pressing (Ecap)mentioning

confidence: 99%

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Grain refinement of commercial purity Magnesium processed by Ecap (Equal Channel Angular Pressing)

et al. 2012

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Grain refinement in magnesium is evaluated in the present paper. Equal Channel Angular Pressing is used to process commercially pure magnesium. Processing was carried out at 523 K which is lower than the temperature used in other papers on the literature. The grain structure was evaluated throughout the deformation zone. The low processing temperature prevents significant grain growth. The evolution of the grain structure is compared to a recent model for mechanism of grain refinement in magnesium. The present results confirm the validity of the model.

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“…This temperature is similar to the reported in a recent publication 10 . Earlier papers 8,9 reported a minimum temperature of 623 K to successfully process pure magnesium without cracks.…”

Section: Discussionsupporting

confidence: 81%

Section: Equal Channel Angular Pressing (Ecap)mentioning

confidence: 99%

Grain refinement of commercial purity Magnesium processed by Ecap (Equal Channel Angular Pressing)

et al. 2012

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“…They are based on the idea of gradual temperature decrease with subsequent passes. [12][13][14] The smallest reported grain size obtained using this method was equal to 0.37 lm at the final temperature 388 K (115°C). [13] The grain-refinement mechanism during the processing of magnesium alloys by ECAP is significantly different from that for fcc metals.…”

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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“…This leads to a significant activity of twinning and to a widespread belief that Mg is a hard-to-deform material, which limits its applicability as a construction material. The ways to improve the deformation characteristics of Mg include grain refinement [7,8] and alloying with rare-earth elements [9]. Both procedures are expensive and their application potential is thus limited.…”

Section: Introductionmentioning

confidence: 99%

Peierls barriers of a-type edge and screw dislocations moving on basal and prismatic planes in magnesium

Ostapovets

Vatazhuk

2017

Low Temperature Physics

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Exact shape of Peierls barriers are calculated for edge and screw dislocation gliding on basal and prismatic planes in magnesium by using of several popular interatomic potentials. Comparison of these potentials is performed in order to describe their abilities and limitations. Stability of different types of dislocation cores are analyzed as well as their mutual transformations during dislocation slip. It was found that the Peierls stresses and barrier height are dependent on core type. It was concluded that transformations of dislocation cores along minimal energy paths have to be taken into account for development of analytical models of the slip in magnesium. The results are compared with available first-principles calculations.

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Room-temperature equal channel angular extrusion of pure magnesium

Cited by 251 publications

References 46 publications

Grain refinement of commercial purity Magnesium processed by Ecap (Equal Channel Angular Pressing)

Grain refinement of commercial purity Magnesium processed by Ecap (Equal Channel Angular Pressing)

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

Peierls barriers of a-type edge and screw dislocations moving on basal and prismatic planes in magnesium

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