Author
Paulo Rangel Rios
Bio: Paulo Rangel Rios is an academic researcher from Federal Fluminense University. The author has contributed to research in topics: Grain growth & Nucleation. The author has an hindex of 16, co-authored 130 publications receiving 999 citations.
Topics: Grain growth, Nucleation, Grain boundary, Martensite, Austenite
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the spread of martensite reaction is modeled with the help of microstructural path analysis, and the theoretical model shows good agreement with experimental data from Fe-31.wt.% Ni and Fe-0.01% C with different starting grain sizes.
35 citations
TL;DR: In this article, a rigorous mathematical approach based on stochastic geometry concepts is presented to extend previous Johnson-Mehl, Avrami, Kolmogorov treatment of transformation kinetics to situations in which nuclei are not homogeneously located in space but are located in clusters.
34 citations
TL;DR: In this article, a new theoretical approach is developed for the derivation of self-similar grain size distributions for three-dimensional polycrystals, based on representing each class of irregular N-sided polyhedral grains in a space-filling network by the corresponding topological proxy.
33 citations
TL;DR: In this paper, the grain boundary area per unit of volume, SV, and the interface area of Al6Mn precipitates, SVP, were measured in a high purity Al-1wt%Mn alloy for an annealing time of 3600 s at temperatures ranging from 500 to 620 °C.
33 citations
32 citations
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TL;DR: In this article, a review article summarizes the recent progresses on the complex interaction between second-phase particles and recrystallization and the science behind them, and concludes that the double-edge effect of second phase particles on the behavior and mechanical properties of metallic materials is still far from being clear.
361 citations
TL;DR: The Hillert theory can be regarded as an accurate description for the 3D ideal grain growth, and the large-scale phase-field simulation confirms the3D growth law obtained from the Surface Evolver simulations in smaller scales.
Abstract: We developed an efficient computation scheme for the phase-field simulation of grain growth, which allows unlimited number of the orientation variables and high computational efficiency independent of them Large-scale phase-field simulations of the ideal grain growth in two-dimensions (2D) and three-dimensions (3D) were carried out with holding the coalescence-free condition, where a few tens of thousands grains evolved into a few thousand grains By checking the validity of the von Neumann-Mullins law for individual grains, it could be shown that the present simulations were correctly carried out under the conditions of the ideal grain growth The steady-state grain size distribution in 2D appeared as a symmetrical shape with a plateau slightly inclined to the small grain side, which was quite different from the Hillert 2D distribution The existence of the plateau stems from the wide separation of the peaks in the size distributions of the grains with five, six, and seven sides The steady-state grain size distribution in 3D simulation of the ideal grain growth appeared to be very close to the Hillert 3D distribution, independent of the initial average grain size and size distribution The mean-field assumption, the Lifshitz-Slyozov stability condition, and all resulting predictions in the Hillert 3D theory were in excellent agreement with the present 3D simulation Thus the Hillert theory can be regarded as an accurate description for the 3D ideal grain growth The dependence of the growth rate in 3D simulations on the grain topology were discussed The large-scale phase-field simulation confirms the 3D growth law obtained from the Surface Evolver simulations in smaller scales
268 citations
TL;DR: In this article, it was shown that the nugget zone grain structure is inherently unstable at high temperatures, despite the presence of Al 3 Zr dispersoids that inhibit grain boundary mobility.
264 citations
TL;DR: A comprehensive review of recent progress in TMP of AHSSs, with focus on the processing-microstructure-property relationships of the processed AHSS, is provided in this paper.
251 citations
TL;DR: The evolution in the understanding of the recrystallization phenomena is summarized in this article, where the main developments concerning recrestallization are presented from a historical perspective, as well as definitions and concepts involving recrasing are presented regarding it as a solid-state reaction that occurs by nucleation and growth.
Abstract: The evolution in the understanding of the recrystallization phenomena is summarized in this paper. Initially the main developments concerning recrystallization are presented from a historical perspective. Definitions and concepts involving recrystallization are presented regarding it as a solid-state reaction that occurs by nucleation and growth. The recrystallization nucleation mechanisms are subsequently discussed. Finally, the growth step is highlighted, emphasizing boundary and sub-boundary mobilities and the forces acting on the high angle grain boundaries that sweep the microstructure during recrystallization.
244 citations