Deformation processes in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:mo stretchy="false">[</mml:mo><mml:mn>1</mml:mn><mml:mspace width="0.12em" /><mml:mn>1</mml:mn><mml:mspace width="0.12em" /><mml:mover accent="true"><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mspace width="0.12em" /><mml:mn>0</mml:mn><mml:mo stretchy="false">]</mml:mo></mml:mrow></mml:math>-textured nanocrystalline Mg by mole

Kim, Dae‐Hyeong; Manuel, Michele V.; Ebrahimi, Fereshteh; Tulenko, J.S.; Phillpot, Simon R.

doi:10.1016/j.actamat.2010.07.036

Cited by 66 publications

(23 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Li and Ma observed deformation twinning mediated by the nucleation and glide of zonal dislocations followed by atomic shuffling in hcp Mg in their MD simulation [164]. They also found that the most favorable zonal dislocation under compression has a Burgers vector of 2 0 texture (2D columnar structure) [277]. However, no zonal dislocation is involved in the formation of the f1 0 1 2gh1 0 1 1i twin in their simulation results.…”

Section: Deformation Twinning In Nanocrystalline Hcp Metalsmentioning

confidence: 93%

“…Furthermore, the mechanisms for the formation of deformation twins are not very well studied even for coarse-grained bcc and hcp metals and alloys. Although the twinning mechanisms for coarse-grained and nc hcp metals are already under investigation [159][160][161]163,166,170,241,273,277,[328][329][330][331][332][333], it is not clear if the twinning phenomena and mechanisms observed in nc fcc metals also occur in nc bcc and fcc systems. For example, it is unknown if the grain size effect on deformation twinning observed in nc fcc metals also exists in nc bcc and hcp metals.…”

Section: Outstanding Issuesmentioning

confidence: 99%

See 1 more Smart Citation

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,141

447

View full text Add to dashboard Cite

Section: Deformation Twinning In Nanocrystalline Hcp Metalsmentioning

confidence: 93%

Section: Outstanding Issuesmentioning

confidence: 99%

Deformation twinning in nanocrystalline materials

Zhu

Liao

2012

Progress in Materials Science

1,141

447

View full text Add to dashboard Cite

“…We employed the embedded atom method (EAM) developed for magnesium by Liu et al [21] to describe the atomic interactions. This potential has been proved useful in investigating the dislocation nucleation and twinning behavior by many studies [22,23,24]. The molecular dynamics program LAMMPS [25] was employed in simulations.…”

Section: Simulation Models and Methodsmentioning

confidence: 99%

Dislocation-Governed Plastic Deformation and Fracture Toughness of Nanotwinned Magnesium

Zhou

Guo

2015

Materials

View full text Add to dashboard Cite

In this work, the plastic deformation mechanisms responsible for mechanical properties and fracture toughness in {10true1¯2}<10true1¯true1¯>nanotwinned (NT). magnesium is studied by molecular dynamics (MD) simulation. The influence of twin boundary (TBs) spacing and crack position on deformation behaviors are investigated. The microstructure evolution at the crack tip are not exactly the same for the left edge crack (LEC) and the right edge crack (REC) models according to calculations of the energy release rate for dislocation nucleation at the crack tip. The LEC growth initiates in a ductile pattern and then turns into a brittle cleavage. In the REC model, the atomic decohesion occurs at the crack tip to create a new free surface which directly induces a brittle cleavage. A ductile to brittle transition is observed which mainly depends on the competition between dislocation motion and crack growth. This competition mechanism is found to be correlated with the TB spacing. The critical values are 10 nm and 13.5 nm for this transition in LEC and REC models, respectively. Essentially, the dislocation densities affected by the TB spacing play a crucial role in the ductile to brittle transition.

show abstract

“…Molecular Dynamics (MD) simulations have proven to be powerful tools for studying the grain size effect on the strength and the atomistic deformation mechanisms of NC fcc 33, 34 , bcc 35 and hcp 36–38 metals, with carefully designed modeling cells in which the real-time responses of the microstructures can be examined. Experiments and MD simulations have also shown a transition in deformation mechanisms at the critical twin boundary spacing (TBS), i.e., from the classical Hall-Petch type strengthening due to the interaction between the dislocation and the twin boundary (TB) to a dislocation-nucleation-controlled softening mechanism with detwinning for fcc metals 14, 39 .…”

Section: Introductionmentioning

confidence: 99%

“…Thus, -textured simulation cells with hexagonal columnar grains (Similar to the configuration used by Kim et al . 36 ) were considered in the present study, as shown in Fig. S1.…”

Section: Introductionmentioning

confidence: 99%

Size effects of lamellar twins on the strength and deformation mechanisms of nanocrystalline hcp cobalt

Wang

Yuan

Jiang

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Twins play an important role in the deformation of nanocrystalline (NC) metals. The size effects of {} tensile/{} compressive lamellar twins on the tensile strength and deformation mechanisms of NC hcp cobalt have been investigated by a series of large-scale molecular dynamics simulations. Unlike the size effects of twins on the strength for polycrystalline fcc metals, the strength of NC hcp cobalt with lamellar tensile/compressive twins monotonically increases with decreasing twin boundary spacing (TBS) and no softening stage is observed, which is due to the consistent deformation mechanisms no matter TBS is large or small. These consistent deformation mechanisms can be categorized into four types of strengthening mechanisms: (i) Partial basal dislocations nucleated from grain boundaries (GBs) or twin boundaries (TBs) intersecting with TBs/GBs; (ii) Phase transformation from hcp to fcc; (iii) partial edge dislocations nucleated from TBs intersecting with basal partial dislocations; (iv) Growth of the newly formed secondary tensile twins inside the primary compressive/tensile twins. The observed multiple twinning in MD simulations has also been confirmed by TEM after tensile testing in NC cobalt processed by severe plastic deformation.

show abstract

Deformation processes in [112¯0]-textured nanocrystalline Mg by mole

Cited by 66 publications

References 72 publications

Deformation twinning in nanocrystalline materials

Deformation twinning in nanocrystalline materials

Dislocation-Governed Plastic Deformation and Fracture Toughness of Nanotwinned Magnesium

Size effects of lamellar twins on the strength and deformation mechanisms of nanocrystalline hcp cobalt

Contact Info

Product

Resources

About