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Showing 1 to 20 of 430 for “"Grain boundaries"”.
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Grain boundaries in coated conductors
… (the critical current density Jc) was limited by grain boundaries (GBs). In order to reduce their detrimental effects coated conductors have been developed, in which a superconducting thin film is deposited on a polycrystalline, textured substrate. Within certain temperature and magnetic field …
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Diffusion along twist grain boundaries in copper
U of I Only
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Topological descriptions of grain boundaries in graphene
… method to tune the properties of graphene. Grain boundaries made of 5-7 dislocations are the most prominent defect in graphene and have been shown to be responsible for variability in properties. Therefore, we analyze how to change the structure of graphene through control of grain boundary …
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Molecular dynamics study of ionic grain boundaries
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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Computer simulation of grain boundaries in rutile
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Deformation Mechanisms at Grain Boundaries in Polycrystal Plasticity
Strengthening by grain boundaries is commonly attributed to the dislocation pile-up at the boundary describing the effect of grain size, i.e. the Hall-Petch relation. In this work, the importance of the boundary structure is emphasized, along with grain size, in predicting the flow stress using …
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The Properties of Grain Boundaries in YBa2Cu3O7-d
Grain boundaries form the basis of an important Josephson junction technology in the cuprates and also limit the superconducting critical currents attainable in practical, polycrystalline materials. An improved understanding of these defects is therefore important for applications. The status of …
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Nonlinear Dynamics of Vortices in Different Types of Grain Boundaries
… are made of polycrystalline materials in which grain boundaries can limit maximum RF currents and produce additional power dissipation sources due to local penetration of Josephson vortices. The essential physics of vortex penetration and mechanisms of dissipation of vortices driven by strong RF …
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Optical absorption associated with grain boundaries in n-type germanium
The optical absorption 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 …
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Grains and grain boundaries in lamellar styrene--butadiene block copolymers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.
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TEM study of dislocation structure in grain boundaries in metals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
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Oxygen diffusion in dislocations and grain boundaries in magnesium oxide
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1985.
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Effect of Grain Boundaries on the Electrical Conductivity of Nickel-Monoxide
Made available in DSpace on 2014-12-10T17:32:30Z (GMT). No. of bitstreams: 1 6402979.pdf: 2232294 bytes, checksum: f482c7afe7c92270c1ca3631b01570b3 (MD5) Previous issue date: 1963
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The Electronic Properties of Thin Film YBa2Cu3O7 Low Angle Grain Boundaries
… are now limited by 2D networks of low angle grain boundaries (LAGBs) with misorientation θm = 1 - 10°. In order to understand and optimise current transfer in these materials it is essential to elucidate the electromagnetic behaviour of the LAGB. This work presents an investigation into the …
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Energetics and Deformation Response of Random Grain Boundaries in FCC Nickel
… energetics and deformation response of random grain boundaries in polycrystalline Nickel. Computer generated samples of defect-free Ni were created, plastically deformed, and examined as a baseline understanding to the underlying mechanisms of deformation and intergranular fracture in FCC …
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Modeling the Role of Surfaces and Grain Boundaries in Plastic Deformation
… are used to understand the role of surfaces and grain boundaries in the deformation response of metallic materials. This research utilizes atomistic scale modeling to study nanoscale deformation phenomena with time and spatial resolution not available in experimental testing. Molecular dynamics …
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The Effect of Grain Boundaries on The Electrical Conductivity of Cuprous-Oxide
Made available in DSpace on 2014-12-10T17:32:33Z (GMT). No. of bitstreams: 1 6500105.pdf: 3207817 bytes, checksum: 15d7cf6168aa1870a53c2baeeedefa68 (MD5) Previous issue date: 1964
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A phase field model for the gallium permeation of aluminum grain boundaries
Interfaces, such as grain boundaries, solid-liquid interfaces and solid-solid heterophase interfaces, are important features found in materials. Material properties such as fracture toughness, corrosion susceptibility and high temperature creep are influenced by grain boundary physics. The …
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Atomic-scale assessment of graphene-substrate interactions, grain boundaries, and materials for heterostructures
… misoriented graphene domains that form grain boundaries (GBs) when these domains merge. These graphene GBs strongly perturb the local graphene electronic structure, leading to localized states and decreased the local work functions. The GBs induce p-n-p and p-p’-p (p’ < p) potential …
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