Microstructure, crystallographic texture and mechanical properties of the magnesium alloy AZ31B after different routes of thermo-mechanical processing

Seipp, S.; Wagner, Martin F.‐X.; Hockauf, Kristin; Schneider, Ines; Meyer, Lothar; Hockauf, Matthias

doi:10.1016/j.ijplas.2012.03.007

Cited by 89 publications

(37 citation statements)

References 25 publications

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“…[10] Grain refinement led to formability enhancement accompanied by a yield stress decrease, which is usually observed for AZ31 magnesium alloy subjected to ECAP. [17,22] However, results obtained for the sample A indicate that grain size cannot be the only explanation for change of mechanical properties after I-ECAP.…”

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

confidence: 83%

“…[17] The decrease of the yield strength with subsequent passes of ECAP was also shown in other articles. [10,22] On the other hand, increase of yield stress after four passes was reported in Reference 18. Significant improvement in the strength of AZ31 magnesium alloy (0.2 pct proof strength equal to 372 MPa) was reported only for grain sizes smaller than 1 lm.…”

Section: Introductionmentioning

confidence: 90%

“…The mean grain sizes reported for different conditions were 1 lm at 423 K (150°C), [7] 2 lm [8,9] at 473 K (200°C), and 6 lm at 523 K (250°C). [10,11] In order to enable further grain refinement, the processing temperature must be decreased along with a simultaneous decrease of strain rate. Different experimental plans were proposed to conduct ECAP at temperatures lower than 473 K (200°C) without crack occurrence.…”

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: 83%

Section: Introductionmentioning

confidence: 90%

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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“…For example during deep drawing operations, following the material point that flows from the flange area to the die cavity, the strain mode changes from pure shear to biaxial tension (Esche et al, 2000). Another example is the ECAP process in which the orientation of the specimen changes between consecutive passes (Seipp et al, 2012;Sivaraman and Chakkingal, 2008;Yapici et al, 2007). Gradual or sudden deviation from proportional strain paths during deformation is for some materials, especially those with high stacking-fault energy, associated with extra hardening or softening and a transient stress and hardening-rate response can be observed.…”

Section: Microstructure and Mechanical Behavior After Strain-path Chamentioning

confidence: 99%

Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

Maník

Holmedal

Hopperstad

2015

International Journal of Plasticity

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Commercially pure aluminum with random texture was prestrained either by rolling or by uniaxial compression, and then tested in uniaxial tension to study the transients in flow stress, work hardening and r-value induced by the strain-path change. New experimental results are reported on the variation of the r-value and the permanently reduced work hardening subsequent to the strain-path change. A continuum plasticity model was developed that can reproduce the observed behavior. The model applies a second-order "delayed pointer" tensor to represent the microstructural anisotropy and was implemented into the finite element software LS-DYNA. The model was calibrated to the experimental data, and a simulation of early strain localization subsequent to an orthogonal strain-path change was compared to strain fields measured by a digital image correlation technique.2

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“…Yield strength decrease and ductility enhancement are usually observed after 4 passes [15,16,17]. The inverse Hall-Petch effect was also reported for AZ61 magnesium alloys in [18].…”

Section: Introductionmentioning

confidence: 69%

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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Microstructure, crystallographic texture and mechanical properties of the magnesium alloy AZ31B after different routes of thermo-mechanical processing

Cited by 89 publications

References 25 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

Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

Route Effects in I-ECAP of AZ31B Magnesium Alloy

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