Author: Mohammad Asgar KhanPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Thermodynamic Modeling of the Mg-Mn-(Al, Zn) Systems
Author: Mohammad Asgar KhanThermodynamic Modeling and Experimental Investigation of the Al-Cu-Mg-Zn Quaternary System
Author: Haiyan LiangThermodynamic Modeling of the (Mg, Al)-Ca-Zn Systems
Author: Sk. Wasiur RahmanPublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Critical assessment of the experimental data and re-optimization of the binary Mg-Zn, Ca-Zn, Al-Zn, Al-Ca systems and the Laves phase in the Mg-Ca system have been performed. A Comprehensive thermodynamic database of the Mg-Ca-Zn and Al-Ca-Zn ternary systems is presented from the constituent binary systems using suitable extrapolation methods. All available as well as reliable experimental data both for the thermodynamic properties and phase boundaries are reproduced within experimental error limits. In the present assessment, the Modified Quasichemical Model in the pair approximation is used for the liquid phase to account for the presence of the short-range ordering properly. The intermediate solid solutions are modeled using the compound energy formalism. Since the literature included contradicting information regarding the ternary compounds in both ternary systems, thermodynamic modeling of phase equilibria is used to determine the most likely description of the two ternary systems and to exclude the self-contradicting experimental observations. The constructed database is used to calculate both the integral and partial thermodynamic properties of the constituent binary systems. Moreover, the liquidus projections, isothermal sections and vertical sections of the ternary systems are also calculated and the invariant reaction points are predicted using the constructed database.
Phase Diagrams and Thermodynamic Modeling of Solutions
Author: Arthur D. PeltonPublisher: Academic Press
ISBN: 0128016698
Category : Science
Languages : en
Pages : 404
Book Description
Phase Diagrams and Thermodynamic Modeling of Solutions provides readers with an understanding of thermodynamics and phase equilibria that is required to make full and efficient use of these tools. The book systematically discusses phase diagrams of all types, the thermodynamics behind them, their calculations from thermodynamic databases, and the structural models of solutions used in the development of these databases. Featuring examples from a wide range of systems including metals, salts, ceramics, refractories, and concentrated aqueous solutions, Phase Diagrams and Thermodynamic Modeling of Solutions is a vital resource for researchers and developers in materials science, metallurgy, combustion and energy, corrosion engineering, environmental engineering, geology, glass technology, nuclear engineering, and other fields of inorganic chemical and materials science and engineering. Additionally, experts involved in developing thermodynamic databases will find a comprehensive reference text of current solution models. Presents a rigorous and complete development of thermodynamics for readers who already have a basic understanding of chemical thermodynamics Provides an in-depth understanding of phase equilibria Includes information that can be used as a text for graduate courses on thermodynamics and phase diagrams, or on solution modeling Covers several types of phase diagrams (paraequilibrium, solidus projections, first-melting projections, Scheil diagrams, enthalpy diagrams), and more
Critical Evaluation and Thermodynamic Modeling of Mg-RE-X (X
Author: Junghwan KimPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"Magnesium (Mg) alloys are considered as excellent structural materials owing to their light weight along with high specific strength. As for searching new and better Mg alloys, the effect of various alloying elements are currently being investigated. As well as conventional alloying elements like Al, Zn, Mn, etc., rare earth (RE) metals are excellent candidates to enhance the mechanical and chemical properties of Mg alloys. The addition of RE in the casting Mg alloys leads to enhanced strength at both ambient and elevated temperatures. High temperature stable RE compounds are often responsible for the improved creep resistance of the Mg alloys. Recently, the RE addition in the wrought Mg alloys is of great interest in automotive applications because the addition of RE results in weaker and more random textures, which can improve the formability of Mg alloys. The thermodynamic calculations, using thermodynamic database, in the evaluation of existing and potential new Mg alloys are very effective. Accordingly, the development of thermodynamic database of Mg alloys including large amount of alloying species is important to enable the thermodynamic tools to use in many practical applications with regards to Mg alloy development.In the present study, the thermodynamic database for the Mg alloys with RE metals containing Mn, Si, and Sn was developed with a critical evaluation and the optimization of the Mn-RE (13 binary), Si-RE (13 binary), and Sn-RE (13 binary) systems, and several Mg-RE-X (X = Mn, Si, and Sn) (9 ternary) systems. This is part of the development of a large thermodynamic database for the Mg alloys. In the optimizations, the systematic trends and certain similarities were observed in the phase diagrams and thermodynamic properties through the RE series. The systematics was taken into account to complete the optimizations, in particular by the appropriate predictions of the unknown thermodynamic properties. As a result, discrepancies among existing data were successfully resolved during the optimizations, and reliable thermodynamic functions for all the phases in each system were obtained even with the limited amount of experimental data. In addition, key experiments, including phase diagram determinations by differential scanning calorimetry (DSC), and enthalpy of formation measurements by solution calorimetry, were performed for the Mn-Dy system. These experiments enabled to resolve the discrepancies in available experimental data and the lack of thermodynamic information in other Mn-heavy RE systems by the systematic analysis. In the expansion to the ternary systems, the phase diagrams of the Mg-Sn-Nd and Mg-Sn-Gd systems at 500 to 700 oC were determined by the equilibration/quenching method. The existence of the ternary compounds, MgNd(Gd)Sn, MgNd(Gd)Sn2, and Mg4Nd2Sn3 was revealed with the respective phase equilibria. These new ternary phase diagram information were used for the optimization for the Mg-Sn-RE systems.As well as showing the systematics in each binary RE-X system, theoretically, the limitation of the thermodynamic models (Modified quasichemical model vs. Bragg-Williams random mixing model), and the possible reason behind the RE systematics in the enthalpy of formation, the melting temperatures of the RE compounds, etc. were discussed based on the present thermodynamic optimization.Finally, several case studies for Mg alloy evaluation and design were performed to discuss the potential applications of the present optimized thermodynamic database." --
CALPHAD Thermodynamic Modeling for Al-Zn-Mg-Cu Quaternary System with H Metastable Phase Description
Author: Thermodynamic Modeling of the Mg-Al-Sb System
Author: Thevika ThangarajahEssential Readings in Magnesium Technology
Author: Suveen MathaudhuPublisher: Springer
ISBN: 3319480995
Category : Technology & Engineering
Languages : en
Pages : 609
Book Description
This is a compilation of the best papers in the history of Magnesium Technology, a definitive annual reference in the field of magnesium production and related light metals technologies. The volume contains a strong topical mix of application and fundamental research articles on magnesium technology. Section titles: 1.Magnesium Technology History and Overview 2.Electrolytic and Thermal Primary Production 3.Melting, Refining, Recycling, and Life-Cycle Analysis 4.Casting and Solidification 5.Alloy and Microstructural Design 6.Wrought Processing 7.Modeling and Simulation 8.Joining 9.Corrosion, Surface Treatment, and Coating
Thermodynamic Modeling of the Mg-Al-Bi and Mg-Al-Sb Systems
Author: Manas PaliwalThermodynamic Data, Models, and Phase Diagrams in Multicomponent Oxide Systems
Author: Olga FabrichnayaPublisher: Springer Science & Business Media
ISBN: 3662105047
Category : Science
Languages : en
Pages : 216
Book Description
This book involves application of the Calphad method for derivation of a self consistent thermodynamic database for the geologically important system Mg0- Fe0-Fe203-Alz03-Si02 at pressures and temperatures of Earth's upper mantle and the transition zone of that mantle for Earth. The created thermodynamic database reproduces phase relations at 1 bar and at pressures up to 30 GPa. The minerals are modelled by compound energy formalism, which gives realistic descriptions of their Gibbs energy and takes into account crystal structure data. It incorporates a detailed review of diverse types of experimental data which are used to derive the thermodynamic database: phase equilibria, calorimetric stud ies, and thermoelastic property measurements. The book also contains tables of thermodynamic properties at 1 bar (enthalpy and Gibbs energy of formation from the elements, entropy, and heat capacity, and equation of state data at pressures from 1 bar to 30 GPa. Mixing parameters of solid solutions are also provided by the book. Table of Contents Introduction to the Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VII Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IX Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XI Co-Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XIII Vitae of Co-Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XV CODATA Task Group on Geothermodynamic Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XXIII Chapter 1. Thermodynamics and Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1. 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1. 2 Thermodynamic Modeling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1. 3 Experimental Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. 4 Programs and Assessment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 System and Phases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1. 5 Chapter 2. Experimental Phase Equilibrium Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 The Si02 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2. 1 2. 2 The Fe-0 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2. 3 The Fe-Si-0 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2. 4 The Mg0-Si0 System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .