Convex combination: Difference between revisions

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The setof all such convex combinations is the set of points in the interior of the convex hull, not the convex hull itself which is a subset of this set.
 
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{{two other uses||the syntactic operation|Dislocation (syntax)|the medical term|Joint dislocation}}
Over time, the data on a hard drive gets scattered. Defragmenting the hard drive puts your information back into sequential order, making it simpler for Windows to access it. As a outcome, the performance of the computer may better. An great registry cleaner usually allow work this task. However in the event you would like to defrag the PC with Windows software. Here a link to show you how.<br><br>Before really getting the software it's best to check on the firms that create the software. If you can find details found on the type of standing each organization has, maybe the risk of malicious programs is reduced. Software from reputed companies have assisted me, and other users, to make my PC run faster.. If the product description refuses to look superior to you, refuses to include details regarding the software, does not include the scan functions, you need to go for another one that ensures you're paying for what we desire.<br><br>It doesn't matter whether you are not especially obvious regarding what rundll32.exe is. However remember which it plays an significant role in sustaining the stability of our computers plus the integrity of the system. Whenever certain software or hardware might not answer usually to a system procedure, comes the rundll32 exe error, that might be caused by corrupted files or missing information inside registry. Usually, error content usually shows up at booting or the beginning of running a program.<br><br>In order to remove the programs on your computer, Windows Installer must be inside a healthy state. If its installation is corrupted you will get error 1721 in Windows 7, Vista and XP during the program removal process. Simply re-registering its component files would solve your issue.<br><br>So to fix this, we simply should be able to make all the registry files non-corrupted again. This may dramatically accelerate the loading time of the computer plus can allow you to a big number of details on it again. And fixing these files couldn't be easier - we only want to utilize a tool called a [http://bestregistrycleanerfix.com/tune-up-utilities tuneup utilities 2014].<br><br>Another factor is registry. It is one of the most crucial part inside a Windows XP, Vista operating systems. When Windows start, it read associated information from registry plus load into computer RAM. This takes up a big piece of the startup time. After the data is all loaded, computer runs the startup programs.<br><br>Your registry is the area all the important configurations for hardware, software and consumer profile configurations plus needs are stored. Every time 1 of these aspects is changed, the database then begins to expand. Over time, the registry may become bloated with unnecessary files. This causes a general slow down nevertheless in extreme cases may result significant jobs plus programs to stop working all together.<br><br>All of these issues usually be easily solved by the clean registry. Installing the registry cleaner allows you to use a PC without worries behind. You can capable to utilize we program without being afraid which it's going to crash in the middle. Our registry cleaner might fix a host of errors on a PC, identifying lost, invalid or corrupt settings inside the registry.
 
In [[materials science]], a '''dislocation''' is a [[crystallographic defect]], or irregularity, within a [[crystal structure]]. The presence of dislocations strongly influences many of the properties of materials. The theory describing the elastic fields of the defects was originally developed by [[Vito Volterra]] in 1907,<ref>[[Vito Volterra]] (1907) [https://eudml.org/doc/81250 "Sur l'équilibre des corps élastiques multiplement connexes"], ''Annales scientifiques de l'École Normale Supérieure, Vol. 24, pp. 401–517</ref> but the term 'dislocation' to refer to a defect on the atomic scale was coined by [[G. I. Taylor]] in 1934.<ref>
{{cite journal|author=[[G. I. Taylor]]|title=The Mechanism of Plastic Deformation of Crystals. Part I. Theoretical|journal= Proceedings of the Royal Society of London. Series A|volume=145|issue=855|year=1934|pages=362–387|doi=10.1098/rspa.1934.0106|jstor=2935509}}</ref> Some types of dislocations can be visualized as being caused by the termination of a plane of [[atom]]s in the middle of a [[crystal]]. In such a case, the surrounding [[plane (mathematics)|planes]] are not straight, but instead they bend around the edge of the terminating plane so that the crystal structure is perfectly ordered on either side. The analogy with a stack of paper is apt: if half a piece of paper is inserted in a stack of paper, the defect in the stack is only noticeable at the edge of the half sheet.
 
There are two primary types: ''edge dislocations'' and ''screw dislocations''.  ''Mixed dislocations'' are intermediate between these.
 
[[Image:Edge dislocation.svg|thumbnail|right|An edge-dislocation (b = [[Burgers vector]])]]
 
Mathematically, dislocations are a type of [[topological defect]], sometimes called a [[soliton]]. The mathematical theory explains why dislocations behave as stable particles: they can be moved around, but they maintain their identity as they move. Two dislocations of opposite orientation, when brought together, can cancel each other (this is the process of [[annihilation]]), but a single dislocation typically cannot "disappear" on its own.
 
==Dislocation geometry==
[[Image:Dislocation edge b.jpg|right|thumb|'''Figure A''' Crystal lattice showing atoms and lattice planes]]
 
Two main types of dislocation exist: edge and screw. Dislocations found in real materials typically are ''mixed'', meaning that they have characteristics of both.
 
A crystalline material consists of a regular array of atoms, arranged into lattice planes (imagine stacking oranges in a grocery, each of the trays of oranges are the lattice planes). One approach is to begin by considering a 3D representation of a perfect crystal lattice, with the atoms represented by spheres. The viewer may then start to simplify the representation by visualising planes of atoms instead of the atoms themselves (Figure A).
 
[[Image:Dislocation edge d2.svg|right|thumb|'''Figure B''' Schematic diagram (lattice planes) showing an edge dislocation. Burgers vector in black, dislocation line in blue.]]
 
===Edge dislocations===
An edge dislocation is a defect where an extra half-plane of atoms is introduced mid way through the crystal, distorting nearby planes of atoms. When enough force is applied from one side of the crystal structure, this extra plane passes through planes of atoms breaking and joining bonds with them until it reaches the grain boundary. A simple schematic diagram of such atomic planes can be used to illustrate lattice defects such as dislocations. (Figure B represents the "extra half-plane" concept of an edge type dislocation). The dislocation has two properties, a line direction, which is the direction running along the bottom of the extra half plane, and the [[Burgers vector]] which describes the magnitude and direction of distortion to the lattice. In an edge dislocation, the Burgers vector is perpendicular to the line direction. (see also [[Jog (dislocations)]])
 
The stresses caused by an edge dislocation are complex due to its inherent asymmetry. These stresses are described by three equations:<ref name="rhill">R. E. Reed-Hill (1994) "Physical Metallurgy Principles" ISBN 0-534-92173-6</ref>
 
<math> \sigma_{xx} = \frac {-\mu b} {2 \pi (1-\nu)} \frac {y(3x^2 +y^2)} {(x^2 +y^2)^2}</math>
 
<math> \sigma_{yy} = \frac {\mu b} {2 \pi (1-\nu)} \frac {y(x^2 -y^2)} {(x^2 +y^2)^2}</math>
 
<math> \tau_{xy} = \frac {\mu b} {2 \pi (1-\nu)} \frac {x(x^2 -y^2)} {(x^2 +y^2)^2}</math>
 
where μ is the [[shear modulus]] of the material, b is the [[Burgers vector]], ν is [[Poisson's ratio]] and x and y are coordinates.
 
These equations suggest a vertically oriented dumbbell of stresses surrounding the dislocation, with compression experienced by the atoms near the "extra" plane, and tension experienced by those atoms near the "missing" plane.<ref name="rhill"/>
 
===Screw dislocations===
[[Image:Vector de Burgers.PNG|thumb|Top right: edge dislocation.<br>Bottom right: screw dislocation.]]
[[Image:Dislocation screw e.svg|left|thumb|'''Figure C''' Schematic diagram (lattice planes) showing a screw dislocation.]]
 
A ''screw dislocation'' is much harder to visualize. Imagine cutting a crystal along a plane and slipping one half across the other by a lattice vector,  the halves fitting back together without leaving a defect. If the cut only goes part way through the crystal, and then slipped, the boundary of the cut is a screw dislocation. It comprises a structure in which a [[helical]] path is traced around the linear defect (dislocation line) by the atomic planes in the crystal lattice (Figure C). Perhaps the closest analogy is a spiral-sliced ham. In pure screw dislocations, the Burgers vector is parallel to the line direction.<ref>{{cite book|author=James Shackelford|title=Introduction to Materials Science for Engineers|year=2009|publisher=Pearson Prentice Hall|location=Upper Saddle River, NJ 07458|isbn=0-13-601260-4|pages=110–111|edition=7th}}</ref>
 
Despite the difficulty in visualization, the stresses caused by a screw dislocation are less complex than those of an edge dislocation. These stresses need only one equation, as symmetry allows only one radial coordinate to be used:<ref name="rhill"/>
 
<math> \tau_{r} = \frac {-\mu b} {2 \pi r} </math>
 
where μ is the [[shear modulus]] of the material, b is the Burgers vector, and r is a radial coordinate.
This equation suggests a long cylinder of stress radiating outward from the cylinder and decreasing with distance. Please note, this simple model results in an infinite value for the core of the dislocation at r=0 and so it is only valid for stresses outside of the core of the dislocation.<ref name="rhill"/> If the Burgers vector is very large, the core may actually be empty resulting in a [[micropipe]], as commonly observed in [[silicon carbide]].
 
===Mixed dislocations===
In many materials, dislocations are found where the line direction and Burgers vector are neither perpendicular nor parallel and these dislocations are called ''mixed dislocations'', consisting of both screw and edge character.
 
===Partial Dislocations===
Dislocations can decompose into [[Partial Dislocations|partial dislocations]] in order to facilitate movement through a crystal lattice.
 
==Observation of dislocations==
[[Image:TEM micrograph dislocations precipitate stainless steel 1.jpg|right|thumb|[[Transmission electron micrograph]] of dislocations]]
 
When a dislocation line intersects the surface of a metallic material, the associated strain field locally increases the relative susceptibility of the material to acidic [[industrial etching|etching]] and an [[etch pit density|etch pit]] of regular geometrical format results. If the material is strained (deformed) and repeatedly re-etched, a series of etch pits can be produced which effectively trace the movement of the dislocation in question.
 
[[Image:TEM micrograph dislocations precipitate stainless steel 2.jpg|right|thumb|Transmission electron micrograph of dislocations]]
[[Transmission electron microscopy]] can be used to observe dislocations within the [[microstructure]] of the material. Thin foils of metallic samples are prepared to render them transparent to the electron beam of the microscope. The [[electron]] beam suffers [[diffraction]] by the regular crystal lattice planes of the metal atoms and the differing relative angles between the beam and the lattice planes of each grain in the metal's  microstructure result in image contrast (between grains of different crystallographic orientation). The less regular atomic structures of the [[grain boundaries]] and in the strain fields around dislocation lines have different diffractive properties than the regular lattice within the grains, and therefore present different contrast effects in the electron micrographs. (The dislocations are seen as dark lines in the lighter, central region of the micrographs on the right). Transmission electron micrographs of dislocations typically utilize magnifications of 50,000 to 300,000 times (though the equipment itself offers a wider range of magnifications than this). Some microscopes also permit the in-situ heating and/or deformation of samples, thereby permitting the direct observation of dislocation movement and their interactions. Note the characteristic 'wiggly' contrast of the dislocation lines as they pass through the thickness of the material. Note also that a dislocation cannot end within a crystal; the dislocation lines in these images end at the sample surface. A dislocation can only be contained within a crystal as a complete loop.
 
[[Field ion microscopy]] and [[atom probe]] techniques offer methods of producing much higher magnifications (typically 3 million times and above) and permit the observation of dislocations at an atomic level. Where surface relief can be resolved to the level of an atomic step, screw dislocations appear as distinctive spiral features – thus revealing an important mechanism of crystal growth: where there is a surface step, atoms can more easily add to the crystal, and the surface step associated with a screw dislocation is never destroyed no matter how many atoms are added to it.
 
(By contrast, traditional [[optical microscopy]], which is not appropriate for the ''direct'' observation of dislocations, typically offers magnifications up to a maximum of only around 2000 times).
 
After chemical etching, small pits are formed where the etching solution preferentially attacks the sample surface around the dislocations intercepting this surface, due to the more highly strained state of the material . Thus, the image features indicate points at which dislocations intercept the sample surface. In this way, dislocations in silicon, for example, can be observed ''indirectly'' using an interference microscope. Crystal orientation can be determined by the shape of the etch pits associated with the dislocations (in the case of the illustration below;  100 elliptical, 111 – triangular/pyramidal).
 
<gallery>
 
Image:Silicon_dislocation_orientation_100_mag_500x.png|Dislocations in silicon, orientation 100
 
Image:Silicon_dislocation_orientation_111_mag_500x.png|Dislocations in silicon, orientation 111
 
Image:Silicon_dislocation_orientation_111_mag_500x_2.png|Dislocation in silicon, orientation 111
 
</gallery>
 
==Sources of dislocations==
Dislocation density in a material can be increased by plastic deformation by the following relationship: <math>\tau \propto \rho^{1/2}</math>.  Since the dislocation density increases with plastic deformation, a mechanism for the creation of dislocations must be activated in the material. Three mechanisms for dislocation formation are homogeneous nucleation, grain boundary initiation, and interfaces between the lattice and the surface, precipitates, dispersed phases, or reinforcing fibers.
 
The creation of a dislocation by homogeneous nucleation is a result of the rupture of the atomic bonds along a line in the lattice.  A plane in the lattice is sheared, resulting in 2 oppositely faced half planes or dislocations.  These dislocations move away from each other through the lattice.  Since homogeneous nucleation forms dislocations from perfect crystals and requires the simultaneous breaking of many bonds, the energy required for homogeneous nucleation is high. For instance the stress required for homogeneous nucleation in copper has been shown to be <math> \frac {\tau_{hom}}{G}=7.4\times10^{-2}</math>, where G is the shear modulus of copper (46 GPa). Solving for <math>\tau_{hom} \,\!</math>, we see that the required stress is 3.4 GPa, which is very close to the theoretical strength of the crystal. Therefore, in conventional deformation homogeneous nucleation requires a concentrated stress, and is very unlikely.  Grain boundary initiation and interface interaction are more common sources of dislocations.
 
Irregularities at the grain boundaries in materials can produce dislocations which propagate into the grain.  The steps and ledges at the grain boundary are an important source of dislocations in the early stages of plastic deformation.
 
The surface of a crystal can produce dislocations in the crystal.  Due to the small steps on the surface of most crystals, stress in certain regions on the surface is much larger than the average stress in the lattice.  The dislocations are then propagated into the lattice in the same manner as in grain boundary initiation.  In single crystals, the majority of dislocations are formed at the surface.  The dislocation density 200 micrometres into the surface of a material has been shown to be six times higher than the density in the bulk.  However, in polycrystalline materials the surface sources cannot have a major effect because most grains are not in contact with the surface.
 
The interface between a metal and an oxide can greatly increase the number of dislocations created.  The oxide layer puts the surface of the metal in tension because the oxygen atoms squeeze into the lattice, and the oxygen atoms are under compression.  This greatly increases the stress on the surface of the metal and consequently the amount of dislocations formed at the surface. The increased amount of stress on the surface steps results in an increase of dislocations.<ref>Marc André Meyers, Krishan Kumar Chawla (1999) ''Mechanical Behaviors of Materials.'' Prentice Hall, pp. 228–231, ISBN 0132628171.</ref>
 
<gallery caption="The stresses produced by a dislocation source may be visualized by photoelasticity in a gamma-irradiated LiF single crystal. The tensile stress along the glide plane is red. The compressive stress is dark green:" widths="300px" heights="300px" perrow="6">
Image:Plan de glissement.JPG|Dislocation source (schematic)
File:Dislocation pile up.jpg|LiF irradiated with gamma.  The slip plane is visible as a diagonal line, with compressive forces showing green and tensile forces showing red.
</gallery>
 
==Dislocations, slip and plasticity==
{{main|Dislocation creep}}
 
Until the 1930s, one of the enduring challenges of materials science was to explain [[plasticity (physics)|plasticity]] in microscopic terms. A simplistic attempt to calculate the [[shear stress]] at which neighbouring atomic planes ''slip'' over each other in a perfect crystal suggests that, for a material with [[shear modulus]] ''G'', shear strength τ<sub>''m''</sub> is given approximately by:
 
<math> \tau_m = \frac {G} {2 \pi\ }. \, </math>
 
As shear modulus in [[metal]]s is typically within the range 20 000 to 150 000 [[MPa]], this is difficult to reconcile with shear stresses in the range 0.5 to 10 MPa observed to produce plastic deformation in experiments.
 
In 1934, [[Egon Orowan]], [[Michael Polanyi]] and [[Geoffrey Ingram Taylor|G. I. Taylor]], almost simultaneously realized that plastic deformation could be explained in terms of the theory of dislocations. Dislocations can move if the atoms from one of the surrounding planes break their bonds and rebond with the atoms at the terminating edge. In effect, a half plane of atoms is moved in response to shear stress by breaking and reforming a line of bonds, one (or a few) at a time. The energy required to break a single bond is far less than that required to break all the bonds on an entire plane of atoms at once. Even this simple model of the force required to move a dislocation shows that plasticity is possible at much lower stresses than in a perfect crystal. In many materials, particularly ductile materials, dislocations are the "carrier" of plastic deformation, and the energy required to move them is less than the energy required to fracture the material. Dislocations give rise to the characteristic malleability of metals.
 
When metals are subjected to "[[cold working]]" (deformation at temperatures which are relatively low as compared to the material's absolute melting temperature, ''T<sub>m</sub>'', i.e., typically less than 0.4&nbsp;''T<sub>m</sub>'') the dislocation density increases due to the formation of new dislocations and dislocation multiplication. The consequent increasing overlap between the strain fields of adjacent dislocations gradually increases the resistance to further dislocation motion. This causes a hardening of the metal as deformation progresses. This effect is known as [[strain hardening]] (also “work hardening”). Tangles of dislocations are found at the early stage of deformation and appear as non well-defined boundaries; the process of dynamic [[recovery (metallurgy)|recovery]] leads eventually to the formation of a cellular structure containing boundaries with misorientation lower than 15° (low angle grain boundaries). In addition, adding pinning points that inhibit the motion of dislocations, such as alloying elements, can introduce stress fields that ultimately strengthen the material by requiring a higher applied stress to overcome the pinning stress and continue dislocation motion.
 
The effects of strain hardening by accumulation of dislocations and the grain structure formed at high strain can be removed by appropriate heat treatment ([[Annealing (metallurgy)|annealing]]) which promotes the [[recovery (metallurgy)|recovery]] and subsequent [[Recrystallization (metallurgy)|recrystallisation]] of the material.
 
The combined processing techniques of [[work hardening]] and [[Annealing (metallurgy)|annealing]] allow for control over dislocation density, the degree of dislocation entanglement, and ultimately the [[yield strength]] of the material.
 
==Dislocation climb==
Dislocations can slip in planes containing both the dislocation and the Burgers Vector.  For a screw dislocation, the dislocation and the Burgers vector are parallel, so the dislocation may slip in any plane containing the dislocation. For an edge dislocation, the dislocation and the Burgers vector are perpendicular, so there is only one plane in which the dislocation can slip.  There is an alternative mechanism of dislocation motion, fundamentally different from slip, that allows an edge dislocation to move out of its slip plane, known as dislocation climb.  Dislocation climb allows an edge dislocation to move perpendicular to its slip plane.
 
The driving force for dislocation climb is the movement of vacancies through a crystal lattice.  If a vacancy moves next to the boundary of the extra half plane of atoms that forms an edge dislocation, the atom in the half plane closest to the vacancy can "jump" and fill the vacancy. This atom shift "moves" the vacancy in line with the half plane of atoms, causing a shift, or positive climb, of the dislocation. The process of a vacancy being absorbed at the boundary of a half plane of atoms, rather than created, is known as negative climb.  Since dislocation climb results from individual atoms "jumping" into vacancies, climb occurs in single atom diameter increments.
 
During positive climb, the crystal shrinks in the direction perpendicular to the extra half plane of atoms because atoms are being removed from the half plane. Since negative climb involves an addition of atoms to the half plane, the crystal grows in the direction perpendicular to the half plane. Therefore, compressive stress in the direction perpendicular to the half plane promotes positive climb, while tensile stress promotes negative climb. This is one main difference between slip and climb, since slip is caused by only shear stress.
 
One additional difference between dislocation slip and climb is the temperature dependence.  Climb occurs much more rapidly at high temperatures than low temperatures due to an increase in vacancy motion.  Slip, on the other hand, has only a small dependence on temperature.
 
== References ==
{{reflist}}
 
== Further reading ==
* Reed-Hill, R. E. (1994) "Physical Metallurgy Principles" ISBN 0-534-92173-6
* Dieter, G. E. (1986) ''Mechanical Metallurgy'' ISBN 0-07-100406-8
* Honeycombe, R.W.K. (1984) ''The Plastic Deformation of Metals'' ISBN 0-7131-2181-5
* Hull, D. & Bacon, D. J. (1984) ''Introduction to Dislocations'' ISBN 0-08-028720-4
* [[Hagen Kleinert|Kleinert, Hagen]], ''Gauge Fields in Condensed Matter'', Vol. II,  "[[Stress (physics)|STRESSES]] AND [[Crystallographic defect|DEFECTS]]; [[Differential Geometry]], [[Melting|Crystal Melting]]", pp.&nbsp;743–1456,  World Scientific (Singapore, 1989);  Paperback ISBN 9971-5-0210-0 '' (readable online [http://www.physik.fu-berlin.de/~kleinert/kleiner_reb1/contents2.html here])''
* Read, W. T. Jr. (1953) ''Dislocations in Crystals'' ISBN 1-114-49066-0
* "Atomistically-informed Dislocation Dynamics in fcc Crystals", E. Martinez, J. Marian, A. Arsenlis, M. Victoria, J. M. Perlado, Journal of the Mechanics and Physics of Solids, Volume 56, Issue 3, March 2008, Pages 869–895
*{{cite book |last=Markenscoff |first=Xanthippi |authorlink= |coauthors= Anurag Gupta|title=Collected Works of J.D. Eshelby, the Mechanics of Defects and Inhomogeneities|year=2006 |publisher=Springer |location= |isbn= 1-4020-4416-X }}
 
==External links==
{{wiktionary|dislocation}}
{{Commons category|Dislocations in crystals}}
*[http://www.tf.uni-kiel.de/matwis/amat/def_en/index.html Defects in Crystals/ Prof. Dr. Helmut Föll website] Chapter 5 contains a wealth of information on dislocations;
*[http://www.doitpoms.ac.uk/tlplib/dislocations/ DoITPoMS] Online tutorial on dislocations, including movies of dislocations in [[bubble raft]]s;
*[http://www.iap.tuwien.ac.at/www/surface/STM_Gallery/ Scanning Tunneling Microscope – Gallery] Image gallery, including a dislocations page, seen at the atomic level of metal surfaces, by the surface physics group at the Faculty of Physics, Vienna University of Technology, Austria.
*[http://neo-classical-physics.info/uploads/3/0/6/5/3065888/volterra_-_equilibrium_of_multiply_connected_bodies.pdf Volterra, V., "On the equilibrium of multiply-connected bodies," trans. by D. H. Delphenich]
*[http://neo-classical-physics.info/uploads/3/0/6/5/3065888/somigliana_-_distortions.pdf Somigliana, C., "On the theory of elastic distortions," transl. by D. H. Delphenich]
 
[[Category:Crystallographic defects]]
 
{{Link GA|zh}}
[[ar:عيوب بلورية#العيوب الخطية]]

Latest revision as of 14:30, 5 June 2014

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