Interface dislocation patterns and dislocation nucleation in face-centered-cubic and body-centered-cubic bicrystal interfaces

Wang, Jian; Zhang, Ruifang; Zhou, Caizhi; Beyerlein, Irene J.; Misra, Amit

doi:10.1016/j.ijplas.2013.07.002

Cited by 124 publications

(53 citation statements)

References 53 publications

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“…We focus on the PP interface because of its lower interface energy. Supporting this view, the pattern of Figure 10 A reference CDP for the PP case is constructed in Figure 10(a), where the coherency strain is partitioned between the crystals, as indicated in the rotated CDP [17,86,87] defined in Figure 10(b). The PP interface has a relative rotation of unit cells of 90°.…”

Section: Relaxed Lateral Tbsmentioning

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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Section: Relaxed Lateral Tbsmentioning

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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“…Much effort has been paid recently to the nucleation of lattice dislocations at interfaces and/or grain boundaries [20][21][22][23][24][25][26][27][28]. Dislocation nucleation from a coherent interface is difficult since it would need to overcome a high-energy barrier associated with reducing interface coherence [27,30].…”

Section: Introductionmentioning

confidence: 99%

“…Dislocation nucleation from a coherent interface is difficult since it would need to overcome a high-energy barrier associated with reducing interface coherence [27,30]. In contrast, interfacial dislocations in a semi-coherent interface, including misfit dislocations and interface disconnections, can act as sources for nucleation of lattice dislocations [25][26][27][28][29][30]. Using molecular dynamics (MD) simulations, the nucleation of lattice dislocations has been demonstrated to be related to both the characteristics of interfacial dislocations and interface properties [29,30].…”

Section: Introductionmentioning

confidence: 99%

Glide dislocation nucleation from dislocation nodes at semi-coherent {1 1 1} Cu–Ni interfaces

et al. 2015

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a b s t r a c tUsing atomistic simulations and dislocation theory on a model system of semi-coherent {1 1 1} interfaces, it is shown that misfit dislocation nodes adopt multiple atomic arrangements corresponding to the creation and redistribution of excess volume at the nodes. Four distinctive node structures were identified: volume-smeared nodes with (i) spiral or (ii) straight dislocation patterns, and volume-condensed nodes with (iii) triangular or (iv) hexagonal dislocation patterns. Volume-smeared nodes contain interfacial dislocations lying in the Cu-Ni interface but volume-condensed nodes contain two sets of interfacial dislocations in the two adjacent interfaces and jogs across the atomic layer between the two adjacent interfaces. Under biaxial tension/compression applied parallel to the interface, it is shown that the nucleation of lattice dislocations is preferred at the nodes and is correlated with the reduction of excess volume at the nodes.

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“…However, due to the presence of such a network, the semi-coherent has the unique ability to facilitate the transmission of lattice dislocation across the interfaces, thereby improving the ductility while maintaining the strength [20][21][22][23][24][25]. The interface dislocations and disconnections introduce strain concentrations and can act as sources for nucleation of lattice dislocations [26][27][28][29][30][31]. However, there are cases where the interface dislocations lose the privilege to nucleate lattice dislocations.…”

Section: Introductionmentioning

confidence: 99%

Relaxation Mechanisms, Structure and Properties of Semi-Coherent Interfaces

Shao

Wang

2015

Metals

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Abstract:In this work, using the Cu-Ni (111) semi-coherent interface as a model system, we combine atomistic simulations and defect theory to reveal the relaxation mechanisms, structure, and properties of semi-coherent interfaces. By calculating the generalized stacking fault energy (GSFE) profile of the interface, two stable structures and a high-energy structure are located. During the relaxation, the regions that possess the stable structures expand and develop into coherent regions; the regions with high-energy structure shrink into the intersection of misfit dislocations (nodes). This process reduces the interface excess potential energy but increases the core energy of the misfit dislocations and nodes. The core width is dependent on the GSFE of the interface. The high-energy structure relaxes by relative rotation and dilatation between the crystals. The relative rotation is responsible for the spiral pattern at nodes. The relative dilatation is responsible for the creation of free volume at nodes, which facilitates the nodes' structural transformation. Several node structures have been observed and analyzed. The various structures have significant impact on the plastic deformation in terms of lattice dislocation nucleation, as well as the point defect formation energies.

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Interface dislocation patterns and dislocation nucleation in face-centered-cubic and body-centered-cubic bicrystal interfaces

Cited by 124 publications

References 53 publications

Interface structures and twinning mechanisms of twins in hexagonal metals

Interface structures and twinning mechanisms of twins in hexagonal metals

Glide dislocation nucleation from dislocation nodes at semi-coherent {1 1 1} Cu–Ni interfaces

Relaxation Mechanisms, Structure and Properties of Semi-Coherent Interfaces

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