Download or read book Thermodynamic and Solidification Modeling Coupled with Experimental Investigation of the Multicomponent Aluminum Alloys written by Xinyan Yan and published by . This book was released on 2001 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book THERMEC 2006 written by Tara Chandra and published by Trans Tech Publications Ltd. This book was released on 2007-03-15 with total page 5180 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present set of volumes comprises selected papers from the 5th International Conference on the Processing and Manufacturing of Advanced Materials THERMEC2006 - held from July 4-8, 2006 in Vancouver, Canada.
Download or read book Solidification Modeling and Experimental Investigation of Al rich Al Cu Mg Zn Alloys written by Fanyou Xie and published by . This book was released on 1999 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamic Modeling and Experimental Study of the Al Cr Cu Fe Mg Mn Si System written by Senlin Cui and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Aluminum alloys are extensively used in civil engineering, ship building, automotive, and aerospace industry. The requirement of improving fuel efficiency and weight reduction of vehicle triggers a resurgence of research of aluminum in automobile industry. Al 6xxx series alloys are commonly utilized as extruded materials because of their high strength, formability and ductility, weldability, corrosion resistance, and low cost. The whole chain of Al alloy component manufacturing starts from aluminum melt refining, to casting, homogenization, rolling/extrusion, and finally heat treatment. The microstructure evolution of Al alloys is controlled by both thermodynamics and kinetics. The driving forces for each processing step basically include the chemical driving force or thermodynamic driving force, the interfacial energy, the mechanical driving force, etc. Thermodynamics related to chemical reactions and phase transformations is thus of fundamental importance.The study of thermochemical properties and phase diagram of Al alloys is helpful for new Al alloy composition design and process optimization. The CALPHAD (CALculation of PHAse Diagram) approach is one of the most efficient ways to study alloy thermodynamics systematically. With a well-developed Al alloy thermodynamic database, the phase equilibria and thermodynamic properties can be calculated for complex alloy systems. As a cornerstone for the understanding of various phenomena in Al 6xxx alloys, the current work focuses on the development of a thermodynamic database for the Al-Cr-Cu-Fe-Mg-Mn-Si system via a coupled experimental and thermodynamic modeling approach. Isothermal sections in the Al rich corner of the Al-Cr-Mg system were measured at 400, 450, and 500 °C via equilibrated alloys, diffusion couples, and differential thermal analysis (DSC). The thermodynamic optimizations of the binary Al-Cr, Cu-Cr, Cu-Mg, Cr-Si, and Fe-Si systems were newly performed, and the thermodynamic descriptions of the Al-Mn, Cu-Mn, Cr-Fe, Cr-Mg, and Cr-Mn systems were revised. The ternary Al-Cu-Cr, Al-Cu-Mg, Al-Cu-Si, Al-Cr-Mg, Al-Cr-Mn, Al-Cr-Si, Cu-Fe-Cr, Cu-Fe-Mn, Cu-Mg-Si, Cr-Fe-Si, and Fe-Mg-Si systems were thermodynamically modeled, and the Al-Cu-Mn system was revised. Moreover, the quaternary Al-Cu-Mg-Si system was remodeled. The optimization or revision of the thermodynamic descriptions of all the systems were based on the current experimental results and the critically evaluated literature data including phase diagram, enthalpy of mixing, activity, Gibbs energy of formation, enthalpy of formation, standard entropy, heat capacity, etc. The liquid phase was described using the Modified Quasi-chemical Model (MQM) in pair approximation, and the Compound Energy Formalism (CEF) was utilized for the descriptions of all the solid phases. The order-disorder transitions (bcc_A2/bcc_B2 transition and bcc_B2/bcc_D03 transition) were modeled using the split compound energy formalism. A self-consistent set of thermodynamic description for the Al-Cr-Cu-Fe-Mg-Mn-Si system was obtained by combining the currently assessed thermodynamic parameters with the thermodynamic parameters available in the literature. The obtained thermodynamic database was applied to investigate the recycling of Al alloys. The effect of each major and impurity alloying element on the types of precipitates and their amounts in both the solidification and equilibrium conditions were also systematically investigated for the Al 6xxx series alloys using the thermodynamic calculations with the present new database." --
Download or read book Casting Design and Performance written by and published by ASM International. This book was released on 2009 with total page 271 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solidification of Aluminum Alloys written by Men G. Chu and published by Wiley-TMS. This book was released on 2004-03 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume addresses progress in the application of solidificationprinciples to the production of aluminum alloys. Topics includemicrostructure evolution, phase formation and solidification pathanalysis, grain refinement, micro/macro-segregation, mechanicalbehavior/properties in the mushy state, solidificationcracking/tearing, gas/shrinkage porosity formation, effect ofimpurities/trace elements, and the impact of cast structure on thesubsequent fabrication and properties of finished products. Paperson the experimental or theoretical simulation of solidificationaspects of casting processes including direct chill casting,continuous casting, shaped casting, semi-solid processing, andother advanced casting technologies are also included, as well asexamples showing the use of solidification principles to solveindustrial problems. From ahref="http://www.tms.org/Meetings/Annual-04/AnnMtg04Home.html"target="_blank"2004 TMS Annual Meeting/a to be held inCharlotte, North Carolina, March 14 - 18, 2004.
Download or read book Multicomponent Phase Diagrams Applications for Commercial Aluminum Alloys written by Nikolay A. Belov and published by Elsevier. This book was released on 2005-07-01 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite decades of extensive research and application, commercial aluminum alloys are still poorly understood in terms of the phase composition and phase transformations occurring during solidification, cooling, and heating. Multicomponent Phase Diagrams: Applications for Commercial Aluminum Alloys aims to apply multi-component phase diagrams to commercial aluminum alloys, and give a comprehensive coverage of available and assessed phase diagrams for aluminum-based alloy systems of different dimensionality. - Features data on non-equilibrium phase diagrams, which can rarely be obtained from other publications - Extensive coverage of all groups of commercially important alloys and materials
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2000 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamic Modeling and Experimental Investigation of the Aluminum iron magnesium silicon Quaternary Alloy System written by Stephen Lynn Daniel and published by . This book was released on 2001 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Phase field simulations of multi component solidification and coarsening based on thermodynamic datasets written by Schulz, Sebastian and published by KIT Scientific Publishing. This book was released on 2017-02-22 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: The utilization of thermodynamic and mobility data plays a major role in phase-field modeling. This work discusses different formulations for the thermodynamic quantities of a grand potential model along with practices to determine parameters from datasets. The framework is used to study solidification of Al-Si-Mg for a variation of composition, diffusivities and surface energy anisotropies. To verify the simulations, they are compared with solidification theories.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2001 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shape Casting of Metals written by Murat Tiryakioḡlu and published by Wiley-TMS. This book was released on 2005-02 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shape Casting of Metals, the proceedings from the symposium held to honor John Campbell for his contributions to the metal casting field, focuses on such topics as: Casting process design and characterization for improved structural quality and reliability, Process-structure-property-performance interrelationships in cast metals, Feeding and gating system design, Shape casting process modeling and improvement, and Molten metal quality and its effect on casting reliability. From the 2005 TMS Annual Meeting held in San Francisco, California, February 13 - 17, 2005.
Download or read book Microsegregation of Copper in Aluminium Casting Alloys written by Jae-Ik Cho and published by . This book was released on 2003 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamic Description of Multicomponent Ni base Superalloys Containing Al Cr Ru and Pt written by Jun Zhu and published by . This book was released on 2008 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Use of Computerized Thermodynamics Databases for Solidification Modeling of Fusion Welds in Multi Component Alloys written by and published by . This book was released on 1999 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most engineering alloys contain numerous alloying elements and their solidification behavior can not typically be modeled with existing binary and ternary phase diagrams. There has recently been considerable progress in the development of thermodynamic software programs for calculating solidification parameters and phase diagrams of multi-component systems. These routines can potentially provide useful input data that are needed in multi-component solidification models. However, these thermodynamic routines require validation before they can be confidently applied to simulations of alloys over a wide range of composition. In this article, a preliminary assessment of the accuracy of the Thermo-Calc NiFe Superalloy database is presented. The database validation is conducted by comparing calculated phase diagram quantities to experimental measurements available in the literature. Comparisons are provided in terms of calculated and measured liquidus and solidus temperatures and slopes, equilibrium distribution coefficients, and multi-component phase diagrams. Reasonable agreement is observed among the comparisons made to date. Examples are provided which illustrate how the database can be used to approximate the solidification sequence and final segregation patterns in multi-component alloys. An additional example of the coupling of calculated phase diagrams to solute redistribution computations in a commercial eight component Ni base superalloy is also presented.
Download or read book Computational Materials System Design written by Dongwon Shin and published by Springer. This book was released on 2017-11-10 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides state-of-the-art computational approaches for accelerating materials discovery, synthesis, and processing using thermodynamics and kinetics. The authors deliver an overview of current practical computational tools for materials design in the field. They describe ways to integrate thermodynamics and kinetics and how the two can supplement each other.
Download or read book Application of Rapid Solidification Techniques to Aluminum Alloys written by C. G. Lebi and published by . This book was released on 1978 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This portion of the program was conducted for the purpose of developing a predictive model of heat flow and solidification for aluminum alloys produced under the high cooling rate conditions achievable in atomization processes. It is a combined experimental and theoretical study of the relationship between the important solidification variables (e.g. cooling rate, temperature gradients, interface shape and velocity, supercooling and transformation kinetics) and the structure of rapidly solidified aluminum alloy powders. This report covers that portion of the investigations which addressed the characterization of the thermal history of rapid solidification in metal droplets, and its effects on powder microstructure. The main effort was focused on modelling the heat flow during solidification, and relationships were established between the atomization parameters, the growth kinetics, the interface velocity and undercooling, and other important variables. Numerical solutions based on the enthalpy model were developed, and their results compared to the trends predicted from the Newtonian model. The analysis covered situations of isothermal solidification at the melting temperature, as well as those where significant undercoolings are necessary for nucleation and growth. The implications of single vs. multiple nucleation were also discussed. The concepts developed from the heat flow analysis were coupled to microstructural observations in Aluminum alloy powders, mostly in the submicron size range. It was shown that reducing the particle size decreases the extent of segregation, promotes multiple nucleation and the formation of twins during solidification.
