Results 251 to 260 of about 240,120 (294)
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The evolution of dinosaur tooth enamel microstructure
Biological Reviews, 2010The evolution of tooth enamel microstructure in both extinct and extant mammalian groups has been extensively documented, but is poorly known in reptiles, including dinosaurs. Previous intensive sampling of dinosaur tooth enamel microstructure revealed that: (1) the three-dimensional arrangement of enamel types and features within a tooth-the ...
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Microstructural Evolution in Nanocrystalline Ni Coatings
Journal of Materials Research, 2002Gas-atomized Ni powders were mechanically milled under liquid nitrogen and subsequently sprayed using a high-velocity oxygen-fuel thermal spraying system. The resultant coatings were evaluated using various analytical methods, including scanning electron microscopy (SEM), transmission electron microscopy, and atom probe field ion microscopy (APFIM ...
Lau, M. +6 more
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Microstructures and organizational patterns in the evolution of firms
Behavioral Science, 1992The development of two Hayekian concepts as heuristic principles is presented as an exploration of relations between technological processes and firms' organizational systems. This is done by analyzing, within the decisional processes of the economic unit, the forms of technical-organizational configuration that firms must have in order to produce ...
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Examples of evolution of microstructure in ceramics and composites
Microscopy Research and Technique, 1993AbstractIn this article we describe a number of studies involving the direct observation of microstructural evolution. In general these investigations were carried out to establish the mechanistic paths involved. The materials studied range from fibers being evaluated for use in high‐temperature ceramic composites to energetic materials used as ...
P W, Brown +2 more
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Multiscale Modeling of Precipitate Microstructure Evolution
Physical Review Letters, 2002We demonstrate how three "state-of-the-art" techniques may be combined to build a bridge between atomistics and microstructure: (1) first-principles calculations, (2) a mixed-space cluster expansion approach, and (3) the diffuse-interface phase-field model. The first two methods are used to construct the driving forces for a phase-field microstructural
V, Vaithyanathan +2 more
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Phases and evolution of microstructures in Ti–60at.% Al
Acta Materialia, 2012Abstract The formation and stability of Al-rich Ti–Al phases is reviewed and the kinetics of the phase transformations and evolution of lamellar TiAl + r-TiAl 2 microstructures is discussed. For this a couple of Ti–60 at.% Al alloys were processed by different techniques to generate different initial microstructures.
Palm, M. +4 more
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Microstructural evolution and hardening parameters
Materials Science and Engineering: A, 2001The evolution of dislocation structures in polycrystals with increasing strain is described within a framework of grain subdivision by dislocation boundaries and high angle boundaries. The evolving microstructures are characterized with emphasis on morphology and the changes in the misorientation angle across and spacing between deformation induced ...
Niels Hansen, X. Huang, D.A. Hughes
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Microstructural Evolution and Metastability in Active Materials
MRS Proceedings, 1998AbstractMetastable systems pose significant problems in both analysis and simulation. We discuss here the evolution of microstructure in a shape-memory alloy where energetic contributions from disparate scales play determining roles. This is a challenge for modelling since the finest length scales cannot be ‘seen’ at macroscopic level.
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Phosphate-driven microstructural evolution of hydroxyapatite
Dalton TransactionsThe phosphate source governs the HA microstructure via calcium binding and hydrolysis dynamics, enabling tunable nanofibers or microspheres in ricinoleic acid-assisted synthesis.
Yin-chuan Wang +6 more
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Microstructure evolution during irradiation
Journal of Nuclear Materials, 1994Abstract Microstructural evolution in metals and alloys during energetic particle irradiation is reviewed with emphasis placed on the underlying defect reaction processes. The microstructures produced by electron irradiation with a high-voltage electron microscope, fusion-neutron irradiation with a D-T fusion neutron source, fission-neutron ...
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