Download or read book Computer Modelling of Particle Limited Grain Growth and Its Experimental Verification written by and published by . This book was released on 1989 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data from two simulations on particle limited grain growth are reported. For 3D simulations the same type of strong correlation between particles and grain boundaries previously found in 2D simulations was found with the limiting grain size scaling in 3D with (l/f){sup 0.31}. Very much higher particle correlation with grain boundaries and particularly with grain corners was obtained than expected for the random microstructure. The size distribution of the pinned grain structures showed considerable differences from that of dynamically evolving single phase structures -- notably an absence of small grains with radii less than 0.3 R and the presence of a few large grains in the pinned samples. In 2D simulations from a finite starting grain size which may explain at least part of the wide scatter in pinned grain sizes reported from experimental studies. It is suggested that normal grain growth ceases when the smallest grains in the size distribution can no longer shrink. Finally limited new experimental data on grain growth with a stable dispersion in an Al-Fe alloy is reported. This data is, at least partially, in agreement with the simulation results but most strikingly shows a ready transition to abnormal grain growth at low volume fraction of second phase particles. A simple model for this effect is proposed -- based on the Zener analysis but applied only to abnormal grain growth into a fine grain structure pinned to a small grain size in the manner suggested by the simulations. 39 refs., 14 figs., 5 tabs.
Download or read book Effect of Second Phase Particles on Grain Growth written by Kang Li and published by . This book was released on 1992 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Large Scale Statistics for Computational Verification of Grain Growth Simulations with Experiments written by and published by . This book was released on 2002 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is known that by controlling microstructural development, desirable properties of materials can be achieved. The main objective of our research is to understand and control interface dominated material properties, and finally, to verify experimental results with computer simulations. We have previously showed a strong similarity between small-scale grain growth experiments and anisotropic three-dimensional simulations obtained from the Electron Backscattered Diffraction (EBSD) measurements. Using the same technique, we obtained 5170-grain data from an Aluminum-film (120 [mu]m thick) with a columnar grain structure. Experimentally obtained starting microstructure and grain boundary properties are input for the three-dimensional grain growth simulation. In the computational model, minimization of the interface energy is the driving force for the grain boundary motion. The computed evolved microstructure is compared with the final experimental microstructure, after annealing at 550 C. Characterization of the structures and properties of grain boundary networks (GBN) to produce desirable microstructures is one of the fundamental problems in interface science. There is an ongoing research for the development of new experimental and analytical techniques in order to obtain and synthesize information related to GBN. The grain boundary energy and mobility data were characterized by Electron Backscattered Diffraction (EBSD) technique and Atomic Force Microscopy (AFM) observations (i.e., for ceramic MgO and for the metal Al). Grain boundary energies are extracted from triple junction (TJ) geometry considering the local equilibrium condition at TJ's. Relative boundary mobilities were also extracted from TJ's through a statistical/multiscale analysis. Additionally, there are recent theoretical developments of grain boundary evolution in microstructures. In this paper, a new technique for three-dimensional grain growth simulations was used to simulate interface migration by curvature driven motion. This method utilizes gradientweighted moving finite elements (GWMFE) combined with algorithms for performing topological reconnections on the evolving mesh. We have previously showed a strong similarity between small-scale grain growth experiments and anisotropic three-dimensional simulations obtained from the EBSD measurements. Using the same technique, we obtained 5170-grain data from a thin Aluminum film with a columnar grain structure and compared the computational results with experiments.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recrystallization 90 written by T. Chandra and published by . This book was released on 1990 with total page 946 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Materials Architecture written by J. B. Bilde-Sørensen and published by Ris National Laboratory. This book was released on 1989 with total page 1290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recrystallization and Related Annealing Phenomena written by Anthony Rollett and published by Elsevier. This book was released on 2004-02-02 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recrystallization and Related Annealing Phenomena fulfils the information needs of materials scientists in both industry and academia. The subjects treated in the book are all active research areas, forming a major part of at least four regular international conference series. This new 2nd edition ensures the reader has access to the latest findings, essential to those working at the forefront of research in universities and laboratories. For those in industry, the book highlights applications of the research and technologically important examples. In particular, the second edition builds on the significant progress made recently in the following key areas: - Deformed state, including deformation to very large strains - Characterisation of microstructures by electron backscatter diffraction (EBSD) - Modelling and simulation of annealing - Continuous recrystallization - Fully revised and up-to-date, the second edition highlights the significant progress made recently in this important area of research - Detailed coverage, much more comprehensive treatment than is found in textbooks on physical metallurgy bridges the gap between theory and practice by examining the application of quantitative, physically based models to metal forming processes
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Continuum Scale Simulation of Engineering Materials written by Dierk Raabe and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 885 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book fills a gap by presenting our current knowledge and understanding of continuum-based concepts behind computational methods used for microstructure and process simulation of engineering materials above the atomic scale. The volume provides an excellent overview on the different methods, comparing the different methods in terms of their respective particular weaknesses and advantages. This trains readers to identify appropriate approaches to the new challenges that emerge every day in this exciting domain. Divided into three main parts, the first is a basic overview covering fundamental key methods in the field of continuum scale materials simulation. The second one then goes on to look at applications of these methods to the prediction of microstructures, dealing with explicit simulation examples, while the third part discusses example applications in the field of process simulation. By presenting a spectrum of different computational approaches to materials, the book aims to initiate the development of corresponding virtual laboratories in the industry in which these methods are exploited. As such, it addresses graduates and undergraduates, lecturers, materials scientists and engineers, physicists, biologists, chemists, mathematicians, and mechanical engineers.
Download or read book Metals Abstracts written by and published by . This book was released on 1996 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Grain Growth in Polycrystalline Materials II written by T. Watanabe and published by Trans Tech Publications. This book was released on 1996 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Grain Growth is one of the most fundamental microstructural changes, and occurs in all types of polycrystalline material. It is of major scientific interest, and of great importance in a wide range of industrial applications.
Download or read book Simulation and Theory of Evolving Microstructures written by ASM International. Materials Science Division. Computer Simulation Technical Activity and published by Warrendale, Pa. : Minerals, Metals, and Materials Society. This book was released on 1990 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Kinetic Model of Particle inhibited Grain Growth written by Gary Scott Thompson and published by . This book was released on 2001 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: An improved kinetic model for particle-inhibited grain growth in Al 2O3-SiC was developed using a modified-Zener approach. The comparison of model predictions with experimental grain growth data indicated that significant discrepancies (as much as 4--5 orders of magnitude) existed. Based on this, it was concluded that particles had a much more significant effect on grain growth kinetics than that caused by a simple reduction of the boundary driving force due to the removal of boundary area. Consequently, it was also concluded that the conclusion drawn from the earlier kinetic analysis regarding the validity of a modified-Zener model was incorrect.
Download or read book Experimental Investigation and Computer Simulation of Grain Growth and Microstructur Evolution in 2D Polycristals written by Yingxiao Ma and published by . This book was released on 2008 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Growth and Coarsening written by Lorenz Ratke and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: 100 years after the first observation of ripening by Ostwald and 40 years after the first publication of a theory describing this process, this monograph presents in a self-consistent and comprehensive manner, all the bits and pieces of coarsening theories so that the main issues and the underlying mathematics of self-similar coarsening of dispersed systems can be understood. Rather than giving a complete survey of the field, it presents a careful derivation of the existing results and places them into some perspective.
Download or read book Sintering Technology written by Randall M. German and published by CRC Press. This book was released on 2020-09-30 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the sintering conference held at the Pennsylvania State University, USA, this text presents advances in the application of sintering to the most important industrial materials. It offers results on both solid-state and microphase sintering as well as microstructure evolution, and introduces new applications, processes, materials and solutions to technical problems.
