The accommodation around {101̄2} 〈1̄011〉 twins in magnesium

Roberts, E.; Partridge, P. G.

doi:10.1016/0001-6160(66)90319-1

Cited by 65 publications

(35 citation statements)

References 9 publications

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“…Based on the results of Hasuer and others [2,8,11,31,61,62] and on the results of our work, we believe kinking plays a key but hitherto unappreciated role, without which full understanding of the deformation of Mg remains elusive.…”

Section: B Correlation Between Kinking Bending and Twinningsupporting

confidence: 54%

“…[2,8,11,31,61,62] For example, by carrying out a detailed analysis of the deformation of Mg single crystals, Burke and Hibbard [2] concluded that: ''These experimental observations seem to establish that twinning in Mg is directly related to a bending phenomenon.'' They also state: ''The series of micrographs disclosing that twinning ceases at the bend plane demonstrates that bending is a vital and necessary part of twinning.''…”

Section: B Correlation Between Kinking Bending and Twinningmentioning

confidence: 99%

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Kinking Nonlinear Elasticity and the Deformation of Magnesium

Zhou

Barsoum

2009

Metall Mater Trans A

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Despite a large body of work devoted to understanding the deformation of polycrystalline magnesium, there are still some outstanding questions, not the least of which are the nature of its microyielding and the nature of its fully reversible, hysteretic, stress-strain curves. In this article, we provide further evidence that Mg is a kinking nonlinear solid by showing excellent agreement between the predictions of our microscale model, in which fully reversible, dislocation-based incipient kink bands (IKBs) are the key microscale element, the experimental results obtained in our study, and, just as important, the results obtained by others. It follows that microyielding and the fully reversible hysteresis loops are most likely to be due to IKB formation, with the propensity for kinking being enhanced for coarse-grained samples up to a grain size of %50 lm, after which further increases in grain size have little effect. From the areas of the reversible loops, the critical resolved shear stresses (CRSSs) associated with the movement of basal plane dislocations are obtained and are shown to scale with the maximum flow stresses at which the loops are obtained. We also make the case that, at least for low strains, strains along the c-axis can be accommodated by invoking the formation of IKBs, mobile dislocation walls, and kink boundaries and should be included in future modeling of the deformation of polycrystalline Mg.

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Section: B Correlation Between Kinking Bending and Twinningsupporting

confidence: 54%

Section: B Correlation Between Kinking Bending and Twinningmentioning

confidence: 99%

Kinking Nonlinear Elasticity and the Deformation of Magnesium

Zhou

Barsoum

2009

Metall Mater Trans A

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“…The quilted structure forms through the blocking and propagation of the above-mentioned active twinning systems. These features have been widely observed within orthotropic materials [21][22][23][24][25][26][27][28][29]. Twin broadening was observed from the top surface to a depth of * 400 lm.…”

Section: Resultsmentioning

confidence: 53%

Response of Ti microstructure in mechanical and laser forming processes

et al. 2018

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Microstructural deformation mechanisms present during three different forming processes in commercially pure Ti were analysed. Room temperature mechanical forming, laser beam forming and a combination of these two processes were applied to thick metal plates in order to achieve the same final shape. An electron backscatter diffraction technique was used to study the plate microstructure before and after applying the forming processes. Substantial differences among the main deformation mechanisms were clearly detected. In pure mechanical forming at room temperature, mechanical twinning predominates in both compression and tensile areas. A dislocation slip mechanism inside the compression and tensile area is characteristic of the pure laser forming process. Forming processes which subsequently combine the laser and mechanical approaches result in a combination of twinning and dislocation mechanisms. The Schmid factor at an individual grain level, the local temperature and the strain rate are factors that determine which deformation mechanism will prevail at the microscopic level. The final microstructures obtained after the different forming processes were applied are discussed from the point of view of their influence on the performance of the resulting formed product. The observations suggest that phase transformation in Ti is an additional microstructural factor that has to be considered during laser forming.

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“…However, the coexistence of slip and twinning in Mg leads to a complex deformation behavior with rich microstructural phenomena that are responsible for the macroscopic response, cf. (Hauser et al, 1956;ReedHill and Robertson, 1958;Roberts and Partridge, 1966;Wonsiewicz and Backofen, 1967;Ando and Tonda, 2000). The exact deformation modes are still subject to controversial discussions which have raised a number of open questions, see e.g.…”

Section: Introductionmentioning

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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The accommodation around {101̄2} 〈1̄011〉 twins in magnesium

Cited by 65 publications

References 9 publications

Kinking Nonlinear Elasticity and the Deformation of Magnesium

Kinking Nonlinear Elasticity and the Deformation of Magnesium

Response of Ti microstructure in mechanical and laser forming processes

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

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