EBSD: Current state, prospects and comparison with XRD
... The great majority of natural as well as technologically used solids are not amorphous, but have a polycrystalline structure that is characterized by size, shape and arrangement of the constituting crystals and phases. The distribution of preferred grain orientations, or in short (crystallographic) ...
... The great majority of natural as well as technologically used solids are not amorphous, but have a polycrystalline structure that is characterized by size, shape and arrangement of the constituting crystals and phases. The distribution of preferred grain orientations, or in short (crystallographic) ...
Crystalline Solids: Diffraction
... nineteenth century, the systematic study of the external shapes of such natural crystals led scientists to conclude that this regularity of the outer faces must be due to structural regularities on the microscopic scale. The molecules or atoms had to be assembled in a periodic manner to make a cryst ...
... nineteenth century, the systematic study of the external shapes of such natural crystals led scientists to conclude that this regularity of the outer faces must be due to structural regularities on the microscopic scale. The molecules or atoms had to be assembled in a periodic manner to make a cryst ...
Introduction to Materials
... produced by the gliding of atomic planes. It involves the presence of crystal defects such as dislocations. These dislocations must not only be able to form but also move easily under the effect of a stress. In a metallic material, the absence of preferential direction of the bonds between atoms fac ...
... produced by the gliding of atomic planes. It involves the presence of crystal defects such as dislocations. These dislocations must not only be able to form but also move easily under the effect of a stress. In a metallic material, the absence of preferential direction of the bonds between atoms fac ...
A continuum elastic–plastic model for woven-fabric/polymer
... Due to the large amount of anisotropy and heterogeneity of woven fabric composites on a mesoscopic scale and the tremendously varying modes of microdamage which depend on the applied stress state (either uniaxial or biaxial, tension or compression), the macroscopic non-linear behavior is strongly de ...
... Due to the large amount of anisotropy and heterogeneity of woven fabric composites on a mesoscopic scale and the tremendously varying modes of microdamage which depend on the applied stress state (either uniaxial or biaxial, tension or compression), the macroscopic non-linear behavior is strongly de ...
on plastic void growth in strong ductile materials
... according to Eq. (4.14). The results are for Y /E = 1/500, and for three values of the hardening modulus k/E = 1/100, 1/50, and 1/25 (from lower to upper curve). ...
... according to Eq. (4.14). The results are for Y /E = 1/500, and for three values of the hardening modulus k/E = 1/100, 1/50, and 1/25 (from lower to upper curve). ...
IOSR Journal of Applied Physics (IOSR-JAP)
... where n is the Meyer‟s index or work hardening coefficient and d is the measure of indentation size effect (ISE) and k is the material‟s constant. The simplest way to describe the ISE is Meyer‟s law. For the normal ISE behavior, the exponent n < 1.6. When n > 1.6, there is the reverse ISE behavior. ...
... where n is the Meyer‟s index or work hardening coefficient and d is the measure of indentation size effect (ISE) and k is the material‟s constant. The simplest way to describe the ISE is Meyer‟s law. For the normal ISE behavior, the exponent n < 1.6. When n > 1.6, there is the reverse ISE behavior. ...
An energy-based approach for estimates of the stress-strain
... to be linear elastic and the little plasticity, if present, is believed to be confined at a pretty small region that it can be neglected. By increasing the nominal stress by a factor of kf (or by decreasing the strength) it is possible to obtain the characteristic variable (maximum local stress) at ...
... to be linear elastic and the little plasticity, if present, is believed to be confined at a pretty small region that it can be neglected. By increasing the nominal stress by a factor of kf (or by decreasing the strength) it is possible to obtain the characteristic variable (maximum local stress) at ...
Principal strains, principal directions
... In case the deformations are small and the bady is elastic, then relations (E1) are linear. linear ...
... In case the deformations are small and the bady is elastic, then relations (E1) are linear. linear ...
0131.PDF
... the data of Marsh (6), the shock velocity-particle velocity data was very different, indicating a change in behaviour at ca. 6 GPa. Whilst no definitive explanation was given, it was noted that similar observations were made by Champion (9) who investigated the shock response of polytetrafluroethyle ...
... the data of Marsh (6), the shock velocity-particle velocity data was very different, indicating a change in behaviour at ca. 6 GPa. Whilst no definitive explanation was given, it was noted that similar observations were made by Champion (9) who investigated the shock response of polytetrafluroethyle ...
effect of temperature on the evolution of structure, crystallographic
... Thus, the X-ray diffraction analysis shows that a decrease in the temperature of continuous ECAP contributes to additional microstructure refinement. The experimental complete PFs (0002) for Ti (grade 4) in various investigated states (the intial state, the states after the first, second, fourth and ...
... Thus, the X-ray diffraction analysis shows that a decrease in the temperature of continuous ECAP contributes to additional microstructure refinement. The experimental complete PFs (0002) for Ti (grade 4) in various investigated states (the intial state, the states after the first, second, fourth and ...
Synthesis, Growth and characterization of L-Histidine
... Key words: Single crystal; XRD; microhardness; dielectric constant; thermal studies; NLO ...
... Key words: Single crystal; XRD; microhardness; dielectric constant; thermal studies; NLO ...
DOE Material Science 1
... subjects, which include Mathematics; Classical Physics; Thermodynamics, Heat Transfer, and Fluid Flow; Instrumentation and Control; Electrical Science; Material Science; Mechanical Science; Chemistry; Engineering Symbology, Prints, and Drawings; and Nuclear Physics and Reactor Theory. The handbooks ...
... subjects, which include Mathematics; Classical Physics; Thermodynamics, Heat Transfer, and Fluid Flow; Instrumentation and Control; Electrical Science; Material Science; Mechanical Science; Chemistry; Engineering Symbology, Prints, and Drawings; and Nuclear Physics and Reactor Theory. The handbooks ...
Ab initio modelling of mechanical and elastic properties of solids
... The aim of the thesis is to study mechanical properties of crystalline materials on the basis of density functional theory (DFT) by applying first-principles or ab initio techniques. Mechanical properties of materials are of crucial importance for technological applications. How a material breaks, i ...
... The aim of the thesis is to study mechanical properties of crystalline materials on the basis of density functional theory (DFT) by applying first-principles or ab initio techniques. Mechanical properties of materials are of crucial importance for technological applications. How a material breaks, i ...
9. Short overview of rheology very short for 2 credit course
... Response of Classical Extremes Stain for t>t1 is constant – Strain for t >t2 is 0 ...
... Response of Classical Extremes Stain for t>t1 is constant – Strain for t >t2 is 0 ...
Chapter #3 -- The Structure of Crystalline Solids
... ¾ As we learned in Chapter 2, the atomic bonding in metals is non-directional ⇒ no restriction on numbers or positions of nearest-neighbor atoms ⇒ large number of nearest neighbors and dense atomic packing ¾ Atom (hard sphere) radius, R, defined by ion core ...
... ¾ As we learned in Chapter 2, the atomic bonding in metals is non-directional ⇒ no restriction on numbers or positions of nearest-neighbor atoms ⇒ large number of nearest neighbors and dense atomic packing ¾ Atom (hard sphere) radius, R, defined by ion core ...
ppt
... adjacent low-strain areas (shaded). The process is accompanied by vertical shortening. c. Pressure solution of a quartz crystal in a deformed quartzite (s1 is vertical). Pressure solution results in a serrated solution surface in high-strain areas (small arrows) and precipitation in low-strain areas ...
... adjacent low-strain areas (shaded). The process is accompanied by vertical shortening. c. Pressure solution of a quartz crystal in a deformed quartzite (s1 is vertical). Pressure solution results in a serrated solution surface in high-strain areas (small arrows) and precipitation in low-strain areas ...
PowerPoint Presentation - Chapter 23, Metamorpic Textures
... adjacent low-strain areas (shaded). The process is accompanied by vertical shortening. c. Pressure solution of a quartz crystal in a deformed quartzite (s1 is vertical). Pressure solution results in a serrated solution surface in high-strain areas (small arrows) and precipitation in low-strain areas ...
... adjacent low-strain areas (shaded). The process is accompanied by vertical shortening. c. Pressure solution of a quartz crystal in a deformed quartzite (s1 is vertical). Pressure solution results in a serrated solution surface in high-strain areas (small arrows) and precipitation in low-strain areas ...
Dislocations
... stress at which a crack will propagate and eventually fail The stress at which fracture occurs in a material is termed fracture strength For a brittle elastic solid this strength is estimated to be around E/10, E being the modulus of elasticity This strength is a function of the cohesive forces b ...
... stress at which a crack will propagate and eventually fail The stress at which fracture occurs in a material is termed fracture strength For a brittle elastic solid this strength is estimated to be around E/10, E being the modulus of elasticity This strength is a function of the cohesive forces b ...
Identification and Determination of Crystal Structures and
... as a triple uvw. The coordinates are integers for lattice points in primitive unit cells. They may be fractions when they refer to coordinates between lattice points. The lattice points for the FCC cell are 000, ½½0, 0½½, ½0½. Why are some of the lattice points at non-integer positions? 1.2 Lattice ...
... as a triple uvw. The coordinates are integers for lattice points in primitive unit cells. They may be fractions when they refer to coordinates between lattice points. The lattice points for the FCC cell are 000, ½½0, 0½½, ½0½. Why are some of the lattice points at non-integer positions? 1.2 Lattice ...
Growth and Spectral Studies of Unidirectionally grown L
... experimental samples reported an input pulse of 6.2 mJ, the second harmonic signal (532 nm) of 89.02 mW for KDP and 268.50 mW for LTA. It is thus elucidated that the SHG efficiency of LTA is 3.0 times higher than that of KDP. The suitability of LTA crystal for NLO applications was investigated from ...
... experimental samples reported an input pulse of 6.2 mJ, the second harmonic signal (532 nm) of 89.02 mW for KDP and 268.50 mW for LTA. It is thus elucidated that the SHG efficiency of LTA is 3.0 times higher than that of KDP. The suitability of LTA crystal for NLO applications was investigated from ...
Strain state in silicon structures for microprocessor technology M.
... made to avoid undesired stress. On the other hand, positive effects of strain are employed in CMOS transistor technology. The reason is a significant performance gain achievable by introducing strained films into active transistor regions [1, 2] which will become more important as the long-term scal ...
... made to avoid undesired stress. On the other hand, positive effects of strain are employed in CMOS transistor technology. The reason is a significant performance gain achievable by introducing strained films into active transistor regions [1, 2] which will become more important as the long-term scal ...
(LHS), A Novel Organic NLO Material
... The HR- SEM analysis is very useful to inspect the nature and surface morphology of the grown crystal. Highly transparent region of the crystal was used for the surface analysis. The SEM images of LHS crystal taken in two different magnifications are provided in Fig. 4. Fig. 4a shows the existence o ...
... The HR- SEM analysis is very useful to inspect the nature and surface morphology of the grown crystal. Highly transparent region of the crystal was used for the surface analysis. The SEM images of LHS crystal taken in two different magnifications are provided in Fig. 4. Fig. 4a shows the existence o ...
Failure Modes
... “The greatest stress the material can withstand without any measurable permanent strain” *In most metallic materials the elastic limit and proportional limit are essentially the same. ...
... “The greatest stress the material can withstand without any measurable permanent strain” *In most metallic materials the elastic limit and proportional limit are essentially the same. ...
Strain Rate Dependent Flow Stress Characterization
... The adaptation of metal forming processes from conventional size to micro size has been hindered due to the size effects. Although they are only observed in miniaturized processes, these size effects are not caused by physical or chemical phenomena occurring in scaled down systems but rather they ar ...
... The adaptation of metal forming processes from conventional size to micro size has been hindered due to the size effects. Although they are only observed in miniaturized processes, these size effects are not caused by physical or chemical phenomena occurring in scaled down systems but rather they ar ...
Dislocation
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, but the term 'dislocation' to refer to a defect on the atomic scale was coined by G. I. Taylor in 1934. Some types of dislocations can be visualized as being caused by the termination of a plane of atoms in the middle of a crystal. In such a case, the surrounding 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.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, but a single dislocation typically cannot ""disappear"" on its own.