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Evolution of dislocation density in Type

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Time evolution of dislocation formation in ion implanted

Time evolution of dislocation formation in ion implanted silicon J.R.Liefting type (100) Si.The number of displaced atoms in the as- the final dislocation density and position [6].However,it is not known if the interaction takes place before,during,or after dislocation formation.Three-Dimensional Continuum Dislocation Dynamics Jan 29,2016 Evolution of dislocation density in Type#0183;CDD captures the kinematics of moving curved dislocations in flux-type evolution equations for dislocation density variables,coupled to the stress field via average dislocation velocity-laws based on the Peach-Koehler force.Three-Dimensional Continuum Dislocation Dynamics CDD captures the kinematics of moving curved dislocations in flux-type evolution equations for dislocation density variables,coupled to the stress field via average dislocation velocity-laws based on the Peach-Koehler force.

The evolution of internal stress and dislocation during

/ The evolution of internal stress and dislocation during tensile deformation in a 9Cr ferritic while the stronger screw type of dislocation structure at 600 Evolution of dislocation density in Type#176;C may be explained by the activated cross slip of screw segments., The dislocation density decreased with increasing of temperature due to the greater mobility of dislocation at Structural evolution of dislocation half-loops in Since the dislocation half loops are k100l-type edge dis-locations,the growth and evolution of these dislocations to form a mist dislocation array at the lm/substrate interface proceeds through climb,which involves mass transportation about the dislocation cores.Since each half loop has twoStatistical mechanics treatment of the evolution of A statistical mechanics framework for the evolution of the distribution of dislocations in a single crystal is established.Dislocations on various slip systems are represented by a set of phase-space distributions each of which depends on an angular phase space coordinate that represents the line sense of dislocations.The invariance of the integral of the dislocation density tensor over the

Related searches for Evolution of dislocation density in Type

dislocation density definitiondislocation density unitsdislocation density formulamobile dislocation densitytypes of dislocations in materialsdislocation density calculationtypes of knee dislocationdislocation density xrdPrevious123456NextRelated searches for Evolution of dislocation density in Typedislocation density definitiondislocation density unitsdislocation density formulamobile dislocation densitytypes of dislocations in materialsdislocation density calculationtypes of knee dislocationdislocation density xrd12345NextEect of dislocation density evolution on the the dislocation density evolution is considered.Voyiadjis and Abed incorporated the production rate of dislocation density in modeling the plastic ow stress for both bcc and fcc metals using 302 G.Z.Voyiadjis,F.H.AbedOrigin of micrometer-scale dislocation motion during Fig.2 Dislocation motion during H desorption in Fe-Mnbased alloy captured by ECCI.(A) A planar dislocation pileup at a grain boundary (GB) at different stages of H desorption.(B) Dislocation configurations at t = 2 and 2.5 hours are shown schematically.Note the ~1.5-m distance that dislocations b and c glide.(C) Relative positions of dislocations with respect to the GB are plotted

Orientation dependence of dislocation structure evolution

Excess dislocation density by orientation,{0 1 1} and {1 1 1} show an Table 1,which was calculated using in-house software from increase in excess dislocation density faster than the {0 0 1} grains do for true lattice curvature data,collected using EBSD.With respect to strain steps of 0.05.On the evolution of crystallographic dislocation density gence of dislocation ux and to geometric reactions that are accurate to the discrete dislocation level.The dipolar portion of the evolution equations includes the genera-tion of dislocation density,based on the principle of dislocation line continuity,and the annihilation of dislocation density,based on the frequency of dipole encounters.Microstructure evolution influenced by dislocationIn Section 2,the dislocation density evolution laws and the components of the dislocation reaction-diusion system are discussed.The gradient terms in the dislocation reactions are also introduced in this section.In Section 3,it is shown that the proposed model of dislocation density evolution

Microstructure and Mechanical Properties Evolution of the

Microstructure evolution was mostly associated with either planar dislocation glide at relatively low deformation during rolling (up to 20%) or deformation twinning and shear banding at higher strain.After 80% reduction,a heavily deformed twinned/subgrained structure was observed.Machine Learning-Based Classification of Dislocation Jun 18,2019 Evolution of dislocation density in Type#0183;denotes the line direction density.If computed separately for each slip system in a coordinate system that is based on the Burgers vector of that slip system,it can be interpreted as the density of edge- and screw-type dislocation character.Evolution of threading dislocation density in PVT SiC For bulk growth from the vapor of SiC and AlN,module Threading Dislocations (TD) can be applied to analyse evolution of threading dislocation density.The implemented energy-based approach operates with the data on the crystal shape evolution computed with Virtual Reactor.

Evolution of intragranular stresses and dislocation

Aug 01,2015 Evolution of dislocation density in Type#0183;Comparison of total dislocation density and map averaged GND density shown in Fig.7 reveals that variations in the number of cycles in the total dislocation density follow a similar trend but at higher density than variations in GND density calculated for a 0.5 m patch length.For the cyclically deformed samples the GND density contributes Evolution of dislocation density,size of subgrains andsubgrains,dislocation density and MX-type precipitates in the Grade 91 steel after more than 105h of creep or thermal aging exposure at 600 C.P91steel belongs to the family of9-12%Cr tempered martensitic steels and similar evolutionof subgrains,dislocation density are expected to happen during long-term creep exposure.The purpose of this Evolution of dislocation density in a hot rolled Zr-2.5Nb Nov 01,2017 Evolution of dislocation density in Type#0183;The evolution of dislocation density and microstructure of a hot rolled Zr-2.5Nb alloy under compressive plastic strain,at room temperature,was analysed using neutron diffraction and transmission electron microscopy (TEM).The dislocation densities of type Evolution of dislocation density in Typelt;a Evolution of dislocation density in Typegt;, Evolution of dislocation density in Typelt;c + a Evolution of dislocation density in Typegt; and Evolution of dislocation density in Typelt;c Evolution of dislocation density in Typegt; dislocations at different plastic strains in the elastic-plastic transition regime and plastic regime have

Evolution of dislocation density in Type-316L austenitic

Abstract.Changes in dislocation density were examined in stainless steels of Type 316L on irradiation by 500-keV Ni/sup +/ ions.Over a wide temperature range (400 to 700 deg C) a high dislocation density was observed.Evolution of dislocation density during compressionEvolution of dislocation density during compression of a Mg-Zn-Y alloy with long period stacking ordered structure K.M Evolution of dislocation density in Type#225;thisa,G.Farkasa,G.Garc Evolution of dislocation density in Type#233;sb,J.Gubiczac, a Department of Physics of Materials,Faculty of Mathematics and Physics,Charles University,Ke Karlovu 5,121 16 Praha 2,Czech Republic bDepartment of Physical Metallurgy,CENIM-CSIC,Avenida Gregorio del Amo 8,E-28040 Evolution of dislocation density distributions in copper The evolution of dislocation storage in deformed copper was studied with cross-correlation-based high-resolution electron backscatter diffraction.Maps of 500 mu m x 500 mu m areas with 0.5 mu m

Evolution of dislocation density and character in hot

The dislocation density of warm-rolled CP-Ti at 40% reduction (Dragomir et al.,2005) was = 4E14 m ( Figure A20),where the Burgers vector population of type Evolution of dislocation density in Typelt;a Evolution of dislocation density in Typegt; was the highest,and the Evolution of dislocation and twin densities in a Mg alloy Dec 01,2020 Evolution of dislocation density in Type#0183;Lee et al.presented that the total dislocation density in AZ80 alloy increases as strain rate increases from 800 to 2200 s 1 and emphasized the strengthening effect of dislocations.It appears that the influence of strain rate on dislocation density in Mg alloys has only been studied by using transmission electron microscopy (TEM).Effects of Dislocation Density Evolution on Mechanical In this study,the dislocation density-related microstructure evolution process and mechanical behavior of OFHC (Oxygen-free high-conductivity) copper in high-speed machining with speeds ranging from 750 m/min to 3000 m/min are investigated.

Effects of Dislocation Density Evolution on Mechanical

As microstructure evolution is induced by dislocation density evolution,the dislocation cell sizes are shown in Figure 6b,f,which could also be referred to as sub-grain sizes.The distribution of grain sizes from the experimental results are shown in Figure 6 c,g,Effects of Dislocation Density Evolution on Mechanical As microstructure evolution is induced by dislocation density evolution,the dislocation cell sizes are shown in Figure 6 b,f,which could also be referred to as sub-grain sizes.The distribution of grain sizes from the experimental results are shown in Figure 6 c,g,and the actual microstructures are shown in Figure 6 d,h.Figure 6.Effect of strain rate and dislocation density on the The effect of the initial dislocation density,which was imparted by deforming the material to different amounts of pre-strain,was also studied,and it was shown that twinning is suppressed after a given amount of pre-strain,even as the global stress continues to increase.

Effect of strain rate and dislocation density on the

Apr 28,2016 Evolution of dislocation density in Type#0183;The effect of the initial dislocation density,which was imparted by deforming the material to different amounts of pre-strain,was also studied,and it was shown that twinning is suppressed after a given amount of pre-strain,even as the global stress continues to increase.Dislocation-type evolution in quasi-staticallyFull length article Dislocation-type evolution in quasi-statically compressed polycrystalline nickel Chaoyi Zhu a,Tyler Harrington a,George T.Gray III b,Kenneth S.Vecchio a,* a Department of Dislocation-density based description of thederive the evolution of the mobile density in the system as the change of the dipole density.For a monotonously decreasing stress level,this yields an increasing amount of immobile dislocation dipole density in the system or rather the averaging element.For an increase of the stress level,dipoles can be re-mobilized again.

Dislocation evolution during plastic deformation

crete dislocation dynamics to establish a continuum-based model for the evolution of the dislocation structure in polycrystalline thin lms.The Taylor equation is evaluated and expressions are devel-oped for the density of active dislocation sources,as well as dislocation nucleation and annihilation rates.Dislocation density evolution in the process of high @article{osti_22689722,title = {Dislocation density evolution in the process of high-temperature treatment and creep of EK-181 steel},author = {Vershinina,Tatyana and Leont'eva-Smirnova,Maria},abstractNote = {X-ray diffraction has been used to study the dislocation structure in ferrite-martensite high-chromium steel EK-181 in the states after heat treatment and high-temperature creep.Dislocation Structure Evolution during PlasticDislocation Structure Evolution establishing a relationship between dislocation density and stress (Goryachev,1984).In Taylor's duplication theory of strengthening,one proceeds from the correspond changes in the dislocation structure type.Fifure 2.Diagram demonstrating the structural sensitivity of the strain hardening curve for

Cited by 9Publish Year 2017Author F.Long,L.Balogh,M.R.DaymondA dislocation density-based single crystal constitutive

similar to standard corresponding texture-type equations,except that the dislocation density for each slip system and its evolution is used explicitly rather than implicitly via slip system strength and its evolution with total slip (Ortiz and Popov,1982; Brown et al.,1989; Kalidindi et al.,1992; Kuchnicki et al.,2006; Wang et al.,2007).Cited by 7Publish Year 2020Author Huihui Zhi,Cheng Zhang,Stoichko Antonov,Haiyang Yu,Tao Guo,Yanjing SuThe evolution of dislocation density during heat treatment Sep 15,2003 Evolution of dislocation density in Type#0183;The evolution of dislocation density in two tempered martensite ferritic steels (a 12% and a 9% chromium steel,X20 and P91) during heat treatment and creep is analyzed using transmission electron microscopy (TEM) and X-ray diffraction (XRD); both methods yield results which are in good agreement when rationalizing the XRD-data based on densities of free dislocations.Cited by 52Publish Year 2015Author Jun Jiang,Jun Jiang,T.Benjamin Britton,Angus J.WilkinsonEvolution of dislocation density and character in hot X-ray Peak Profile Analysis was employed to determine the evolution dislocation density and dislocations type in hot rolled commercially pure titanium specimens.It was found that hai dislocation type is dominating the deformation mechanism at all rolling reduction levels studied here.

Cited by 4Publish Year 2016Author Alireza Ebrahimi,Thomas Hochrainer(PDF) Grain growth and dislocation density evolution in a

Grain growth and dislocation density evolution in a nanocrystalline NiFe alloy induced by high-pressure torsion.Download. It should be noted also that a lattice dislocation in an fcc metal is normally dissociated into two 1/6 Evolution of dislocation density in Typelt;1 1 2 Evolution of dislocation density in Typegt; type partial dislocations.For example,a lattice dislocation with the Burgers vector of 1 2 Evolution of dislocation density in Type#189;011 on Cited by 419Publish Year 2003Author J.Peika,R.Kuel,A.Dronhofer,G.EggelerEect of dislocation density evolution on the the plastic strain evolution of dislocation density nor the rate multiplication of the dislocation density evolution is considered.Voyiadjis and Abed [55] incorporated the production rate of dislocation density in modeling the plastic ow stress for both bcc and fcc metals using.Cited by 3Publish Year 2019Author Hongguang Liu,Jun Zhang,Xiang Xu,Yutong Qi,Zhechao Liu,Wanhua ZhaoEvolution of dislocation density,size of subgrains and MX Evolution of dislocation density,size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600 Evolution of dislocation density in Type#176;C for more than 100,000 h June 2010 Materials Science

Cited by 3Publish Year 2019Author Hongguang Liu,Jun Zhang,Xiang Xu,Yutong Qi,Zhechao Liu,Wanhua ZhaoEvolution of dislocation density and character in hot

The dislocation density of warm-rolled CP-Ti at 40% reduction (Dragomir et al.,2005) was = 4E14 m ( Figure A20),where the Burgers vector population of type Evolution of dislocation density in Typelt;a Evolution of dislocation density in Typegt; was the highest,and the Cited by 2Publish Year 2016Author Georgii I.Raab,Yurii M.Podrezov,Mykola I.Danylenko,Katerina M.Borysovska,Gennady N.Aleshin,Evolution of microstructures,dislocation density and Abstract In this paper,the role of solute carbon on the strengthening and work hardening behavior of lath martensite was studied by analyzing the microstructures and dislocation density in the undeformed and deformed conditions.An increase in carbon content from 0.18% to 0.30% decreases the martensite start (Ms) temperature,leading to refinement of both the block and lath widths.Cited by 1Publish Year 2020Author M.Wang,X.Y.Xu,H.Y.Wang,L.H.He,M.X.HuangEvolution of dislocation density,size of subgrains and MX Jun 25,2010 Evolution of dislocation density in Type#0183;Evolution of dislocation density,size of subgrains and MX-type precipitates in a P91 steel during creep and during thermal ageing at 600 Evolution of dislocation density in Type#176; C for more than 100,000 h 1.Introduction 912% chromium heat resistant steels are used for high temperature applications,in

Cited by 192Publish Year 2010Author Clara Gabriela Panait,Clara Gabriela Panait,Anna Zieliska-Lipiec,Tomasz Koziel,Aleksandra CzyrsInvestigations of dislocation-type evolution and strain

Aug 15,2020 Evolution of dislocation density in Type#0183;Abstract In this study,for the first time,the evolution of geometrically necessary dislocation (GND) and statistically stored dislocation (SSD) densities,as well as their roles in strain hardening during mechanical twinning,was experimentally investigated in a tensile-deformed Fe-22Mn-0.6C twinning-induced plasticity (TWIP) steel.Analyses of Dislocation Effects on Plastic Deformation The evolution equations based on the dislocation density are connected to polycrystals [ 166,167,168 ].The interaction of the dislocation density in two directions leads to the formation or destruction of the joints which is because of the relation of the strain hardening orientation.A statistical analysis of the elastic distortion and @article{osti_1347301,title = {A statistical analysis of the elastic distortion and dislocation density fields in deformed crystals},author = {Mohamed,Mamdouh S.and Larson,Bennett C.and Tischler,Jonathan Z.and El-Azab,Anter},abstractNote = {The statistical properties of the elastic distortion fields of dislocations in deforming crystals are investigated using the method of discrete

(PDF) Growth strategy for controlling dislocation

Evolution of crystal shape type A substrates Optical images of the crystal grown onto a type A substrate with where d is the enlargement of the central square,Dnorm is the normal off-angles of 20 Evolution of dislocation density in Type#176; are presented in Fig.2 after three successive growth growth of the top (001) sector which can be directly measured using runs corresponding to (PDF) Evolution of Dislocation Density During Tensile Dislocation densities of the deformed specimens were successfully estimated from x-ray diffraction prole analysis using the modied Williamson-Hall equation.The results indicate that other than(IUCr) Evolution of dislocation microstructure in The dislocation density goes down by about a factor of three after 200 h of heat treatment at 533 Evolution of dislocation density in Type#177; 10 K.In agreement with this,the Vickers hardness (Hv) of the material also reduced after the heat treatment. the majority of the prismatic loops are a type.An important feature of the evolution of the prismatic loops formed during

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