Download or read book Experimental Investigation and Thermodynamic Modeling of the Al Cr Mo Ni System and Its Sub systems written by Jian Peng and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamic Modeling and Experimental Investigation of the Mg Al Ca Sr System written by Mohammad Aljarrah and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, a self-consistent thermodynamic database for the Mg-Al-Ca-Sr system using the modified quasichemical model has been constructed. The thermodynamic description of the quaternary system was established by combining the thermodynamic descriptions of the constituent binary and ternary sub-systems. The Mg-Al-Ca and Mg-Al-Sr systems were investigated by combining thermodynamic modeling and experimental investigation. The experimental investigation has been performed using DSC, XRD, SEM and EPMA. Also, isothermal sections at 300°C and 400°C were constructed for the Mg-Al-Ca and Mg-Al-Sr systems. In the Mg-Al-Sr system, six ternary solubilities of the binary compounds extended into the ternary system have been found and denoted as (Mg 17 Sr 2), (Mg 23 Sr 6), (Mg 38 Sr 9), (Mg 2 Sr), (Al 4 Sr) and (Al 2 Sr). The reported ternary compound in the literature (Mg 58 Al 38 Sr 4) has been observed in this work. In the Mg-Al-Ca system, three binary compounds were found to dissolve the third component in the ternary system and were denoted as (Al 2 Ca), (Al 3 Ca 8), and (Mg 2 Ca). The ternary compound (C36) reported in the literature has been confirmed. A comparison between the calculated liquidus projection of the Mg-Ca-Sr system using the modified quasichemical model and random solution model has been presented. It was found that while the random solution model agrees well with the experimental phase diagram, the modified quasichemical model gives better agreement with the experimental thermodynamic data and the experimental phase diagram. Liquidus projection of the Al-Ca-Sr system was calculated using the modified quasichemical model and combined with the other three ternaries in one database for the Mg-Al-Ca-Sr system.
Download or read book Thermodynamic Modeling and Experimental Investigation of the Al Cu Mg Zn Quaternary System written by Haiyan Liang and published by . This book was released on 1998 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Thermodynamics written by H. L. Lukas and published by . This book was released on 2007-07-12 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase diagrams are used in materials research and engineering to understand the interrelationship between composition, microstructure and process conditions. In complex systems, computational methods such as CALPHAD are employed to model thermodynamic properties for each phase and simulate multicomponent phase behavior. Written by recognized experts in the field, this is the first introductory guide to the CALPHAD method, providing a theoretical and practical approach. Building on core thermodynamic principles, this book applies crystallography, first principles methods and experimental data to computational phase behavior modeling using the CALPHAD method. With a chapter dedicated to creating thermodynamic databases, the reader will be confident in assessing, optimizing and validating complex thermodynamic systems alongside database construction and manipulation. Several case studies put the methods into a practical context, making this suitable for use on advanced materials design and engineering courses and an invaluable reference to those using thermodynamic data in their research or simulations.
Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation and Modeling of the Liquid solid Phase Equilibira in the Fe Cr Ni System written by Mark Allen Suer and published by . This book was released on 1990 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Thermodynamics of Materials written by Zi-Kui Liu and published by Cambridge University Press. This book was released on 2016-06-30 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrates fundamental concepts with experimental data and practical applications, including worked examples and end-of-chapter problems.
Download or read book Thermodynamic Modeling and First principles Calculations of the Cr Hf Y Ternary System written by Bradley Hasek and published by . This book was released on 2010 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the thermodynamic modeling of the ternary Cr-Hf-Y system. Chromium, hafnium, and yttrium are all used as alloying elements in nickel superalloys. Nickel superalloys usually contain many different alloying elements, so there becomes a need to understand the phase equilibria of large, multicomponent systems. This can be accomplished by using the CALPHAD method of modeling. CALPHAD modeling requires experimental data to better model the system. In the absence of experimental data, first-principles calculations can be used to predict thermochemical data. Before modeling the Cr-Hf-Y system, the binary Cr-Hf, Cr-Y, and Hf-Y systems must be modeled. In the Cr-Y and Hf-Y system, there is limited experimental data, so first-principles calculations are done on the BCC and HCP solid solution phases using special quasirandom structures (SQS's) to model the disordered systems. The symmetry is also investigated to ensure symmetry is not lost during relaxation. Using the first-principles calculations, the enthalpy of mixing is used to model these systems. The Cr-Hf system is modeled with experimental data and with first-principles calculations done on the Laves phase. With the three binary systems modeled, the ternary system is then modeled without any experimental data present. Isothermal sections are presented from 1273 K to 2200 K.
Download or read book Chemical Thermodynamics of Nickel written by and published by Elsevier. This book was released on 2005-04-08 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to quantitatively predict the chemical reactions that hazardous materials may undergo in the environment, it is necessary to know the relative stabilities of the compounds and complexes that may be found under certain conditions. This type of calculations may be done using consistent chemical thermodynamic data, such as those contained in this book for inorganic compounds and complexes of nickel.* Fully detailed authoritative critical review of literature.* Integrated into a comprehensive and consistent database for waste management applications.* CD ROM version.
Download or read book Coupled Thermodynamic Modeling and Experimental Study of Na2O FeO Fe2O3 CaO MgO A12O3 SiO2 System written by Elmira Moosavi Khoonsari and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The significance of the Na2O-FeO-Fe2O3-CaO-MgO-Al2O3-SiO2 system stems from its applications in industrial processes and natural phenomena. This system in whole or in part was studied for the cooling system of fast breeder reactors, the desulfurization of hot metal and liquid steel, the production of bioactive glasses, coal-combustion slags, the reduction process of bauxite with soda for the production of Al2O3, and the production of solid-state electrodes for electrochemical cells. It also possesses many well-known minerals such as wüstite, spinel, corundum, aegirine, etc. which are of importance in geology. However, phase equilibria in this system are indeed very complex due to the change of Fe oxidation state with oxygen partial pressure and the substitution of Fe3+ by Al3+ in solid solutions. Moreover, the high vapor pressure of sodium, hygroscopicity, high viscosity of SiO2-rich melts, and high fluidity of Na2O- and FeO-rich melts make the experimental study of this system quite challenging. As a result, experimental results in this system were often inconsistent and limited in terms of composition and temperature. Therefore, the construction of a coherent thermodynamic database for the Na2O-FeO-Fe2O3-CaO-MgO-Al2O3-SiO2 system is essential to optimize existing material processes and to develop new processes and advanced materials.All solid and liquid phases of two binaries, six ternaries and two multicomponent sub-systems in the Na2O-FeO-Fe2O3-CaO-MgO-Al2O3-SiO2 system were critically evaluated and optimized in the current study. Using proper thermodynamic models considering the crystal structure of each phase reduces the number of model parameters and thus, enhances the predictive ability of models especially in high order systems. The molten oxide phase was modeled using the Modified Quasichemical Model which takes into account second-nearest-neighbor cation ordering. Extensive solid solutions such as meta-oxides, [beta]"-alumina and pyroxene were treated within the frame work of Compound Energy Formalism with the consideration of their sublattice crystal structures. The wüstite solid solution was modeled using polynomial expansions of the excess Gibbs energy. The sulfide dissolution in the molten oxide phase was modeled using the Modified Quasichemical Model in quadruplet approximation taking into account both first and second-nearest-neighbor short range ordering, simultaneously. Experimental data in the Na2O-FeO-Fe2O3-Al2O3 system were very limited. Hence, key phase diagram experiments and thermodynamic optimization were conducted in this system. Phase diagram experiments were performed using the quenching method followed by Electron Probe Micro-Analysis and X-Ray Diffraction for phase identification. Two- and three-phase equilibria of this system including solid and liquid phases were determined, and the presence of [beta]"-alumina solid solution with a large miscibility gap was revealed for the first time in this work. The developed database was applied to predict the sulfide dissolution in the Na2O-FeO-Fe2O3-CaO-MgO-MnO-Al2O3-SiO2 molten oxide phase which is of high importance for the production of low sulfur steels. Based on the present thermodynamic modeling results, it was shown, for the first time, that the sulfide capacity of Na2O-containing oxide melts is not always a unique property of a given melt composition, and can vary with the gas composition in equilibrium with the oxide melt." --
Download or read book Methods for Phase Diagram Determination written by Ji-Cheng Zhao and published by Elsevier. This book was released on 2011-05-05 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phase diagrams are "maps" materials scientists often use to design new materials. They define what compounds and solutions are formed and their respective compositions and amounts when several elements are mixed together under a certain temperature and pressure. This monograph is the most comprehensive reference book on experimental methods for phase diagram determination. It covers a wide range of methods that have been used to determine phase diagrams of metals, ceramics, slags, and hydrides.* Extensive discussion on methodologies of experimental measurements and data assessments * Written by experts around the world, covering both traditional and combinatorial methodologies* A must-read for experimental measurements of phase diagrams
Download or read book Coupled Experimental and Thermodynamic Modeling of A12O3 CaO FeO Fe2O3 MgO MnO Mn2O3 SiO2 TiO3 TiO2 System written by Sourav Panda and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The phase diagram and thermodynamic properties of the Al2O3-CaO-FeO-Fe2O3-MgO-MnO-Mn2O3-SiO2-Ti2O3-TiO2 system are important in various applications such as steelmaking, refractories, advanced ceramics, petrology and geochemistry. In the present work, the available thermodynamic database for the Al2O3-CaO-FeO-Fe2O3-MgO-SiO2 system was expanded toward the Mn and Ti oxide systems to develop an accurate thermodynamic database for the ten-component system. For this purpose, a complete literature review, critical evaluation and thermodynamic optimization of the phase diagrams and thermodynamic properties of related systems at 1 atm was performed. As part of the thermodynamic study, key phase diagram experiments were performed in the Fe-Ti-O, Mn-Ti-O, Al-Ti-O, Fe-Mn-Ti-O, Mg-Mn-Ti-O, Mn-Si-Ti-O, and Mn-Al-Ti-O systems in air to obtain unknown phase equilibria between the liquid phase and complex solid solutions and resolve any inconsistencies among existing experimental data in the literature.Phase diagram experiments were performed using the classical equilibration and quenching technique. Phase analysis was performed using Electron Probe Microanalysis (EPMA) and X-ray Diffraction (XRD) on all the quenched samples. In the Al-Ti-O system, the solubility of Al2O3 in the rutile (TiO2) solid solution was measured at high temperature. In the Fe-Ti-O system, the liquidus, solubility of Fe2O3 in the rutile (TiO2) solution, and the homogeneity ranges of Fe2O3-FeTiO3 ilmenite and Fe2TiO5-Ti3O5 pseudobrookite solutions were determined at high temperature. In the Mn-Ti-O system, the liquidus, MnO solubility in rutile and the homogeneity range of Mn3O4-Mn2TiO4 spinel were measured. In the Mg-Mn-Ti-O, Fe-Mn-Ti-O and Mn-Si-Ti-O systems, the complex phase equilibria between liquid and solid solutions were experimentally elucidated for the first time in air atmosphere. For the thermodynamic optimization, the liquid phase was described using the Modified Quasichemical Model considering short-range ordering in the molten oxide and the Gibbs energies of the complex solid solutions pseudobrookite, ilmenite and spinel were described using the Compound Energy Formalism considering the crystal structure of each solid solution. Using the thermodynamic models with optimized model parameters in binary and ternary systems, the phase diagrams and thermodynamic properties of higher order systems in the Al2O3-CaO-FeO-Fe2O3-MgO-MnO-Mn2O3-SiO2-Ti2O3-TiO2 system were well calculated. The database containing the optimized model parameters in this study is compatible with the other FactSage thermodynamic databases and can be used to calculate any unexplored phase diagram and thermodynamic properties within the ten-component system. The database can be used for the complex thermodynamic calculations applicable to pyrometallurgy and advanced ceramics and used for the optimization of industrial processes and the development of new materials. " --
Download or read book A Computational Thermodynamic Model of the Mg Al Y System written by Saher Al Shakhshir and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ternary system Mg-Al-Y was thermodynamically modeled based on the optimization of the binary sub-systems Mg-Al, Mg-Y and Al-Y using the CALPHAD approach. Mg-Al data was taken from the COST507 database, whereas the other two binary subsystems were reoptemised in this work. Liquid phases were described by the Redlich-Kister polynomial model, whereas the intermediate solid solutions were described by the sublattice model. Ternary interaction parameters were introduced to enable the best representation of the experimental data while considering the occurrence of the ternary compound Al4MgY. The constructed database is used to calculate and predict thermodynamic properties, binary phase diagrams of Al-Y and Mg-Y, and liquidus projections of the ternary Mg-Al-Y. The phase diagrams and the thermodynamic properties calculated with the evaluated parameters were in good agreement with the corresponding experimental data from the literature. The predicted invariant points in the Mg-Al-Y system were 16 ternary four-phase-equilibria points; 7 ternary eutectic points, 8 ternary quasi peritectic points, and one ternary peritectic point. Further, 15 ternary three-phase-equilibria points were determined; 8 saddle points, and 7 binary eutectic points.
Download or read book CALPHAD Calculation of Phase Diagrams A Comprehensive Guide written by N. Saunders and published by Elsevier. This book was released on 1998-06-09 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph acts as a benchmark to current achievements in the field of Computer Coupling of Phase Diagrams and Thermochemistry, often called CALPHAD which is an acronym for Computer CALculation of PHAse Diagrams. It also acts as a guide to both the basic background of the subject area and the cutting edge of the topic, combining comprehensive discussions of the underlying physical principles of the CALPHAD method with detailed descriptions of their application to real complex multi-component materials.Approaches which combine both thermodynamic and kinetic models to interpret non-equilibrium phase transformations are also reviewed.
Download or read book Dual phase Materials in the Medium and High Entropy Alloy Systems Al Cr Fe Ni and Al Co Cr Fe Ni written by Ulrike Hecht and published by Frontiers Media SA. This book was released on 2021-08-25 with total page 133 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 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
