Twin–twin interactions in magnesium

Yu, Qin; Wang, Jian; Jiang, Yanyao; McCabe, Rodney J.; Li, Nan; Tomé, Carlos N.

doi:10.1016/j.actamat.2014.05.030

Cited by 265 publications

(88 citation statements)

References 59 publications

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“…The majority of the twinning deformation system is the 64.30°compression, while a minority of 76.70°compression together with 84.70°tension twins is also present. These microstructural features can be described as quilted looking structures due to the apparent crossing twinning systems after deformation [20]. The quilted structure forms through the blocking and propagation of the above-mentioned active twinning systems.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

Response of Ti microstructure in mechanical and laser forming processes

et al. 2018

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“…In contrast, deformation twins often contain only one type of TD and have associated elastic strain fields. They also tend to have highly asymmetric lenticular shapes [29]. Hence, observable boundaries always have some defects present aside from the perfect terrace planes.…”

Section: Introductionmentioning

confidence: 99%

Interface structures and twinning mechanisms of twins in hexagonal metals

Gong

Hirth

Liu

et al. 2017

Materials Research Letters

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A controversy concerning the description of {1012} 1011 twinning, whether it is shear-shuffle or pure glide-shuffle or pure shuffle, has developed. There is disagreement about the interpretation of transmission electron microscopic observations, atomistic simulations and theories for twin growth. In this article, we highlight the atomic-level, characteristic, equilibrium and non-equilibrium boundaries and corresponding boundary defects associated with the threedimensional 'normal', 'forward' and 'lateral' propagation of {1012} growth/annealing and deformation twins. Although deformation twin boundaries (TBs) after recovery exhibit some similarity to growth/annealing TBs because of the plastic accommodation of stress fields, there are important distinctions among them. These distinctions distinguish among the mechanisms of twin growth and resolve the controversy. In addition, a new type of disconnection, a glide disclination, is described for twinning. Synchroshear, seldom considered, is shown to be a likely mechanism for {1012} twinning. IMPACT STATEMENTA controversy concerning {1012} 1011 twinning in hcp metals has developed. We present comprehensive understanding of interface structures and twinning mechanisms of {1012} growth/annealing and deformation twins at the atomic level. ARTICLE HISTORY

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“…Fig. 5 also reveals that junctions between T 1 À T 1 twins with parallel zone axes, studied by Yu et al [26,27] in Mg single crystals, do not correspond to the predominant type of twin-twin junctions here. Results are purely qualitative but they can be used as guidelines for molecular dynamic simulations by highlighting what type of twin-twin junctions should be considered for a given microstructure and loading path.…”

Section: Twin-twin Junctions Statisticsmentioning

confidence: 70%

“…Twin-twin intersections behaved as barriers counteracting further twin propagation and lead to higher strain hardening. Yu et al [26,27] experimentally characterized three different {1 0 1 2} twin-twin junctions in Mg single crystals that had been cyclically loaded. These prior studies are all limited to {1 0 1 2} tensile twins.…”

Section: Introductionmentioning

confidence: 99%