Energetic and kinetic aspects of the faceting transformation of a Σ3 grain boundary in Cu

Muschik, T.; Laub, W.; Wolf, U.; Finnis, Michael W.; Gust, W.

doi:10.1016/0956-7151(93)90386-7

Cited by 35 publications

(23 citation statements)

References 17 publications

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“…These interface defects have a pinning effect and prevent the GBs from the evolution or reconstruction into the stabilized GBs. Last, for the adjacent grains in fcc metals that are close to AE3 orientation relationship, it is expected that (1) grain boundaries will be close to the energetically stabilized AE3 GBs, and (2) under mechanical or thermal loading, these GBs could either dissociate into two GBs (one is AE3 GBs) or emit Shockley partial dislocations accompanied with the reconstruction of the GBs [31][32][33][34][35]42].…”

Section: Discussionmentioning

confidence: 99%

“…The HRTEM micrographs of AE3{112} ITBs reveal that the atomic structure has a repeatable pattern with a unit containing three {111} planes [9,27]. Combining topological analysis, atomistic simulations, and HRTEM, we found that AE3{112} ITBs in fcc metals can be represented with a set of Shockley partial dislocations with a repeatable sequence b 2 :b 1 :b 3 on every (111) plane [9,[30][31][32][33][34][35]. This repeatable unit involves three adjacent {111} planes, in good agreement with experimental observation.…”

Section: Introductionmentioning

confidence: 92%

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Structure and stability of Σ3 grain boundaries in face centered cubic metals

Wang

Misra

2013

Philosophical Magazine

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AE3 grain boundaries form as a result of either growth twinning or deformation twinning in face centered cubic (fcc) metals and play a crucial role in determining the mechanical and electrical properties and microstructural stability. We studied the structure and stability of AE3 grain boundaries (GBs) in fcc metals by using topological analysis and atomistic simulations. Atomistic simulations were performed for Cu and Al with empirical interatomic potentials to reveal the influence of stacking fault energy on the morphology of the twinned grains. Three sets of tilt AE3 GBs were studied with respect to the tilt axis parallel to h111i, h112i, and h110i, respectively. We showed that AE3{111} and AE3{112} GBs are thermodynamically stable and the others will dissociate into terraced interfaces regardless of the stacking fault energy. The morphology of the nanotwinned grains in Cu is predicted from the above analysis and found to match with experiments.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

Structure and stability of Σ3 grain boundaries in face centered cubic metals

Wang

Misra

2013

Philosophical Magazine

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“…Similarly, the -plots also allowed an adequate description of GB faceting and roughening by using the coincidence site lattice (superlattice which is common for crystal lattices of both grains forming a GB) [14][15][16][17]. However, this approach is eligible only for small deviations from equilibrium, i.e.…”

Section: Discussionmentioning

confidence: 99%

Reversible transformation of a grain-boundary facet into a rough-to-rough ridge in zinc

Straumal

Горнакова

Sursaeva

2008

Philosophical Magazine Letters

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The transition of two first-order facet-to-rough ridges into a single first-order rough-to-rough ridge theoretically predicted for free surfaces has been observed in a slowly migrating grain boundary (GB). The reversible faceting-roughening transition of the ½10 " 10 tilt GB in a Zn bicrystal has been studied in situ. Above T Rþ ¼ 673 K, the slowly migrating GB semi-circle was discontinuously curved, e.g. two rounded (rough) GB portions intersected with a slope discontinuity. Above T Rþ , a single first-order facet-to-rough GB ridge has been observed. Below T RÀ ¼ 668 K, a facet appeared and intersected with rounded (rough) GB portions with a slope discontinuity. Below T RÀ , two first-order facet-to-rough GB ridges existed. The GB facet and tangents to the rounded (rough) GB portions were parallel to the closely packed planes of the constrained coincidence sites lattice. The steady state length of the facet increased with decreasing temperature. A hysteresis of about 5 K between roughening temperatures measured on heating, T Rþ , and on cooling, T RÀ , was observed. The facet reaches its steady-state length not immediately after a change of sample temperature but with a specific retardation.

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“…Recently, atomistic simulations have provided insight into the interactions of Σ3{111} CTBs with lattice glide dislocations with respect to both the kinetics and energetic of slip transfer across the CTBs . Apart from Σ3{111} CTBs, Σ3{112} incoherent TBs (ITBs) were recently observed in epitaxial nanotwinned Cu films . ITBs in fcc metals have been studied with high‐resolution transmission electron microscopy (HRTEM), molecular static and molecular dynamic (MD) simulations .…”

Section: General Introductionmentioning

confidence: 99%

Review on TEM analysis of growth twins in nanocrystalline palladium thin films: Toward better understanding of twin-related mechanisms in high stacking fault energy metals

Idrissi

Amin-Ahmadi

Wang

et al. 2014

Phys. Status Solidi B

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Various modes of transmission electron microscopy including aberration corrected imaging were used in order to unravel the fundamental mechanisms controlling the formation of growth twins and the evolution of twin boundaries under mechanical and hydrogen loading modes in nanocrystalline (nc) palladium thin films. The latter were produced by electron‐beam evaporation and sputter deposition and subjected to uniaxial tensile deformation as well as hydriding/dehydriding cycles. The results show that the twins form by dissociation of grain boundaries. The coherency of Σ3{111} coherent twin boundaries considerably decreases with deformation due to dislocation/twin boundary interactions while Σ3{112} incoherent twin boundaries dissociate under hydrogen cycling into two‐phase boundaries bounding a new and unstable 9R phase. The effect of these elementary mechanisms on the macroscopic behavior of the palladium films is discussed and compared to recent experimental and simulation works in the literature. The results provide insightful information to guide the production of well‐controlled population of growth twins in high stacking fault energy nc metallic thin films. The results also indicate directions for further enhancement of the mechanical properties of palladium films as needed for instance in palladium‐based membranes in hydrogen applications.

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Energetic and kinetic aspects of the faceting transformation of a Σ3 grain boundary in Cu

Cited by 35 publications

References 17 publications

Structure and stability of Σ3 grain boundaries in face centered cubic metals

Structure and stability of Σ3 grain boundaries in face centered cubic metals

Reversible transformation of a grain-boundary facet into a rough-to-rough ridge in zinc

Review on TEM analysis of growth twins in nanocrystalline palladium thin films: Toward better understanding of twin-related mechanisms in high stacking fault energy metals

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