Significance of twinning in the anisotropic behavior of a magnesium alloy processed by equal-channel angular pressing

Figueiredo, Roberto B.; Száraz, Zoltán; Trojanová, Zuzanka; Lukáč, P.; Langdon, Terence G.

doi:10.1016/j.scriptamat.2010.05.016

Cited by 56 publications

(30 citation statements)

References 17 publications

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“…This phenomenon was also studied by conducting a set of compression tests along three different directions of an ECAPed billet. [37] Increased tendency for twinning was observed when sample was tested along throughthickness direction, compared with testing along ED. Textural measurement performed for the sample C shows that basal planes are inclined at~35 deg, which favors basal slip along ED.…”

Section: A Effects Of Grain Size and Texture On Mechanical Propertiesmentioning

confidence: 99%

“…It was concluded that twinning in compression can be avoided in fine-grained AZ31 by temperature increase up to 423 K (150°C). However, recent reports [37,38] show that ECAP processing can lead to twinning suppression during compression along ED at room temperature. Therefore, a textural effect should also be taken into account when investigating twinning behavior of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

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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: A Effects Of Grain Size and Texture On Mechanical Propertiesmentioning

confidence: 99%

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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“…Figure 6 shows stress vs. strain curves determined along orthogonal directions of the AZ31 alloy in (a) the extruded condition and after ECAP processing by (b,c) 2 and (d,e) 4 passes. The processing route was (b,d,e) B C and (c) C and the ECAP die angle was (b,c,d) 90º and (e) 135º [44]. The testing was carried out parallel to the pressing direction (X-direction), from top to bottom (Z-direction) and along the through thickness direction which is perpendicular to the ECAP channels (Y-direction).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Processing magnesium alloys by severe plastic deformation

Figueiredo

Aguilar

Cetlin

et al. 2014

IOP Conf. Ser.: Mater. Sci. Eng.

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“…It was also shown that fine grain microstructure (3-4 µm) can switch deformation mechanism from twinning-to slip-dominated. This effect was observed only at elevated temperatures, whereas ECAP processing is believed to suppress twinning during compression along extrusion direction even at room temperature [20].…”

Section: Introductionmentioning

confidence: 94%

Route Effects in I-ECAP of AZ31B Magnesium Alloy

Gzyl¹,

Rosochowski²,

Yakushina³

et al. 2013

KEM

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Abstract. An AZ31B wrought magnesium alloy was processed by incremental equal channel angular pressing (I-ECAP) using routes A and B C . Despite the fact that the measured grain size for both routes was very similar, the mechanical properties were different. Tensile strength was improved using route A comparing to route B C , without ductility loss, while tension-compression anisotropy observed for route A was significantly suppressed when using route B C . Moreover, billet shape evolution resulting from subsequent passes of I-ECAP was studied. Significant distortion after processing using route B C and no occurrence of such effect for route A were observed. Results of a finite element analysis showed that nonuniform strain rate sensitivity might be responsible for different billet shapes. The conclusion is drawn that processing route has a strong influence on the billet shape and mechanical properties when processing magnesium alloys by I-ECAP.

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Significance of twinning in the anisotropic behavior of a magnesium alloy processed by equal-channel angular pressing

Cited by 56 publications

References 17 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

Processing magnesium alloys by severe plastic deformation

Route Effects in I-ECAP of AZ31B Magnesium Alloy

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