Twin boundary reversibility characteristics in α-Fe

Veerababu, J.; Sainath, G.; Nagesha, A.

doi:10.1016/j.mtcomm.2021.102970

Cited by 4 publications

(4 citation statements)

References 38 publications

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“…Shear-coupled migration, GB migration with rotation, GB sliding, GB decomposition, and GB deformation with dislocation emission were observed in the present study. The bicrystal deformation mechanisms under shear load are summarized in figure 10 from the open literature [9,14,26,[44][45][46][47][48]. The results obtained from the present investigation were in line with these mechanisms.…”

Section: Discussionsupporting

confidence: 86%

“…Reduction in GB strength due to the atomic shuffling under shear was evident earlier in Cu [52]. Once the new TB was created, it migrated under further shear stress (figure 6(d)) as per the mechanism explained earlier by Veerababu et al [9]. It is worthwhile to mention that the Σ3 1 12…”

Section: Discussionmentioning

confidence: 61%

“…During the migration of the TB, the UG slid along the shear direction, which was manifested as a change in the slope of the side surfaces above and below the TB. This type of GB migration is called shear-coupled migration [9].…”

Section: Resultsmentioning

confidence: 99%

“…Twins can form during either the annealing process or plastic deformation. In both cases, twin boundaries (TB) can migrate under shear stress [9]. Strain-induced boundary migration is an underlying mechanism for generating CSL GBs [10] in those processes.…”

Section: Introductionmentioning

confidence: 99%

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Shear response of 〈110〉 asymmetric tilt grain boundaries in BCC-Fe

Veerababu,

Nagesha,

Shankar

2024

Phys. Scr.

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The present study investigated the effect of shear load on the <110> asymmetric tilt grain boundaries of body-centered cubic iron with molecular dynamics simulations. Various mechanisms like grain boundary (GB) sliding, shear-coupled migration, GB migration with rotation, GB decomposition, and GB deformation with dislocations emission were observed. Low-angle tilt GBs migrated with the help of two dislocation mechanisms, gliding and climbing. Two types of twin nucleation mechanisms were noticed in high-angle tilt GBs with varying tilt angles (η). For 16 ̊ ≤ η ≤ 112 ̊ and η ≥ 130 ̊ cases, dynamic self-adjustment of the atoms at the GBs caused GBs decomposition with the formation of twin boundaries (TBs). Newly nucleated TBs migrated under further applied shear load. For 112 ̊ < η < 130 ̊ case, TBs nucleated from the GB on either side of the misfit dislocations due to their localized core structure on the GB plane.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shear response of 〈110〉 asymmetric tilt grain boundaries in BCC-Fe

Veerababu,

Nagesha,

Shankar

2024

Phys. Scr.

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Twin Nucleation Mechanism from a Screw Dislocation in BCC-Fe

Veerababu,

Sainath,

Nagesha

2024

Trans Indian Inst Met

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Twinning is a predominant deformation mechanism in nanocrystalline materials. The present study uses molecular dynamics simulations to address the feasibility of forming a twin in BCC-Fe via the three-fold dissociation of a screw dislocation, as proposed by Sleeswyk. Gliding of the screw dislocation at lower shear strain rates and formation of the twin at higher shear strain rate via two-fold dissociation was observed. The gliding of the screw dislocation occurred through the kink-pair-assisted mechanism. Three-fold dissociation on three co-zonal {110} planes with the trailing stacking faults was noticed only at temperatures below or equal to 50 K. However, this dissociation failed to support Sleeswyk’s reaction explicitly. Sleeswyk’s reaction may occur through a spontaneous collapsing of the three-fold dissociation at the time of dissociation and proceeds with twinning. Interatomic potentials, which can predict the three-fold dissociation, were presented.

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Competition between full slip and twinning in BCC-Fe: Effect of preloaded stress and temperature

Veerababu

Nagesha

2023

Journal of Applied Physics

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Slip or twinning is one of the fundamental questions in the deformation studies of metals and alloys. Internal parameters such as generalized stacking fault energy and size and external parameters such as pressure, strain rate, and temperature influence the competition between the full slip and twinning, thus dictating the predominance of one mechanism over the other. In the present investigation, we studied the influence of preloaded stress and temperature on the deformation behavior of BCC-Fe nanowires using molecular dynamics simulations and theoretical analysis. Based on detailed investigations into the energetics associated with slip and twinning, we observed that twinning is the preferred deformation mechanism in BCC-Fe. However, this has been modified by preloaded stresses applied in normal, transverse, and both directions on the nanowire. We observed a slip on {110}, on {112}, and even on {123} planes. The temperature did not alter the inherent twinning nature but linearly decreased the various fault energies.

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Twin boundary reversibility characteristics in α-Fe

Cited by 4 publications

References 38 publications

Shear response of 〈110〉 asymmetric tilt grain boundaries in BCC-Fe

Shear response of 〈110〉 asymmetric tilt grain boundaries in BCC-Fe

Twin Nucleation Mechanism from a Screw Dislocation in BCC-Fe

Competition between full slip and twinning in BCC-Fe: Effect of preloaded stress and temperature

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