Results 271 to 280 of about 47,195 (313)
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Generation and evolution of inelastic microstructures ‐ an overview
GAMM-Mitteilungen, 2012AbstractIn this paper we give an overview on the modeling of inelastic microstructures using variational methods. We start by discussing the underlying variational principles for inelastic materials, derive evolution equations for internal variables, and introduce the concept of condensed energy. As a mathematical prerequisite we review the variational
Hackl, Klaus +2 more
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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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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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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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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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Evolution of microstructures in materials induced by electropulsing
Micron, 2003Nanostructures were formed in several conventional materials under single electropulsing, that is nanophases of alpha-Cu(Zn) and beta'-(CuZn) in a cold-worked alpha-Cu(Zn) alloy, nanosized gamma-Fe in a low-carbon steel, nanosized alpha-Al in a superduralumin, and orientated nanosized TiC in a TiC/NiCr cermet.
W, Zhang, M L, Sui, Y Z, Zhou, D X, Li
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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 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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