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Showing 1 to 15 of 15 for “"bicrystals"”.
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Corrosion of Some Tilt and Twist Boundaries in Aluminum Bicrystals
Made available in DSpace on 2014-12-10T17:57:41Z (GMT). No. of bitstreams: 1 6507066.pdf: 1789755 bytes, checksum: 12ecbb6a4bc6615e0d30c9759c159bfc (MD5) Previous issue date: 1965
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Computer generation of Kikuchi projections and characterization of general bicrystals
… axis to within ±0.2°. For low-angle bicrystals, the misfit angle can be obtained to within ±0.1°, and the axis of misfit to within ±4°. The boundary normals so determined are generally accurate to ±2° if suitable correction is made for magnification changes during crystal tilt. …
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Diffusion of thallium chloride into single crystals and bicrystals of potassium chloride.
Massachusetts Institute of Technology. Dept. of Metallurgy and Materials Science. Thesis. 1969. Ph.D.
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Deformation behavior of cylindrical block copolymer bicrystals : pathway to understanding block copolymer grain boundaries
Model bicrystals made by adhering pieces of near-single-crystal styrene-isoprene-styrene (SIS) cylindrical block copolymer (BCP), produced by a roll-casting process; yield various types of pure tilt grain boundaries. The study of the deformation of the bicrystals, each containing one grain …
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Secondary-ion mass spectrometric analysis of oxygen-grain boundary diffusion in magnesium-oxide bicrystals
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Grain boundary self-diffusion in sodium chloride
… pure and calcium chloride doped sodium chloride bicrystals was investigated. No enhanced diffusion of ²²sodium along the grain boundaries was observed. Between 400°C and 500°C the chlorine grain boundary diffusion parameter, D'Δ, is described by D'Δ = (D'Δ)₀exp (-Q<sub>b</sub>/kT), where (D'Δ)₀ …
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On kinetics and thermodynamics of high angle grain boundaries in aluminium : experimental study on grain boundary properties in bi- and tricrystals
… curved <111> grain boundaries was studied in Al-bicrystals. The rate of grain boundary displacement and the shape of the moving GB were measured. Two types of boundaries were investigated: curved tilt GBs containing different sets of boundary planes (elements) and curved mixed GBs which consist …
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Roles of grain boundaries in cleavage cracking and thermal crack arrest experiments in iron-silicon alloy
… toughness measurement experiments in bicrystals of Fe-3%Si alloy, specific measurements of the fracture resistance of a random selection of high angle grain boundaries and associated fractographic studies have led to quantitative models of the resistance that high-angle grain …
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Grain boundary studies in ordered intermetallic compound Ni3 Al
… crystal was obtained. However, an extension to bicrystals was not successful. In order to study the possible disordering and segregation near grain boundaries, two different atomistic computer simulations, namely, molecular statics simulation and two dimensional lattice gas model, were carried …
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Optical absorption associated with grain boundaries in n-type germanium
… by 40 to 25 0 grain boundaries in germanium bicrystals in the spectral region 0040 ev to Oe80 ev was measured using two modulation techniques. The first technique measured directly the difference in optical absorption between the grain boundary layer and the adjacent single crystal regions. …
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Predictive Microstructural Modeling of Grain-boundary Interactions and Their Effects on Overall Crystalline Behavior
… transmission in grain-boundary (GB) regions for bicrystals and polycrystals with different random and coincident site lattice (CSL) GB arrangements. This scheme is coupled to a dislocation-density crystalline plasticity formulation and specialized finite-element scheme at different physical …
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Grain boundary motion under high temperature low cycle deformation : study of mechanism, kinetics and driving force
… deformation (HT-LCF) of high purity aluminium bicrystals under two distinct conditions of cyclic deformation. The first part of the study emphasises the high temperature cyclic stress response of <112> tilt grain boundaries where motion was caused by a plastic stress of cyclic deformation, …
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Novel applications of the Josephson Effect: Ferroelectric Characterisation and Capacitively Shunted Grain Boundary Junctions
… and Ca doped YBa2Cu3O7-d grain boundaries on 24° bicrystals. This behaviour could not be explained by tunneling models of grain boundary current transport, and requires current flow over a fraction of the area of the grain boundary.
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Atomistic modelling of precipitation in Ni-base superalloys
… ordering in Ni-Al single crystals and in Ni-Al bicrystals containing coincidence site lattice grain boundaries (GBs) and we do this at high temperatures, which are representative of typical heat treatment schedules including quenching and annealing. For this we use the atomistic simulation …
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Atomistic simulations of grain boundary migration in face centred cubic metals
… as various planar tilt GBs in face-centred cubic bicrystals have been performed. The utilized simulation method of choice was molecular dynamics (MD). Due to the planar geometry of the studied GBs, no driving force (DF) on the GB is exerted due to GB curvature. Therefore one necessary and …