Dictionary of sports science

Concise Dictionary of Materials Science Part 1 pdf

Concise Dictionary of Materials Science Part 1 pdf
... CONCISE DICTIONARY OF MATERIALS SCIENCE Structure and Characterization of Polycrystalline Materials © 2003 by CRC Press LLC A α-Al2O3 Pure alumina ... as consisting of two sublattices: an FCC sublattice of O2– ions and a sublattice of Al 3+ ions occupying two thirds of the octahedral sites in the first one α-Fe Allotropic form of iron having ... stability of α-phase and thereby raising the β/(α + β) transus in the corresponding phase diagram In physical metallurgy of steels, it is referred to as ferrite-stabilizer α-Ti Allotropic form of titanium...
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Concise Dictionary of Materials Science Part 2 pdf

Concise Dictionary of Materials Science Part 2 pdf
... channeling) © 20 03 by CRC Press LLC C χ-carbide In high-carbon steels, a transient phase of the composition Fe5C2 with monoclinic lattice It occurs upon tempering of as-quenched martensite CaF2 structure ... 0970_frame_B Page 13 Friday, August 1, 20 03 7:01 PM B β-Al2O3 Impure alumina whose main impurity is Na2O β eutectoid Ti system Name of a Ti−X alloy system in which the β-stabilizer ... the center of the curvature In a three-dimensional, single-phase structure, it is: ∆g = γgb(ρ1 + 2) where γgb is the grain-boundary energy, and ρ1 and 2 are the principal radii of the boundary...
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Concise Dictionary of Materials Science Part 3 ppt

Concise Dictionary of Materials Science Part 3 ppt
... the angles between the axis of the tension specimen and RD of the sheet dark-field illumination In optical microscopes, such illumination that flat horizontal features of an opaque sample appear ... Allotropic form of iron having BCC crystal structure and existing at atmospheric pressure at temperatures above A4 (i.e., > 1400°C) up to the melting point δ-ferrite Solid solution of alloying elements ... eutectoid decomposition, decomposition of supersaturated solid solution on aging treatment into precipitates and saturated solid solution, decomposition of cementite on graphitization into austenite...
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Concise Dictionary of Materials Science Part 4 potx

Concise Dictionary of Materials Science Part 4 potx
... the hollows of the second layer and above the C hollows of the first layer The atom centers of the fourth layer are arranged in the hollows of the third layer and above the A centers of the first ... in the hollows of the lower layer In the FCC structure, the atom centers of the second layer are arranged in the B hollows of the first layer (see Figure F.2) The atom centers of the third layer ... directions 〈110〉 The radius of tetrahedral void equals 0.225R and that of octahedral void is 0 .41 5R, where R is the atomic radius In a densely packed structure, the atoms of each most densely packed...
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Concise Dictionary of Materials Science Part 5 potx

Concise Dictionary of Materials Science Part 5 potx
... drag is most often used in the sense that the segregated impurity reduces the effective mobility of grain boundaries because the diffusivity of impurity atoms differs from that of the host atoms ... in which there is no coincidence of the lattice points of neighboring lattices, in contrast to coherent or partially coherent interfaces incoherent precipitate/particle Second phase precipitate ... boundary of this kind is always joined to either a coherent twin boundary or the boundaries of the twinned grain The energy and mobility of an incoherent twin boundary are rather close to those of...
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Concise Dictionary of Materials Science Part 6 ppt

Concise Dictionary of Materials Science Part 6 ppt
... Manifestation of the difference in diffusion rates of the atoms of different components in the case of vacancy mechanism, i.e., in substitutional solid solutions An annealing of a sample made of two ... connecting two parallel segments of the same dislocation lying on both sides of the Peierls barrier Kinks can easily glide along with the dislocation kink band Part of a plastically deformed grain ... sample made of two closely contacting parts of different compositions results in the following First, the interface between these parts shifts into the part with the higher intrinsic diffusivity...
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Concise Dictionary of Materials Science Part 7 pot

Concise Dictionary of Materials Science Part 7 pot
... case of uniformly distributed particles, the drag force is referred to as Zener drag and is proportional to f/d particle shearing One of the mechanisms of precipitation hardening by coherent or partially ... between the particles If the particles are coherent, strengthening is determined by particle shearing at Λ smaller than a certain critical spacing orthoferrite Ferrimagnetic oxide of stoichiometry ... increase of the mean particle size overaging Stage of aging characterized by progressive coarsening of the precipitates occurring at the first aging stages Overaging decreases the effect of precipitation...
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Concise Dictionary of Materials Science Part 9 ppt

Concise Dictionary of Materials Science Part 9 ppt
... precipitation of εcarbides, the lattice of tempered martensite is characterized by a tetragonality corresponding to ∼0.2 wt% carbon dissolved in the martensite See steel martensite tempering of steel ... under the supposition that the deformations of the polycrystal and its grains are compatible Reciprocal Taylor factor can be used for polycrys tals instead of Schmid factor, whose magnitude is defined ... In addition, at temperatures ∼600°C, the diffusion of the substitutional alloying elements becomes possible, which leads to the occurrence of special carbides accompanied by cementite dissolution...
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Concise Dictionary of Materials Science Part 10 pptx

Concise Dictionary of Materials Science Part 10 pptx
... austenite in the upper part of bainitic range It consists of packets of ferrite laths (the lath thickness ∼0.2 µm), each lath being separated from the others by fine cementite particles The laths ... alumina (ZTA) Composite containing, apart from Al2O3, 5 10 vol% dispersoid of stabilized tetragonal ZrO2 Its toughening is a result of martensitic transformation of the tetragonal zirconia into monoclinic ... spectrum Distribution of radiation intensity vs its wavelength wavelength-dispersive spectrometry (WDS) Technique for chemical analysis of single-phase materials using spectrometry of fluorescent x-rays...
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