Analysis of local necking in a biaxially stretched sheet

Wonsiewicz, B. C.; Azrin, Morris; Backofen, W. A.

doi:10.1007/bf02642473

Cited by 59 publications

(80 citation statements)

References 2 publications

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“…Critical resolved shear stresses (CRSS) for pyramidal and prismatic slip are much higher so that their contribution to plastic deformation at room temperature is small. [28][29][30][31] Activation of basal slip is dependent on grain orientation. Experiments [32] and theoretical calculations [33] showed that Schmid factor for basal slip is increased when basal planes are inclined by~45 deg to deformation direction.…”

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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“…Theoretical ORs of f10 1 11g twin and f10 1 13g twin are 56 h11 2 20i and 64 h11 2 20i respectively, and the double twinning of them will lead to the ORs of 38.7 h11 2 20i and 22 h11 2 20i. 3,8,9) The misorientation data in Fig. 2 reveal that most misorientation angles are larger than those due to double twinning (38 and 22 ), but smaller than those of two types of compression twins (56 and 64 ).…”

Section: Determination Of Twin Orientation and Orientationmentioning

confidence: 94%

“…3.3 Dependence of twinning on grain orientation and the condition of double twinning Similar to the case in single crystals, 2,3,[5][6][7] there is a close orientation dependence of deformation twinning on grain orientation in polycrystalline magnesium. Figure 5 Let us analyze the condition for double twinning.…”

Section: Determination Of Twin Orientation and Orientationmentioning

confidence: 99%

“…However, fracture originates mainly from compression twins or shear bands developed from compression twins. [1][2][3] As both basal slip and tension twinning lead to basal texture which possesses a high Schmid factor for compression twinning during compressing or rolling, the formation of compression twins is inevitable. In addition, the (dynamic) recrystallization nucleation 4) at compression twins or shear bands was observed to be more effective than that at tension twins or grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

“…2,3,[5][6][7] Double twinning of the f10 1 11g type followed by the f10 1 12g type was found to be a particular feature of compression twins. The f10 1 11g twin is believed to be dominant among different types of compression twins, although Yoshinaga et al reported that f10 1 15g twins were main twins at room temperature.…”

Section: Introductionmentioning

confidence: 99%

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Analyses on Compression Twins in Magnesium

et al. 2008

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The orientation relationships between the compression twins and their matrices in magnesium were investigated using EBSD technique. Schmid factor analyses were applied to determine the orientation dependency of compression twins and the condition for double twinning. Results show that thin compression twin bands of f10 1 11g type lose easily their exact twin relation of 56 h11 2 20i to $40 h11 2 20i due to the instability of twin orientation and immobility of twin boundaries. And the basal orientation with TD-rotation tends to induce tension twinning in compression twins.

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Formänderungsanalyse mittels des Liniennetzverfahrens

Hašek¹

1990

Umformtechnik

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Analysis of local necking in a biaxially stretched sheet

Cited by 59 publications

References 2 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

Analyses on Compression Twins in Magnesium

Formänderungsanalyse mittels des Liniennetzverfahrens

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