Metastability
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Fracture Modes of AISI Type 302 Stainless Steel Under Metastable Plastic Deformation
Martensitic transformation can be induced by plastic deformation in metastable iron-based alloys, such as stainless steels containing limited amounts of C, Ni and Cr. This transformation takes place at the temperature range from Ms and Md, usually at relatively lower temperature values. The transformed martensite has been associated with maximum ultimate str
Mat. Res.. Publicado em: 09/11/2017
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2. Propriedades físicas do SnO2: defeitos, impurezas, ligas e superredes. / Physical properties of SnO2: defects, impurities, alloys and superlattices.
O dioxido de estanho na estrutura rutila (SnO2) é um semicondutor de gap largo e faz parte da classe dos óxidos condutores transparentes (TCO). Possui gap direto de 3,6 eV e condutividade do tipo n, mesmo quando não dopado intencionalmente. Estudos teóricos e experimentais atribuem este comportamento à presença de defeitos intrínsecos. Por outro lado,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/08/2011
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3. Efeito da adição de oxigênio na estabilidade e metaestabilidade de fases em ligas Ti-Nb aplicadas como biomaterial / Effect of oxygen additions in the phase stability and metastability of Ti-Nb alloys applied as biomaterials
Em se tratando de biomateriais ortopédicos, as ligas de titânio tipo ß apresentam diversas vantagens em relação às ligas do tipo alfa + ß. Ligas contendo elementos ß estabilizadores são mais interessantes em função da alta resistência mecânica específica, da elevada resistência à corrosão e da excelente biocompatibilidade. Em adição, essas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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4. Atomistic simulations of supercooled gallium / Simulações atomisticas do galio super-resfriado
Recently, the existence of a liquid-liquid transition in pure substances has been proposed as an explanation of anomalous behaviors such as the increase of response functions (isothermal compressibility, coefficient of thermal expansion, specific heat) with decreasing temperature displayed by some liquids. The existence of this type of transition has been de
Publicado em: 2009
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5. Deformation induced martensite in an AISI 301LN stainless steel: characterization and influence on pitting corrosion resistance
In austenitic stainless steels, plastic deformation can induce martensite formation. The induced martensite is related to the austenite (gamma) instability at temperatures close or below room temperature. The metastability of austenite stainless steels increases with the decreasing of stacking fault energy (SFE). In this work, the deformation induced martens
Materials Research. Publicado em: 2007-12
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6. Influence of different surface treatments on the fracture toughness of a commercial ZTA dental ceramic
The objective of this study was to investigate how mechanical surface treatments performed for removal of excess of molten glass, influence the fracture toughness of a dental zirconia toughened alumina (In-Ceram® Zirconia). Infiltrated ZTA disks were submitted to three different surface treatments (grinding, sandblasting and grinding + sandblasting + anneal
Materials Research. Publicado em: 2007-03
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7. Influence of mechanical surface treatments on the indentation fracture toughness of glass infiltrated zirconia toughened alumina "GI-ZTA" disks
The main objective of this study was to evaluate the influence of mechanical surface treatments for excess glass removal on the fracture toughness of a glass infiltrated zirconia toughened alumina "GI-ZTA" disks (In-Ceram® Zirconia). The GI-ZTA disks were submitted to three different mechanical surface treatments after glass infiltration (grinding, sandblas
Matéria (Rio de Janeiro). Publicado em: 2007
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8. Stability and metastability of phases in Ti-Nb alloys / Estabilidade e metaestabilidade de fases em ligas Ti-Nb
Ligas de titânio formam a classe mais versátil de materiais metálicos utilizados para aplicações biomédicas. As ligas de Ti tipo ? usadas em dispositivos ortopédicos envolve, além de excelentes propriedades como baixa densidade, elevada resistência mecânica e excepcional resistência à corrosão, a biocompatibilidade com elementos de liga, tais co
Publicado em: 2006
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9. Estudo experimental da evaporação de jatos de iso-octano superaquecido. / Experimental study of evaporating jets of superheated iso-octane.
The main goal of this thesis is to present results of experiments with flashing liquid jets of iso-octane. The experiments were carried out with a liquid jet issuing from a small nozzle into a low-pressure chamber. High degrees of metastability were obtained as the liquid jet expanded within the nozzle. Injection pressure and temperature were controlled to t
Publicado em: 2005
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10. Comportamento de um autÃmato celular sem e com ruÃdo aleatÃrio
Elements of f0; : : : ;mgZd are called configurations. We work with cellular automata, which can be presented as FrD , where Fr is a random operator which acts on measures on the set of configurations and D is a deterministc operator which acts on configurations. Fr increases state of every point in ZZd with probability r >0 independently and D is a uniform
Publicado em: 2004
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11. Regulation of protein function by native metastability
In common globular proteins, the native form is in its most stable state. In contrast, each native form exists in a metastable state in inhibitory serpins (serine protease inhibitors) and some viral membrane fusion proteins. Metastability in these proteins is critical to their biological functions. Mutational analyses and structural examination have previous
The National Academy of Sciences.
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12. QUANTIZATION AND METASTABILITY OF SUPERCURRENTS*