Interaction between lattice dislocations and grain boundaries in F.C.C. materials

Pestman, B.J.; Hosson, J.Th.M. De; Vítek, V.; Schapink, F.W.

doi:10.1016/0036-9748(89)90072-0

Cited by 24 publications

(17 citation statements)

References 8 publications

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“…Dislocations may either get absorbed at a boundary or transmitted through it, or emitted from it [7,32]. Of these, absorption mostly occurs at grain boundaries since they are highly disordered and hence have higher energy [34,36]. In comparison, coherent and semicoherent boundaries are lower energy boundaries, whose energy would increase upon dislocation absorption, thus rendering it unfavourable [30,31,37].…”

Section: Methodsmentioning

confidence: 97%

Crystallographic orientation and boundary effects on misorientation development in austenitic stainless steel

Chakrabarty

Mishra

Pant

2014

Materials Science and Engineering: A

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Section: Methodsmentioning

confidence: 97%

Crystallographic orientation and boundary effects on misorientation development in austenitic stainless steel

Chakrabarty

Mishra

Pant

2014

Materials Science and Engineering: A

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“…In a pioneering study Pestman et al [19,20] investigated the DGB interactions for a number of symmetric tilt GBs in Cu, Cu 3 Au and Ni 3 Al. Serra and Bacon reported in a series of papers [21][22][23][24] computer simulation studies of interactions between matrix dislocations and twin boundaries in hcp metals and discussed properties of associated twinning dislocations.…”

Section: Introductionmentioning

confidence: 99%

Atomistic simulations of interactions between the 1 / 2⟨111⟩ edge dislocation and symmetric tilt grain boundaries in tungsten

Cheng¹,

Mrovec²,

Gumbsch³

2008

Philosophical Magazine

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The strength of polycrystals is largely controlled by the interaction between lattice dislocations and grain boundaries. The atomistic details of these interactions are difficult to discern even by advanced high-resolution microscopy methods. In this paper we present results of atomistic simulations of interactions between an edge dislocation and three symmetric tilt grain boundaries in body-centred cubic tungsten. Our simulations reveal that the outcome of the dislocation-grainboundary interaction depends sensitively on the grain boundary structure, the geometry of the slip systems in neighbouring grains, and the precise location of the interaction within the grain boundary. A detailed analysis of the evolution of the grain boundary structures and local stress fields during dislocation absorption and transmission is provided.

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“…In focusing on the specific type of the CSL, the dislocation dissociation has been investigated by MD simulation. [16][17][18][19] They provide the detailed understanding of the dissociation of the Burgers vector of glide dislocation in the interaction process. On the other hand, these MD simulations have difficulty estimating a quantitative reaction property because they are performed under the several specific load conditions such as nanoindentation.…”

mentioning

confidence: 99%

Fundamental interaction process between pure edge dislocation and energetically stable grain boundary

2009

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The interaction between dislocations and grain boundaries is the principal factor for determining the mechanical properties and the plastic deformation behavior of metals. It is possible to control the grain-boundary microstructure and the macroscopic behavior has been widely exploited for scientific and industrial applications. In atomic scale, however, specific interaction characteristics such as the reaction energy and pathway have yet to be revealed. We have investigated the interaction process between a dislocation and an energetically stable grain boundary, and the quantitative characteristics were determined via atomistic transition state analysis. As a result, the interaction energy is found to be 1.16ϫ 10 −1 eV/ Å, which is 10 4 times higher than the Peierls potential. The lattice dislocations subsequently experience anomalous dissociations on the grain boundary, which becomes a key factor for the previously unexplained dislocation disappearance and grain-boundary migration.The dislocation-grain-boundary process is fundamental to the improvement of the mechanical properties of metallic materials. This process contributes significantly to plastic deformation as well as dislocation-dislocation interactions. These lattice defects have been effectively utilized for material strengthening as determined by the Hall-Petch relationship. 1,2 The detailed atomic structure of a low-angle grain boundary has been observed using high-resolution transmission electron microscopy ͑TEM͒. 3 Piled-up dislocations at grain boundaries, as well as the disappearance of dislocations from the interaction between the dislocations and the grain boundaries under indentation-induced stress, have been observed recently by in situ nanoindentation with TEM. 4,5 Computer simulations based on atomistic models have advanced over the last few decades and have allowed us to calculate the properties of typical coincidence site lattice ͑CSL͒. Basic properties of CSL grain boundaries, restricted to low-value CSLs such as ⌺3 and ⌺5, can be calculated by density-functional theory ͑DFT͒. 6 The effect of impurities in these low-sigma CSLs has been investigated. 7-9 Presently, DFT calculations have difficulty in correctly describing the dislocation-grain-boundary system. Atomistic simulations using empirical potentials have been used in a large number of studies of grain boundaries and dislocations. The equilibrium structures and corresponding grain-boundary energies of various kinds of tilt CSLs were investigated. 10 Monte Carlo simulations were carried out for the grain-boundary sliding process and vacancy effect. 11,12 Molecular-dynamics ͑MD͒ simulations have been performed to investigate the nanoscale plastic deformation. [13][14][15] While polycrystalline materials used in actual equipment include various types of grain boundaries, the knowledge and information obtained by observations of the total system cannot be applied directly to nanoscale materials produced by recent miniaturization technology. The fundamental mechanisms of the interactio...

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Interaction between lattice dislocations and grain boundaries in F.C.C. materials

Cited by 24 publications

References 8 publications

Crystallographic orientation and boundary effects on misorientation development in austenitic stainless steel

Crystallographic orientation and boundary effects on misorientation development in austenitic stainless steel

Atomistic simulations of interactions between the 1 / 2⟨111⟩ edge dislocation and symmetric tilt grain boundaries in tungsten

Fundamental interaction process between pure edge dislocation and energetically stable grain boundary

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