Helical Phononic Modes Induced by a Screw Dislocation
Sign Up to like & getrecommendations! Published in 2024 at "Advanced Functional Materials"
DOI: 10.1002/adfm.202417313
Abstract: A 1D unidirectional phononic waveguide embedded within a 3D hexagonal close‐packed (HCP) phononic crystal is investigated, formed through the introduction of a screw dislocation. This approach does not rely on the non‐trivial topological characteristics of… read more here.
Keywords: helical phononic; phononic modes; induced screw; dislocation ... See more keywords
Twin Nucleation Mechanism from a Screw Dislocation in BCC-Fe
Sign Up to like & getrecommendations! Published in 2024 at "Transactions of the Indian Institute of Metals"
DOI: 10.1007/s12666-024-03490-x
Abstract: Twinning is a predominant deformation mechanism in nanocrystalline materials. The present study uses molecular dynamics simulations to address the feasibility of forming a twin in BCC-Fe via the three-fold dissociation of a screw dislocation, as… read more here.
Keywords: fold dissociation; dissociation; mechanism; three fold ... See more keywords
Shear stress- and line length-dependent screw dislocation cross-slip in FCC Ni
Sign Up to like & getrecommendations! Published in 2017 at "Acta Materialia"
DOI: 10.1016/j.actamat.2016.10.005
Abstract: Abstract Screw dislocation cross-slip is important in dynamic recovery of deformed metals. A mobile screw dislocation segment can cross slip to annihilate an immobile screw dislocation segment with opposite Burgers vector, leaving excess dislocations of… read more here.
Keywords: length; slip; screw dislocation; cross slip ... See more keywords
Chemical misfit origin of solute strengthening in iron alloys
Sign Up to like & getrecommendations! Published in 2017 at "Acta Materialia"
DOI: 10.1016/j.actamat.2017.04.017
Abstract: Abstract In this first-principles study, we investigate the effect of many kinds of substitutional solute species on screw dislocation motion in bcc-Fe, dominating the strength of dilute Fe alloys. Most of the solute species show… read more here.
Keywords: solute species; chemical misfit; first principles; screw dislocation ... See more keywords
Morphological control and kinetics in three dimensions for hierarchical nanostructures growth by screw dislocations
Sign Up to like & getrecommendations! Published in 2019 at "Acta Materialia"
DOI: 10.1016/j.actamat.2018.10.007
Abstract: Abstract The precise control and in-depth understanding of the anisotropic crystal screw dislocation growth could yield further optimization of nanomaterial design and broader applications, yet the studies of rational control and kinetics for more complex… read more here.
Keywords: dislocation growth; screw dislocation; control kinetics; growth ... See more keywords
Theory of screw dislocation strengthening in random BCC alloys from dilute to “High-Entropy” alloys
Sign Up to like & getrecommendations! Published in 2020 at "Acta Materialia"
DOI: 10.1016/j.actamat.2019.10.007
Abstract: Abstract Random body-centered-cubic (BCC) “High Entropy” alloys are a new class of alloys, some having high strength and good ductility at room temperature and some having exceptional high-temperature strength. There are no theories of strengthening… read more here.
Keywords: entropy alloys; bcc; high entropy; screw dislocation ... See more keywords
Screw dislocation-carbon interaction in BCC tungsten: an ab initio study
Sign Up to like & getrecommendations! Published in 2020 at "Acta Materialia"
DOI: 10.1016/j.actamat.2020.09.014
Abstract: Abstract The interaction between carbon and screw dislocations in tungsten is investigated using ab initio calculations. The presence of carbon atoms in the vicinity of the dislocation induces a reconstruction, with the dislocation relaxing to… read more here.
Keywords: carbon; dislocation; interaction; carbon atoms ... See more keywords
Cross-kinks control screw dislocation strength in equiatomic bcc refractory alloys
Sign Up to like & getrecommendations! Published in 2021 at "Acta Materialia"
DOI: 10.1016/j.actamat.2021.116875
Abstract: Abstract Refractory multi-element alloys (RMEA) with body-centered cubic (bcc) structure have been the object of much research over the last decade due to their high potential as candidate materials for high-temperature applications. Most of these… read more here.
Keywords: control screw; bcc; screw dislocation; strength equiatomic ... See more keywords
Screw dislocation assisted spontaneous growth of single-crystalline α-Al2O3 microrods
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DOI: 10.1016/j.coco.2018.08.003
Abstract: Abstract Herein we reported a simple chemical vapor deposition approach to synthesize single crystal α-Al2O3 microrods with diameters of 2–4 μm and lengths of 10–30 μm on the as-prepared SiC-Si-Al2O3 ceramics based on the screw dislocation growth.… read more here.
Keywords: dislocation; al2o3 microrods; growth; dislocation growth ... See more keywords
A continuum theory of screw dislocation equilibrium
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Engineering Science"
DOI: 10.1016/j.ijengsci.2017.03.012
Abstract: Abstract Large ensembles of screw dislocations can be described by a continuum theory. One such theory was derived from homogenization reasoning by Berdichevsky (International Journal of Engineering Science, 106 , 10-28, 2016). In the paper,… read more here.
Keywords: dislocation equilibrium; theory; continuum theory; theory screw ... See more keywords
Screw dislocation in a thin film with surface effects
Sign Up to like & getrecommendations! Published in 2017 at "International Journal of Solids and Structures"
DOI: 10.1016/j.ijsolstr.2017.01.041
Abstract: Abstract We use conformal mapping techniques to derive a semi-analytical solution to the problem of a (straight) screw dislocation embedded in a thin solid film. The surfaces of the film are assumed to incorporate surface… read more here.
Keywords: surface effects; surfaces film; dislocation; film ... See more keywords