Crystal Defects and Crystalline Interfaces

Bollmann, W.

doi:10.1007/978-3-642-49173-3

Cited by 1,266 publications

(637 citation statements)

References 0 publications

Supporting

Mentioning

603

Contrasting

Unclassified

Order By: Relevance

“…[5]-i.e., a smaller GB unit cell-which in turn may lead to lower GB energy [50]. The spacing between any intrinsic GB defects, such as misfit dislocations [15,51], may also be different in our models than in the experiments. However, none of the GBs studied here are formed by joining two minimal-index or closest-packed crystallographic planes, such as {100}, {110}, or {111}, so none of them exhibit a high degree of coherency.…”

Section: Atomic Models Of Selected Grain Boundariesmentioning

confidence: 98%

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Demkowicz

2015

J Mater Sci

View full text Add to dashboard Cite

We use atomistic modeling to study the response of three non-coherent grain boundaries (GBs) in Cu to continuous loading with vacancies. Our simulations yield insights into the structure and properties of these boundaries both near and far from thermal equilibrium. We find that GB energies vary periodically as a function of the number of vacancies introduced. Each GB has a characteristic minimum energy state that recurs during continuous vacancy loading, but in general cannot be reached without removing atoms from the boundary. There is no clear correlation of GB energies with GB specific excess volumes or stresses during vacancy loading. However, GB stresses increase monotonically with specific excess volumes. Continuous vacancy loading gives rise to GB migration and shearing, despite the absence of applied loads. Successive vacancies introduced into some of the boundaries accumulate at the cores of what appear to be generalized vacancy dislocation loops. We discuss the implications of these findings for our understanding of grain boundary sink efficiencies under light ion irradiation.

show abstract

Section: Atomic Models Of Selected Grain Boundariesmentioning

confidence: 98%

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Demkowicz

2015

J Mater Sci

View full text Add to dashboard Cite

show abstract

“…There, the mismatch is 3.1% whereas in the present case it is 4.6% (isotropic over the interface). According to predictions of the O lattice [36], for this type of interface a square network of edge dislocations is expected with line direction ͗110͘ and Burgers vector 1/2͗110͘. Analysis of the plane bending observed in HRTEM images for viewing along Ag͗100͘ʈMgO͗100͘ indicated, according to [35], that instead edge dislocations with line direction ͗100͘ and Burgers vector 1/2͗100͘ were present.…”

Section: Resultsmentioning

confidence: 88%

Influence of misfit and interfacial binding energy on the shape of the oxide precipitates in metals

Kooi

Hosson

2000

Acta Materialia

View full text Add to dashboard Cite

Influence of misfit and interfacial binding energy on the shape of the oxide precipitates in metals; Interfaces between Mn3O4 precipitates and Pd studied with HRTEM Kooi, B.J.; de Hosson, J.T.M. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. (1) the anisotropy in interface energy for oxide precipitates in a metal matrix is substantial due to the ionic nature of the oxide, giving well-defined shapes associated with the Wulff construction; (2) the influence of misfit energy on the precipitate shape as bounded by semi-coherent interfaces is important only if sufficient anisotropy in mismatch is present and if the matrix is sufficiently stiff; and (3) the stronger coupling strength due to electronic binding effects across the interface in Pd compared with Ag is responsible for formation of the dislocation network structures at larger misfit.

show abstract

“…29 This localized periodic structure will probably serve as the reference structure preserved between dislocations, which is called a favoured boundary by Sutton and Vitek, 29 and a preferred state by Bollmann. 25,30 The term of preferred state will be followed in this paper. The association between the GMS clusters and the locations of the preferred state implies potential dislocations between the GMS clusters.…”

Section: Integrated Frameworkmentioning

confidence: 99%

Faceted interfaces: a key feature to quantitative understanding of transformation morphology

Zhang

Dai

2016

npj Comput Mater

View full text Add to dashboard Cite

Faceted interfaces are a typical key feature of the morphology of many microstructures generated from solid-state phase transformations. Interpretation, prediction and simulation of this faceted morphology remain a challenge, especially for systems where irrational orientation relationships (ORs) between two phases and irrational interface orientations (IOs) are preferred. In terms of structural singularities, this work suggests an integrated framework, which possibly encompasses all candidates of faceted interfaces. The structural singularities are identified from a matching pattern, a dislocation structure and/or a ledge structure. The resultant singular interfaces have discrete IOs, described with low-index g's (rational orientations) and/or Δg's (either rational or irrational orientations). Various existing models are grouped according to their determined results regarding the OR and IO, and the links between the models are clarified in the integrated framework. Elimination of defect types as far as possible in a dominant singular interface often exerts a central restriction on the OR. An irrational IO is usually due to the elimination of dislocations in one direction, i.e., an O-line interface. Analytical methods using both three-dimensional and two-dimensional models for quantitative determinations of O-line interfaces are reviewed, and a detailed example showing the calculation for an irrational interface is given. The association between structural singularities and local energy minima is verified by atomistic calculations of interfacial energies in fcc/bcc alloys where it is found that the calculated equilibrium cross-sections are in a good agreement with observations from selected alloys.

show abstract

Crystal Defects and Crystalline Interfaces

Cited by 1,266 publications

References 0 publications

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Non-coherent Cu grain boundaries driven by continuous vacancy loading

Influence of misfit and interfacial binding energy on the shape of the oxide precipitates in metals

Faceted interfaces: a key feature to quantitative understanding of transformation morphology

Contact Info

Product

Resources

About