Edge Dislocations in Inhomogeneous Media

Head, A. K.

doi:10.1088/0370-1301/66/9/309

Cited by 253 publications

(101 citation statements)

References 4 publications

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“…The component of Burgers vector normal to grain boundary is now b n ¼ jbj ¼ a 0 ffiffiffi ffi 10 p % 0:128 nm, where a 0 is the cubic lattice parameter. We confirm this measurement by analytically calculating the stress field associated with such dislocations 22) using the measured bicrystal elastic properties and comparing it with the stress field determined in the simulation, as shown in Fig. 3(a).…”

Section: Resultssupporting

confidence: 71%

Molecular Dynamics Simulation of Ga Penetration along Al Grain Boundaries under a Constant Strain Rate Condition

Yun

Nam

2014

Mater. Trans.

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While diverse fracture characteristics have been observed in liquid metal embrittlement (LME) depending on the solidliquid metal pairs, the penetration of nanometer-thick liquid metal films along the grain boundary has been identified as one of the key mechanisms for embrittlement in many classical LME systems, such as AlGa, CuBi and NiBi. For example, liquid Ga quickly penetrates deep into grain boundaries in Al, leading to intergranular fracture under very small stresses. We report on a series of molecular dynamics simulations of liquid Ga in contact with an Al bicrystal under a constant strain rate. We identify the grain boundary dislocations that are nucleated at the grain boundary groove tip and climb down along the grain boundary during Ga penetration and characterize their atomic structures based on topological method.

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Section: Resultssupporting

confidence: 71%

Molecular Dynamics Simulation of Ga Penetration along Al Grain Boundaries under a Constant Strain Rate Condition

Yun

Nam

2014

Mater. Trans.

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“…First, the stress field caused by the dislocation was obtained from the work of [15]. This was substituted to following equation for the strain energy per unit length of the dislocation [16]:…”

Section: Discussionmentioning

confidence: 99%

Displacive Phase Transformation and Surface Effects Associated with Confocal Laser Scanning Microscopy

Pak

Suh

Bhadeshia

2012

Metall Mater Trans A

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The influence of the free surface on martensitic transformation was examined by comparing the highest temperature at which martensite forms (M S ), as measured using dilatometry, with surface-observations using confocal laser scanning microscopy. It is found that the proximity of the surface during confocal microscopy permits martensitic transformation to occur at a higher temperature, with a reduced free energy change. This is because the strain energy due to the shape deformation accompanying the growth of martensite is reduced at a free surface. The second observation is that plates of martensite tend to coalesce as they approach the free surface where there is reduced constraint. The general observations are backed by calculating the strain-energy due to a sub-surface edge dislocation as a function of the orientation of its Burgers vector relative to the free surface.

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“…This analogy has been used in a recent theoretical study of grain-boundary`di usion wedges' by Gao et al (1999), although they concentrated on timedependent stress relaxation phenomena rather than cracking per se. These workers used Head's (1953) approach to describe the stress ®eld of an array of in®nitesimal edge dislocations, b…x 0 † dx 0 , extending from the free surface (xˆ0) to the tip of the di usion wedge (or crack) at xˆc. For a dislocation at a distance h from the free surface, Head' s solutions for ¼ xx and ¼ yy are…”

Section: } 4 Discussionmentioning

confidence: 99%

The surface topography of cracks in strained In_0.72Ga_0.28P films

Wu¹,

Weatherly²

2000

Philosophical Magazine Letters

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth atThe surface topography of cracks in strained In0.72Ga0.28P films Wu, X.; Weatherly, G. C.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=12744241&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=12744241&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1080/09500830050110468Philosophical magazine letters, 80, 8, pp. 535-541, 2000 PHILOSOPHICAL MAGAZINE LETTERS, 2000 The surface topography of cracks in strained In 0:72 Ga 0:28 P ®lms ABSTRACTCracks in a 2% tensile strained In 0:72 Ga 0:28 P ®lm grown on an InP substrate by molecular-beam epitaxy have been studied by cross-section transmission electron microscopy and scanning probe microscopy. A dislocation analogue (i.e. replacing the crack by an array of equivalent in®nitesimal edge dislocations) is employed to account for the ratio of the crack-opening displacement to the normal surface displacement associated with the crack.

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Edge Dislocations in Inhomogeneous Media

Cited by 253 publications

References 4 publications

Molecular Dynamics Simulation of Ga Penetration along Al Grain Boundaries under a Constant Strain Rate Condition

Molecular Dynamics Simulation of Ga Penetration along Al Grain Boundaries under a Constant Strain Rate Condition

Displacive Phase Transformation and Surface Effects Associated with Confocal Laser Scanning Microscopy

The surface topography of cracks in strained In_0.72Ga_0.28P films

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