Statistical analyses of deformation twinning in magnesium

Beyerlein, Irene J.; Capolungo, Laurent; Marshall, P.; McCabe, Rodney J.; Tomé, Carlos N.

doi:10.1080/14786431003630835

Cited by 462 publications

(261 citation statements)

References 31 publications

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“…Twinning leads to a hard orientation of the crystalline structure and significant hardening is observed in the stressstrain curves [1]. Also, experiments show that the fraction of grains with twinning is independent of the grain area although grain areas smaller than ~21 µm 2 , corresponding to grain diameters of <5.25 µm, were not considered [2]. However, a twinning to slip transition was reported in compression testing when reducing the grain size in an AZ31 magnesium alloy [3] and also in pure magnesium [4,5].…”

Section: Introductionmentioning

confidence: 99%

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296 -373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ≈ 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ~360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°  45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ~5 µm.

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Section: Introductionmentioning

confidence: 99%

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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“…Among many applications, EBSD is convenient for statistically analyzing twinning [28,29,38] and characterizing local lattice rotation. [40,41] Laue microdiffraction uses a high-energy polychromatic X-ray microbeam to probe the material.…”

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confidence: 99%

“…At room temperature, T1 twinning is the most commonly observed twinning mode in Ti and other hexagonal metals with c/a ratio less than ffiffiffiffiffiffiffi ffi 8=3 p , such as Mg and Zr. [23][24][25][26][27][28][29] Several atomistic and grain-scale models have been proposed to account for the nucleation and growth of T1 twins. [30][31][32][33][34][35][36] In contrast, other twinning modes have received much less attention.…”

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confidence: 99%

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Wang

Barabash

Bieler

et al. 2013

Metall Mater Trans A

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Activity of the f11 " 21gh " 1 " 126i extension twinning (T2) mode was analyzed in a commercial purity Ti sample after 2 pct tensile strain imposed by four-point bending. The sample had a moderate c-axis fiber texture parallel to the tensile axis. Compared with the many f10 " 12gh " 1011i extension (T1) twins that formed in 6 pct of the grains, T2 twins were identified in 0.25 pct of the grains by scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) maps. Most of the T2 twins exhibited irregular twin boundaries (TBs) on one side of the twin. Highresolution EBSD revealed both intermediate orientations at some matrix/twin interfaces and substantial lattice rotation within some T2 twins. Interactions between matrix hc + ai dislocations 1 3 h1 " 213i and a f11 " 21g T2 twin were investigated by combining SEM/EBSD slip trace characterization and Laue microdiffraction peak streak analysis. hc + ai dislocations that originally glided on a pyramidal plane in the matrix were found on other planes in both the matrix and the twin, which was attributed to extensive cross-slip of the screw component, whose Burgers vector was parallel to the twinning plane. On the other hand, thickening of the twin could engulf some pile-up edge components in front of the TB. During this process, these hc + ai dislocations transmuted from a pyramidal plane ð0 " 111Þ in the matrix to a prismatic plane ð " 1010Þ T in the twin lattice. Finally, possible mechanisms for the nucleation and growth of T2 twins will be discussed.

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“…This consideration assumes the importance of grain boundaries on twin nucleation. The true twin thickness has been found to be independent of grain size in magnesium and zirconium by Tome' and colleagues [7,25] but strongly dependent on the grain size in titanium [26]. Nevertheless, they found that the number of twins, in grains that did twin, increased with increasing grain size.…”

Section: Discussionmentioning

confidence: 80%

Proceedings of the 13th World Conference on Titanium

2016

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Twin formation in alpha-Ti is a topic of much debate as the role of microstructure features and alloy chemistry on twin formation remains unclear. In the present work, early stage of twin formation, i.e. after 1% plastic compression, has been studied in 3D using diffraction contrast tomography. This technique has enabled to study a volume about 400 grains enabling statistical analysis. The family of twinned grains was compared with similarly orientated grains that had not twinned in respect of their neighbourhood and grain size. While the initial neighbourhood analysis did not identify any significant differences, 3D grain size analysis highlighted that grain size plays an important role during the early stage of twinning. Further, twin clusters/chains were identified, which form slightly imperfect 3D networks. A more detailed neighbourhood analysis of the parent grains associated with the twin clusters/chains demonstrate that strain localization in neighbouring grains well aligned for prismatic slip transfer promote the observed twin clustering.

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Statistical analyses of deformation twinning in magnesium

Cited by 462 publications

References 31 publications

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Study of $$ \{ 11\bar{2} 1\} $$ Twinning in α-Ti by EBSD and Laue Microdiffraction

Proceedings of the 13th World Conference on Titanium

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