Role of {10–12} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy

Hong, Seong-Gu; Park, Sung Hyuk; Lee, Chong Soo

doi:10.1016/j.actamat.2010.07.002

Cited by 751 publications

(211 citation statements)

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“…A few grains also contain variants with the fifth and/or sixth ranked SF (4 out of 132 grains in the 10% strained sample). This is in contrast to the observation of Hong et al [9], where they reported that during compression perpendicular to the c-axis mostly only one twin variant or twin variant pair was active in each grain.…”

Section: Variant Selection Mechanismscontrasting

confidence: 56%

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Extension twin variant selection during uniaxial compression of a magnesium alloy

Pei

Godfrey

Jiang

et al. 2012

Materials Science and Engineering: A

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Samples of the magnesium alloy AZ31 have been deformed by compression to strains of 5% and 10% and microstructural observations made to investigate the activation of specific {10-12} extension twin variants. The twinning has been analyzed on a grain-by-grain basis for more than 260 grains to determine both the number of extension twin variants in each grain, and the volume fraction of each. At 5% strain approx. 30% of the grains contain twins corresponding to variants with the third or lower ranked Schmid factor, with the fraction increasing to 40% after 10% compression. A grain size effect is also observed in that smaller grains are less likely to contain lower ranked twin variants. For both 5% and 10% compression no clear relationship exists between the volume fraction of each twin variant in a given grain population and the Schmid factor for the twin variant. A positive linear relationship can be defined, however, between the maximum twinning fraction that a twin variant can reach and its Schmid factor. TITLE PAGE Abstract:Samples of the magnesium alloy AZ31 have been deformed by compression to strains of 5% and 10% and microstructural observations made to investigate the activation of specific {1012} extension twin variants. The twinning has been analyzed on a grain-by-grain basis for more than 260 grains to determine both the number of extension twin variants in each grain, and the volume fraction of each. At 5% strain approx. 30% of the grains contain twins corresponding to variants with the third or lower ranked Schmid factor, with the fraction increasing to 40% after 10% compression. A grain size effect is also observed in that smaller grains are less likely to contain lower ranked twin variants. For both 5% and 10% compression no clear relationship exists between the volume fraction of each twin variant in a given grain population and the Schmid factor for the twin variant. A positive linear relationship can be defined, however, between the maximum twinning fraction that a twin variant can reach and its Schmid factor.

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Section: Variant Selection Mechanismscontrasting

confidence: 56%

“…The grain orientation dependence of twinning within individual grains has been discussed by several authors in terms of a Schmid factor (SF) [1,[9][10][11][12][13][14][15][16] analogous to that used in the analysis of dislocation glide. Although in many cases primary twinning has been found to…”

Section: Introductionmentioning

confidence: 99%

Extension twin variant selection during uniaxial compression of a magnesium alloy

Pei

Godfrey

Jiang

et al. 2012

Materials Science and Engineering: A

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“…the activity of a second twin system in already-twinned domains of the crystal, see e.g. Hong et al (2010); Kadiri et al (2013). However, how such competing twin systems develop (e.g.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

A variational constitutive model for slip-twinning interactions in hcp metals: Application to single- and polycrystalline magnesium

Chang

Kochmann

2015

International Journal of Plasticity

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractWe present a constitutive model for hcp metals which is based on variational constitutive updates of plastic slips and twin volume fractions and accounts for the related lattice reorientation mechanisms. The model is applied to singleand polycrystalline pure magnesium. We outline the finite-deformation plasticity model combining basal, pyramidal, and prismatic dislocation activity as well as a convexification-based approach for deformation twinning. A comparison with experimental data from single-crystal tension-compression experiments validates the model and serves for parameter identification. The extension to polycrystals via both Taylor-type modeling and finite element simulations shows a characteristic stress-strain response that agrees well with experimental observations for polycrystalline magnesium. The presented continuum model does not aim to represent the full details of individual twin-dislocation interactions; yet, it is sufficiently efficient to allow for finite element simulations while qualitatively capturing the underlying microstructural deformation mechanisms.

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“…While none of these slip modes can accommodate deformation along the c-axis, deformation twinning can provide limited deformation along the c-axis. {10.2}<10.1> extension twinning is commonly found during plastic deformation at room temperature in favorably oriented grains relative to the applied loading direction, leading to tension-compression yield asymmetry and strong plastic anisotropy in magnesium alloys [5][6][7][8]. When deformation twinning occurs, the lattice is reoriented approximately 86.3° relative to the parent lattice, resulting in pronounced changes in the crystallographic texture during deformation [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Twinning-Detwinning Behavior during Cyclic Deformation of Magnesium Alloy

Lee

Wang

Gharghouri

2015

Metals

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Abstract:In situ neutron diffraction has been used to examine the deformation mechanisms of a precipitation-hardened and extruded .%Al alloy subjected to (i) compression followed by reverse tension (texture T1) and (ii) tension followed by reverse compression (texture T2). Two starting textures are used: (1) as-extruded texture, T1, in which the basal pole of most grains is normal to the extrusion axis and a small portion of grains are oriented with the basal pole parallel to the extrusion axis; (2) a reoriented texture, T2, in which the basal pole of most grains is parallel to the extrusion axis. For texture T1, the onset of extension twinning corresponds well with the macroscopic elastic-plastic transition during the initial compression stage. The non-linear macroscopic stress/strain behavior during unloading after compression is more significant than during unloading after tension. For texture T2, little detwinning occurs after the initial tension stage, but almost all of the twinned volumes are detwinned during loading in reverse compression.

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Role of {10–12} twinning characteristics in the deformation behavior of a polycrystalline magnesium alloy

Cited by 751 publications

References 23 publications

Extension twin variant selection during uniaxial compression of a magnesium alloy

Extension twin variant selection during uniaxial compression of a magnesium alloy

A variational constitutive model for slip-twinning interactions in hcp metals: Application to single- and polycrystalline magnesium

Twinning-Detwinning Behavior during Cyclic Deformation of Magnesium Alloy

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