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Deformation mechanism in crystalline materials
Dislocation creep is a deformation mechanism in crystalline materials. Dislocation creep involves the movement of dislocations through the crystal lattice
Dislocation_creep
Property of solid materials under mechanical stress
creep is controlled by the movement of dislocations. For dislocation creep, Q = Q(self diffusion), 4 ≤ m ≤ 6, and b < 1. Therefore, dislocation creep
Creep_(deformation)
Microscopic processes responsible for changes in a material's structure, shape and volume
§ Cataclastic flow § Grain boundary sliding § Diffusive mass transfer § Dislocation creep § Dynamic recrystallization (recovery) Fracturing is a brittle deformation
Deformation_mechanism
Mechanism of crystalline solid deformation
levels and higher temperatures than creep mechanisms utilizing dislocation glide. Coble creep occurs through the diffusion of atoms in a material along grain
Coble_creep
Gradual movement of the planet's mantle
upper mantle, a variety of creep processes can occur, with dislocation creep dominating in the lower mantle and diffusional creep occasionally dominating
Mantle_convection
Topics referred to by the same term
permanently under the influence of stresses Coble creep Diffusion creep Dislocation creep Nabarro–Herring creep Creep, the advancing of a railway wheel more or
Creep
Linear crystallographic defect or irregularity
boundary sliding, creep, and fracture behavior The stresses caused by a screw dislocation are less complex than those of an edge dislocation and need only
Dislocation
Highly viscous, ductile, and mechanically weak region of Earth's mantle
is partly caused by their motion itself, thanks to the non-linear dislocation creep mechanism. Numerical models of mantle convection in which the viscosity
Asthenosphere
Heat treatment technique used to increase the yield strength of malleable materials
these same precipitates in the grains might interact with dislocations under creep dislocation creep conditions. Secondary Precipitates Different precipitates
Precipitation_hardening
Alloy with higher durability than normal metals
particular purpose in optimizing properties. Creep resistance is dependent, in part, on slowing the speed of dislocation motion within a crystal structure. In
Superalloy
Metamorphic rock
In crustal rocks the most important processes are dislocation creep and diffusion creep. Dislocation generation acts to increase the internal energy of
Mylonite
sometimes written GlidCop or GLIDCOP. The aluminum oxide particles block dislocation creep, which retards recrystallization and prevents grain growth; thus preserving
Glidcop
Diffusion creep refers to the deformation of crystalline solids by the diffusion of vacancies through their crystal lattice. Diffusion creep results in
Diffusion_creep
Austenitic nickel-chromium superalloys
engine parts. Creep mechanism: In the operational temperature range of 650*C to 700*C, the dominant creep mechanism is identified as dislocation climb. This
Inconel
One of the main minerals in the Earth's lower mantle
of the lower mantle suggests that silicate perovskite deforms by a dislocation creep mechanism. This may help explain the observed seismic anisotropy in
Silicate_perovskite
Material deformation mechanism
the creep strain (εNH). The creep strain rate is derived in the next section. NH creep is more important in ceramics than metals as dislocation motion
Nabarro–Herring_creep
American geologist
from brittle fracturing to cataclastic flow to dislocation creep and melt or fluid-enhanced diffusion creep. These experiments investigated the role of phase
Jan_Tullis
Non-reversible deformation of a solid material in response to applied forces
along the single crystal surfaces, respectively, as well as dislocation climb-glide creep. During the easy glide stage 1, the work hardening rate, defined
Plasticity_(physics)
Metal alloy with copper as its principal component
mechanisms are to slow down creep deformation, and the various mechanisms that contribute to it such as dislocation glide, dislocation glide, and vacancy diffusion
List_of_copper_alloys
Composite material
interfacial energy, which impedes dislocation. The oxide particles instead are stable in the matrix, which helps prevent creep. Particle stability implies little
Oxide dispersion-strengthened alloy
Oxide_dispersion-strengthened_alloy
Concept in materials science
homologous temperatures, i.e. when the material is experiencing creep conditions. Moving a dislocation with an associated Cottrell atmosphere introduces viscous
Cottrell_atmosphere
Material deformation mechanism
creep. Thus, this will lead to about an order magnitude higher strain rate than diffusional creep. Grain boundary sliding accommodated by dislocation
Grain_boundary_sliding
Test procedure to determine mechanical properties of a specimen
Creep is generally aided by diffusion and dislocation movement. While there are many ways to test creep, tensile testing is useful for materials such
Tensile_testing
Nickel-based superalloy
reports that the stress during creep accelerates the nucleation of these precipitates due to the excess dislocations and vacancies from tensile deformation
Inconel_625
American geophysicist
9417825H. doi:10.1029/JB094iB12p17825. Hirth, Greg; Tullis, Jan (1992). "Dislocation creep regimes in quartz aggregates". Journal of Structural Geology. 14 (2):
Greg_Hirth
Structural discontinuity surface in the Earth's crust and upper mantle
grain scale) have to be taken into account: diffusion creep (various types). dislocation creep (various types). dynamic recrystallization pressure solution
Shear_zone
Nuclear power plant component
elevated temperatures, because diffusion and dislocation motion occur more rapidly. Irradiation can cause creep due to the interaction between stress and
Reactor_pressure_vessel
Zircaloy family
steady-state creep, diffusion or dislocation mechanisms can dominate. Deformation maps can visually display the dominating creep mechanisms with respect to
Zirconium_alloys
Marine geologist
theories that olivine deforms via dislocation creep at depths above 250 km in the upper mantle, and via diffusion creep at deeper depths. This was believed
Andréa_Tommasi
Interface between crystallites in a polycrystalline material
important to many of the mechanisms of creep. On the other hand, grain boundaries disrupt the motion of dislocations through a material, so reducing crystallite
Grain_boundary
Injury of the acetabular labrum
acetabular labrum resulting from a number of causes including running, hip dislocation, and deterioration with ageing. Most are thought to result from a gradual
Acetabular_labrum_tear
Behavior in continuum mechanics
In continuum mechanics, ratcheting, or ratchetting, also known as cyclic creep, is a behavior in which plastic deformation accumulates due to cyclic mechanical
Ratcheting
Theory in continuum mechanics
permanent deformations after the application of loads but continue to undergo a creep flow as a function of time under the influence of the applied load. The
Viscoplasticity
Process of crystal regrowth under conditions of stress and high temperature
stress reduction by migration of dislocations in the crystal lattice, known as dislocation creep. These dislocations concentrate into walls, forming new
Dynamic quartz recrystallization
Dynamic_quartz_recrystallization
crystal-plastic deformation include pressure solution, dislocation creep, and diffusion creep. In addition to rocks, biological materials such as wood
Ductility_(Earth_science)
Surgery replacing hip joint with prosthetic implant
after the operation. Dislocation (the ball coming out of the socket) is one of the most common complications. Hip prosthesis dislocation mostly occurs in
Hip_replacement
grains are sufficiently small, which converts the creep mechanism from dislocation creep to diffusion creep, thus the grains start to grow. Therefore, the
Paleostress_inversion
Effects of ionizing radiation
This acts to trap the swelling that occurs as a result of the creep and dislocation motion. They also act to help prevent diffusion, which restricts
Radiation_damage
Type of alloying which improves strength of pure metals
alloying element makes plastic deformation more difficult by impeding dislocation motion through stress fields. In contrast, alloying beyond the solubility
Solid_solution_strengthening
conditions of interest. In the power-law creep regime, global deformation is controlled by glide and climb of dislocations. If internal voids are present within
Damage_mechanics
Indian materials scientist (born 1958)
Chokshi, A. H. (2007). "Grain boundary sliding during diffusion and dislocation creep in a Mg-0.7 Pct Al alloy". Metallurgical and Materials Transactions
Atul_Chokshi
French mineralogist (born 1961)
433, 731–733. 2004 - P. Cordier, T. Ungár, L. Zsoldos & G. Tichy, Dislocation creep in MgSiO3 Perovskite at conditions of the Earth's uppermost lower
Patrick Cordier (mineralogist)
Patrick_Cordier_(mineralogist)
mechanistic creep process and the alloy’s core–shell-type structures. The scientists determined that the copper alloy creep occurred in dislocation climb areas
Microstructurally stable nanocrystalline alloys
Microstructurally_stable_nanocrystalline_alloys
Jerky flow of a material undergoing plastic deformation
drag creep. Adding solute atoms to a pure crystal introduces a size misfit into the system. This size misfit leads to restriction of dislocation motion
Portevin–Le_Chatelier_effect
Type of continuous-flow turbine engine
species (typically vacancies) within the alloy and reducing dislocation and vacancy creep. It has been found that a coating of 1–200 μm can decrease blade
Gas-turbine_engine
Disruption of the periodicity of a crystal lattice
the edge dislocation and the screw dislocation. "Mixed" dislocations, combining aspects of both types, are also common. Edge dislocations are caused
Crystallographic_defect
Electron microscopy technique
Specifically, the technique is mainly used to study crystal defects such as dislocations, stacking faults, and interfaces in crystalline materials. WBDF is a
Weak-beam dark-field microscopy
Weak-beam_dark-field_microscopy
Nickel-based superalloy
corrosion, and oxidation. IN718 is especially designed for fatigue and creep resistance at temperatures up to 700 °C.The oxidation and corrosion resistance
Inconel_718
One of the five families of stainless steel
stress, austenitic stainless steels are subject to creep, or slow deformation over time as dislocations move through the crystal structure. The deformation
Austenitic_stainless_steel
Compounds of iron and aluminium
alloy, FeAl must be treated to increase its creep resistance. The two most common methods to increase the creep resistance of FeAl are solid solution strengthening
Iron_aluminide
Aerofoil; individual component of a turbine disc
phase, dislocation removal, and precipitates, the creation of dislocations at phase interfaces to relieve stress, and the removal of dislocations via thermally
Turbine_blade
dislocation motion, but the degree of translation varies. In stacking faults, the region of stacking mismatch is bounded by two partial dislocations,
Anti-phase_domain
Small crystal which forms under certain conditions
this plane). Grain boundaries disrupt the motion of dislocations through a material. Dislocation propagation is impeded because of the stress field of
Crystallite
Deformation mechanism in crystallines
dislocation simulation, discrete dislocation dynamics, dislocation dynamics, grain boundary, dislocation cell, cross slip, creep, deformation, strain hardening
Slip_bands_in_metals
plastic deformation caused to the material is known as creep. At high temperatures, the strain due to creep is quite appreciable. Density: Mass per unit volume
List_of_materials_properties
Alloy
deformation of Nb alloys is dominated by creep deformation. Nb-based alloys are a class 1 solid solution material. Class 1 creep is denoted by a slow initial strain
Niobium_alloy
Degradation of solder due to deformation under cyclic loading
causes the solder joints to experience non-recoverable deformation via creep and plasticity that accumulates and leads to degradation and eventual fracture
Solder_fatigue
South African solid-state physicist
existence and magnitude of diffusional creep and improved Rudolf Peierls' estimate of the stress required to move a dislocation through a perfect lattice named
Frank_Nabarro
Ionizing radiation that presents as free neutrons
irradiation hardening, embrittlement, creep, and environmentally-assisted cracking. The defect clusters, dislocation loops, voids, bubbles, and precipitates
Neutron_radiation
Type of polycrystalline material
of dislocations. Yielding occurs when the stress due to dislocation pileup at a grain boundary becomes sufficient to activate slip of dislocations in
Nanocrystalline_material
American materials scientist
the high-temperature creep of crystalline solids, and dislocation theory applied to these phenomena. We are developing dislocation-based solutions of the
Johannes_Weertman
Ordered arrangement of atoms, ions, or molecules in a crystalline material
Plastic deformation: Dislocation glide occurs preferentially parallel to higher density planes. The perturbation carried by the dislocation (Burgers vector)
Crystal_structure
Study of fracture surface of ploymers
microscopic imperfections found in the material. These defects namely dislocations, crystalline boundaries, amorphous interlayers and block structure can
Fracture_in_polymers
this decrease in yield strength is due to the thermal activation of dislocation motion, resulting in easier plastic deformation at higher temperatures
Yield_strength_anomaly
Battery with solid electrodes and a solid electrolyte
melting point that dislocations in the metal can climb out of their glide plane to avoid obstacles. The creep stress under power-law creep is given by: σ
Solid-state_battery
Seismologist
earthquakes Meltzer, Anne; Christensen, Nikolas (1 February 1992). "Dislocation creep regimes in quartz aggregates". Journal of Structural Geology. 14 (2):
Anne_Meltzer
Mixture of magnesium with other metals
magnesium shows similar creep life as pure aluminium, but magnesium alloys show decreased creep life compared to aluminium alloys. Creep in magnesium alloys
Magnesium_alloy
Phenomenon of deformation due to structural stress
elastic limit The lowest stress at which dislocations move. This definition is rarely used since dislocations move at very low stresses, and detecting
Yield_(engineering)
strengthens the aluminum matrix by applying elastic strain fields that inhibit dislocation movement (i.e., plastic deformation). An added benefit of scandium additions
Aluminium–scandium_alloys
Reduction in ductility of a metal exposed to hydrogen
Hydrogen-decreased dislocation emission: Molecular dynamics simulations suggest a ductile-to-brittle transition caused by the suppression of dislocation emission
Hydrogen_embrittlement
Mixture with a lower melting point than its constituents
dominated by dislocation movement, the strengthening from load transfer and secondary phase spacing remain as they continue to resist dislocation motion. At
Eutectic_system
Loss of ductility of a material, making it brittle
crack opening). High resistance to dislocation movement. There should be a small amount of viscous drag of dislocation to ensure opening of crack. All metals
Embrittlement
Split of materials or structures under stress
displacement develops tangentially, it is called a shear crack, slip band, or dislocation. Brittle fractures occur without any apparent deformation before fracture
Fracture
Chemical compound
increase the creep resistance. This creep resistance is attributed to the formation of inhomogeneous precipitate Cr4.6MoNi2.1, which pins dislocations and prevents
Nickel_aluminide
Subjecting workpieces to cold temperatures
including less electrical resistance, reduced coefficient of friction, less creep and walk, improved flatness, and easier machining. Cryogenic tempering is
Cryogenic_treatment
1946 book by Ruth Benedict
of a class for that of the entire culture, "a state of acute social dislocation for a normal condition, and an extraordinary moment in a nation's history
The Chrysanthemum and the Sword
The_Chrysanthemum_and_the_Sword
Type of material
vacancies, line and screw dislocations, stacking faults and twins in both crystalline and non-crystalline metals. Internal slip, creep, and metal fatigue may
Metal
City in California, United States
still habitable as the owners have reinforced them to withstand the dislocation of their foundations. Although there was extensive damage in the town
Hollister,_California
Mountain pass across the Julian Alps in Slovenia
In the western part of the Vršič Pass, there is evidence of a main dislocation. The relief has been significantly eroded. The Vršič pass has a width
Vršič_Pass
3D printing technique
and creep tests of 316L steel performed at 600 °C and 650 °C concluded that the SLM steel reached the minimum creep rate at significantly lower creep strains
Selective_laser_melting
Compounds of carbides and nitrides
plane a-dislocations and dislocation cross-slips were recently reported in MAX phase deformed at high temperature and Frank partial c-dislocations induced
MAX_phases
Smoothly polished surface in geology
have irregular grain boundaries and few crystal lattice defects (termed dislocations). Slickensides have conspicuous shapes that can be used to determine
Slickenside
British scientist and academic
high-temperature creep of metals and especially on the role of grain boundary sliding and the interactions between flow by dislocation climb and dislocation glide
Terence_G._Langdon
Material with a continuous, unbroken crystal lattice
impurities, inhomogeneous strain and crystallographic defects such as dislocations, perfect single crystals of meaningful size are exceedingly rare in nature
Single_crystal
Metallic material
room-temperature ductility. Creeps via viscous glide of dislocations by pipe diffusion. More creep-resistant than SnAg3.5. Antimony can be toxic. Used for
Solder_alloys
Hungarian-British physicist (1902–1989)
Hungarian-British physicist and metallurgist. He was key in introducing crystal dislocation into physics and understanding of how materials plastically deform under
Egon_Orowan
Place in Agadez Region, Niger
Niger's uranium "boom" has never recovered its 1980s level, causing dislocation and suffering for the tens of thousands of Nigeriens who flocked to the
Arlit
Method of measuring the amount of energy absorbed by a material during fracture
etc) generally work by changing the material in a way that resists dislocation motion. But this also shrinks the plastic zone at the crack tip during
Charpy_impact_test
typically associated with a dislocation glide mechanism, and an activation energy of 1.02 eV. n is the stress exponent, Q is the creep activation energy, and
Solid_acid_fuel_cell
2000 studio album by Radiohead
that it "foresaw a darker 21st century, one marked by fear, loneliness, dislocation, and technological advancements that only divide us further ... And 25
Kid_A
How nuclear fuel behaves during a reactor accident
predict. The thermal creep behaviour of cladding is also sensitive to dissolved hydrogen: hydrogen in solid solution accelerates creep rates, while precipitated
Behavior of nuclear fuel during a reactor accident
Behavior_of_nuclear_fuel_during_a_reactor_accident
Alloys with high proportions of several metals
of dislocations. Generally speaking, increased movement of dislocations throughout the lattice leads to deformation, while inhibition of dislocation motion
High-entropy_alloy
Partial alignment of polymer molecular chains
the deformation of crystalline regions of the material via dislocation motion. Dislocations result in coarse or fine slips in the polymer and lead to crystalline
Crystallization_of_polymers
1666 conflagration in England
political, economic, and cultural impact. The fire "caused the largest dislocation of London's residential structure in its history until the Blitz". Areas
Great_Fire_of_London
Far-right authoritarian political ideology
authoritarianism, along with early communism, when a population has undergone huge dislocations or they perceive that there's been changes in society that are very rapid
Fascism
Viral disease caused by the varicella zoster virus
herpesviruses derives from the Greek word έρπης herpēs, from έρπω herpein ("to creep"), referring to the latent, recurring infections typical of this group of
Shingles
German Romantic landscape painter (1774–1840)
focus has shifted away from the broad landscape and toward the sense of dislocation between the two melancholy figures in the foreground. Friedrich's modern
Caspar_David_Friedrich
Global inflation following the COVID-19 pandemic
been attributed to various causes, including pandemic-related economic dislocation, supply chain disruptions, the fiscal and monetary stimulus provided
2021–2023_inflation_surge
Chemical element with atomic number 21 (Sc)
strengthens the aluminum matrix by applying elastic strain fields that inhibit dislocation movement (i.e., plastic deformation). Al3Sc has an equilibrium L12 superlattice
Scandium
Force resisting sliding motion
ISSN 0038-5670. Kaganov, Moisei I; Kravchenko, Ya V; Natsik, V D (1974-06-30). "Dislocation dragging by electrons in metals". Soviet Physics Uspekhi. 16 (6): 878–891
Friction
DISLOCATION CREEP
DISLOCATION CREEP
Girl/Female
Tamil
Golden creeper
Girl/Female
Tamil
A creeper with beautiful flowers, Springtime
Girl/Female
Tamil
Hemalatha | ஹேமலதா
Golden creeper, Golden wine
Hemalatha | ஹேமலதா
Girl/Female
Tamil
Madhumalathi | மதà¯à®®à®¾à®²à®¤à¯€
Name of a Raga, A flowering creeper
Madhumalathi | மதà¯à®®à®¾à®²à®¤à¯€
Girl/Female
Tamil
Madhulata | மதà¯à®²à®¤à®¾
Sweet creeper or Lovely creeper
Madhulata | மதà¯à®²à®¤à®¾
Girl/Female
Tamil
Charulata | சாரà¯à®²à®¤à®¾
Beautiful creeper
Charulata | சாரà¯à®²à®¤à®¾
Girl/Female
Tamil
Sacred wood apple tree, Time, Creeper
Girl/Female
Tamil
Charulatha | சாரà¯à®²à®¤à®¾
Beautiful creeper
Charulatha | சாரà¯à®²à®¤à®¾
Girl/Female
Tamil
A creeper with fragrant flowers
Girl/Female
Tamil
Golden creeper
Girl/Female
Tamil
Madhulatha | மதà¯à®²à®¤à®¾
Sweet creeper or Lovely creeper
Madhulatha | மதà¯à®²à®¤à®¾
Girl/Female
Tamil
A creeper, Sandalwood
Girl/Female
Tamil
A creeper with fragrant flowers
Girl/Female
Tamil
Creeper of hope
Girl/Female
Tamil
Sacred wood apple tree, Time, Creeper
Girl/Female
Tamil
Golden creeper, Golden wine
Girl/Female
Tamil
Madhumalati | மதà¯à®®à®¾à®²à®¤à¯€
Name of a Raga, A flowering creeper
Madhumalati | மதà¯à®®à®¾à®²à®¤à¯€
Girl/Female
Tamil
A creeper with beautiful flowers, Springtime
Girl/Female
Tamil
A creeper with flowers
Girl/Female
Tamil
Madhavilata | மாதவிலதா
A flowering creeper
DISLOCATION CREEP
DISLOCATION CREEP
Girl/Female
Indian, Kashmiri
Candle
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Soft; Meritorious
Boy/Male
Australian, French, German, Italian, Portuguese
Ruler over Heroes
Boy/Male
Indian, Punjabi, Sikh
Love for Prayer
Girl/Female
Indian
Goddess of smallpox.
Boy/Male
Tamil
Rajinder | ராஜிஂதர
Spontaneous
Male
Hebrew
(×וּר) Hebrew name UWR means "flame or light of fire," also possibly "revelation." In the bible, this is the native place of Abraham, the city of the Chaldeans, and a center of moon worship. The Persian form of Uwr/Ur is Urim, also meaning "fire, flame." According to the Book of Jubilees, the city of Uwr/Ur was named by Ur, son of Kesed.
Female
English
Feminine form of English Eric, ERICA means "ever-ruler."
Girl/Female
Arabic, Muslim
Pleasant; Gentle
Boy/Male
English American Italian Spanish
Sage; wise; elvin.
DISLOCATION CREEP
DISLOCATION CREEP
DISLOCATION CREEP
DISLOCATION CREEP
DISLOCATION CREEP
n.
Fractures or dislocations caused by settlement.
n.
A dislocation of a lead, destroying continuity.
v. t.
A breaking off and dislocation of a seam; a fault.
n.
A small dislocation of a bed or vein.
n.
The displacement of parts of rocks or portions of strata from the situation which they originally occupied. Slips, faults, and the like, are dislocations.
n.
The act of dissociating or disuniting; a state of separation; disunion.
n.
A machine formerly employed for reducing dislocations of the humerus.
n.
Luxation; the dislocation of a joint.
n.
A small dislocation in beds of rock along a line of fissure.
p. pr. & vb. n.
of Dislocate
n.
A dislocation in a stratum; a fault.
n.
The process by which a compound body breaks up into simpler constituents; -- said particularly of the action of heat on gaseous or volatile substances; as, the dissociation of the sulphur molecules; the dissociation of ammonium chloride into hydrochloric acid and ammonia.
n.
The act of dislocating, or putting out of joint; also, the condition of being thus displaced.
n.
Converting forest land into cleared or arable land; removal of a forest.
n.
An incomplete or partial dislocation.
n.
A dislocation of the strata of the vein.
n.
The act of luxating, or the state of being luxated; a dislocation.
a.
Tending or leading to dissociation.
n.
The act of displacing, or the state of being displaced.
n.
Dislocation; luxation.