“Dislocation–interface” interaction — stress accommodation processes at interfaces

Priester, L.

doi:10.1016/s0921-5093(00)01696-8

Cited by 68 publications

(39 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This view is consistent with the fact that slip along general GBs is typically more complex than in CTBs and may involve dislocation climb or localized shear transformations, both of which are expected to be more difficult than dislocation glide. Moreover, in contrast to CTBs, stress concentrations formed by impinging dislocations may be accommodated more easily by the more disordered atomic structure of general GBs, averting crack initiation 47,48 .…”

Section: Discussionmentioning

confidence: 99%

The dual role of coherent twin boundaries in hydrogen embrittlement

et al. 2015

View full text Add to dashboard Cite

Hydrogen embrittlement (HE) causes engineering alloys to fracture unexpectedly, often at considerable economic or environmental cost. Inaccurate predictions of component lifetimes arise from inadequate understanding of how alloy microstructure affects HE. Here we investigate hydrogen-assisted fracture of a Ni-base superalloy and identify coherent twin boundaries (CTBs) as the microstructural features most susceptible to crack initiation. This is a surprising result considering the renowned beneficial effect of CTBs on mechanical strength and corrosion resistance of many engineering alloys. Remarkably, we also find that CTBs are resistant to crack propagation, implying that hydrogen-assisted crack initiation and propagation are governed by distinct physical mechanisms in Ni-base alloys. This finding motivates a re-evaluation of current lifetime models in light of the dual role of CTBs. It also indicates new paths to designing materials with HE-resistant microstructures.

show abstract

Section: Discussionmentioning

confidence: 99%

The dual role of coherent twin boundaries in hydrogen embrittlement

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Priester and al. [5] have dealt with the case of CFC structural materials and interactions between the matrix dislocations and grain boundaries during plastic deformation [6]. Koning et al [7] and Dewald et al [8][9][10] have used simulations to better understand these interactions.…”

Section: Introductionmentioning

confidence: 99%

Elastic Interaction between Dislocation and Interface in Elastically Anisotropic Ceramic Bimaterials Al<sub>2</sub>O<sub>3</sub>-AlN: Image Force Effect

Aicha¹,

Omar²

2017

ujme

View full text Add to dashboard Cite

The Al 2 O 3 and AlN materials are often used as electrical insulators (electronic substrates) also the case of pressure sensors where the aluminum nitride (AlN) is selected as the piezoelectric layer and the alumina (Al 2 O 3 ) as a solid substrate insulating. This study aims to investigate the mobility of dislocations near the heterophase interface of bimaterials based alumina (Al 2 O 3 ) under the effect of the image force, without the effect of temperature, deformation and external stress These dislocations having a Burgers vector b = 1/3 [112 � 0] , they are located in Al 2 O 3 . The interface is defined by its plane parallel to the dislocation line and disorientation varies between 0 and 180° around the axis [101 � 0]. Usually, the image force calculated in the context of the anisotropic linear elasticity using Barnett and Lothe theory with Stroh formalism, Fi = ∆E / d, where ∆E is the elastic interaction energy. The results show that dislocation motion under the image force effect depends on the elastic and crystallographic properties of the materials constituting the bicrystals and even disorientation of the interface which has an effect on the intensity of the elastic interaction energy. The dislocations are repelled to the interface if the difference in shear modulus between the two materials is positive (∆µ= µ 2 −µ 1 >0), they are attracted to the interface in the opposite case (∆µ= µ 2 −µ 1 <0).

show abstract

“…The long range intergranular stresses associated to these EGBDs have to be relieved in order that other lattice dislocations may enter the GB and that deformation may go on. [2,3] Relaxation may occur by two types of processes: stress transmission in the neighboring crystals or EGBD incorporation in the GB structure. [1][2][3] Incorporation may imply the EGBD decomposition into discrete products or the continuous spreading within the GB of the strain associated to the EGBD.…”

mentioning

confidence: 99%

“…[2,3] Relaxation may occur by two types of processes: stress transmission in the neighboring crystals or EGBD incorporation in the GB structure. [1][2][3] Incorporation may imply the EGBD decomposition into discrete products or the continuous spreading within the GB of the strain associated to the EGBD. [3] It has been proved that the operating mechanisms strongly differ according to the dislocation core structure [4] and to the GB atomic structure.…”

mentioning

confidence: 99%

“…[1][2][3] Incorporation may imply the EGBD decomposition into discrete products or the continuous spreading within the GB of the strain associated to the EGBD. [3] It has been proved that the operating mechanisms strongly differ according to the dislocation core structure [4] and to the GB atomic structure. [1,[5][6][7] It must be emphasized that the EGBD formation and accommodation play an important role in the very first stage of plastic deformation, when the Hall Petch law applies (s ¼ s 0 þ Kd À1/2 , with s the elastic limit, d the grain size, s and K numerical constants).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Interaction Between Dislocations and Grain Boundaries Role in Plastic Deformation

2010

View full text Add to dashboard Cite

Several proceedings have been applied to improve metals and metallic alloys mechanical properties: change of composition, microstructure, and texture changes following various thermo-mechanical treatments. One new hope, based on the different behaviors of grain boundaries under mechanical solicitation, is emerging. The researches in this field are still in their infancy, but the present paper attempts to demonstrate that macroscopic behavior changes are likely to occur due to the modification of the grain boundary distribution in a polycrystal. This requires first to investigate the answer of individual grain boundaries to strains coming mainly from their interactions with the lattice dislocations

show abstract

“Dislocation–interface” interaction — stress accommodation processes at interfaces

Cited by 68 publications

References 32 publications

The dual role of coherent twin boundaries in hydrogen embrittlement

The dual role of coherent twin boundaries in hydrogen embrittlement

Elastic Interaction between Dislocation and Interface in Elastically Anisotropic Ceramic Bimaterials Al<sub>2</sub>O<sub>3</sub>-AlN: Image Force Effect

Interaction Between Dislocations and Grain Boundaries Role in Plastic Deformation

Contact Info

Product

Resources

About