Spinodal Decomposition
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Analysis of Spinodal Decomposition in Al-Zn and Al-Zn-Cu Alloys Using the Nonlinear Cahn-Hilliard Equation
The phase field model based on the nonlinear Cahn-Hilliard equation was applied to analyze the spinodal decomposition process in Al-Zn and Al-Zn-Cu alloys. Partial differential equations were solved using the explicit finite difference method for the Al- 20, and 35 at. % Zn alloys aged at temperatures between 25 and 100 °C for times from 10 s to 2000 s and
Mat. Res.. Publicado em: 20/03/2017
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2. Phase Separation in Rapid Solidified Ag-rich Ag-Cu-Zr Alloys
The microstructure and phase formation of rapid solidified Ag-rich Ag-Cu-Zr alloys were investigated. Two types of structure; interconnected- and droplet-type structures, were obtained due to phase separation mechanisms. The former was spinodal decomposition and the later was nucleation and growth mechanism. Depending on the alloy compositions, three crystal
Mat. Res.. Publicado em: 17/11/2015
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3. Age-hardenability and related microstructural changes during and after phase transformation in an Au-Ag-Cu-based dental alloy
The aim of this study was to clarify how the microstructural changes during and after phase transformation determine the age-hardenability of an Au-Ag-Cu-based dental alloy. The rapid increase in hardness in the initial stage was the result of rapid atomic diffusion by spinodal decomposition into metastable Ag-rich' and Cu-rich' phases. The constant hardenin
Mat. Res.. Publicado em: 04/12/2012
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4. Decomposição spinodal de ligas do sistema Al-Si-Cu
A decomposição spinodal de ligas de alumínio do sistema Al-Si-Cu foi estudada a partir de diferentes condições termodinâmicas. Duas composições foram selecionadas: A1-1,5%Si- 1,0%Cu e A1-2,5%Si-1,0%Cu, com as composições em peso. Estas ligas foram elaboradas por fusão convecional num forno a gás (GLP) a partir de alumínio, cobre e silício, na c
Publicado em: 2009
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5. Memory effect and fast spinodal decomposition
We consider the modification of the Cahn-Hilliard equation when a time delay process through a memory function is taken into account. We then study the process of spinodal decomposition in fast phase transitions associated with a conserved order parameter. The introduced memory effect plays an important role to obtain a finite group velocity. Then, we discus
Brazilian Journal of Physics. Publicado em: 2007-07
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6. Langevin dynamics of the deconfinement transition for pure gauge theory
We investigate the effects of dissipation in the deconfinement transition for pure SU(2) and SU(3) gauge theories. Using an effective theory for the order parameter, we study its Langevin evolution numerically. Noise effects are included for the case of SU(2). We find that both dissipation and noise have dramatic effects on the spinodal decomposition of the
Brazilian Journal of Physics. Publicado em: 2007-07
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7. "Simulations of 3D two-phase flows using adaptive methods and phase field models" / "Simulações de escoamentos tridimensionais bifásicos empregando métodos adaptativos e modelos de campo fase"
This is the first work that introduces 3D fully adaptive simulations for a phase field model of an incompressible fluid with matched densities and variable viscosity, known as Model H. Solving numerically the equations of this model in meshes locally refined with AMR technique, we simulate computationally tridimensional two-phase flows. Phase field models of
Publicado em: 2007
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8. Chiral transition and the quark-gluon plasma
We discuss a few recent results for the equation of state of strongly interacting matter and the dynamics of chiral phase transition. First, we consider the cases of very high densities, where weak-coupling approaches may in principle give reasonable results, and very low densities, where we use the framework of heavy-baryon chiral perturbation theory. We al
Brazilian Journal of Physics. Publicado em: 2006-03
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9. The transition temperature of the nuclear caloric curve
Experimental studies have obtained the caloric curve of nuclear matter from heavy ion collisions as well as its dependence on the size of the fragmenting source. In particular it has been determined that smaller systems have caloric curves with higher plateau temperatures than larger systems. This work uses molecular dynamics simulations to study the thermod
Brazilian Journal of Physics. Publicado em: 2004-09
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10. Spinodal instability in the quark-gluon plasma
We investigate the onset of spinodal decomposition in a relativistic fluid of quarks coupled to a nonequilibrium chiral condensate. Studying small fluctuations around equilibrium, we identify the role played by sound and chiral waves in the generation of unstable modes.
Brazilian Journal of Physics. Publicado em: 2004-03
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11. Degradação da resistência à corrosão de aços inoxidáveis duplex, devido ao envelhecimento em baixas temperaturas por tempos prolongados. / Degradation of the corrosion resistance of duplex stainless steel due to long aging at low temperatures.
Although duplex stainless steels exhibit good performance in many severe corrosive environments, their corrosion resistance can be hampered by precipitation of chromium (Cr) rich phases during aging heat treatments. Microstructural changes and corrosion behavior in two alloys with high and low content of chromium were investigated. Duplex stainless steels sa
Publicado em: 2004
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12. Estudo da cinÃtica de recristalizaÃÃo da liga de alumÃnio AA 8011 na condiÃÃo H18
The AA 8011 alloy is one of the most versatile commercial aluminum alloys. The diversity of its applications depends not only on its chemical composition, but, mainly, on the microstructures transformations that it comes to suffer. In that context, the study of the recrystallization kinetics assumes an important role for facilitating the control of the workh
Publicado em: 2002