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Provision and Use of Thermodynamic Data for the Solution of High-Temperature Practical Problems
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TLDR
In this paper, a review of the current position in the calculation of phase equilibria for multicomponent alloy systems, employing data from binary systems is given, and the storage of data in computer data banks is discussed and the particular NPL data bank which stores metallurgical thermodynamic data is described.Abstract:
When chemical thermodynamic calculations are applied to the evaluation of· metallurgical processes, it is essential that reliable data are used in order to reach valid conclusions. The compilation of such data from raw experimental results which are reported in the literature is a highly skilled operation. All aspects of the skills involved are described in the present article, including available methods for estimating unknown data. It is desirable that fully self-consistent data should include reliable phase diagram information when available, and the relationships between thermodynamic data and phase equilibria are described. A review is given of the current position in the calculation of phase equilibria for multicomponent alloy systems, employing data from binary systems. The storage of data in computer data banks is discussed and the particular NPL data bank which stores metallurgical thermodynamic data is described. Finally, a review of recent examples in which thermodynamic calculations h...read more
Citations
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Crystallographic texture of stress-affected bainite
TL;DR: In this paper, a method is presented for calculating both the macroscopic strains and the crystallographic bias which develop when a polycrystalline sample of austenitic steel is transformed into bainite or martensite under the influence of an applied stress or a system of stresses.
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Proceedings of the fourth calphad meeting Workshop on computer based coupling of thermochemical and phase diagram data held 18–22 August 1975 at the National Bureau of Standards, Gaithersburg, Maryland☆
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Calculation of quasibinary and quasiternary oxyntiride systems-IV☆☆☆
TL;DR: In this paper, a data base is developed for calculation of quasi-binary and quasi-ternary phase diagrams of ceramic systems (1, 3) for lattice stability, solution and compound phase parameters.
Journal ArticleDOI
High entropy alloys
TL;DR: This issue of Materials Science and Technology is going to be seminal in defining the way forward for the so-called high entropy alloys (HEAs), and identified and invited as many of the people involved in HEA research as the databases listed.
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Thermodynamic properties of melts in Al–TI(Zr, Hf) binary systems
TL;DR: In this article, the thermodynamic properties of Al-Ti(Zr, Hf) binary melts were examined by isoperibolic calorimetry at 1770 ± 5 K and 1790 ± 5 k.
References
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Journal ArticleDOI
A simplex method for function minimization
John A. Nelder,R. Mead +1 more
TL;DR: A method is described for the minimization of a function of n variables, which depends on the comparison of function values at the (n 41) vertices of a general simplex, followed by the replacement of the vertex with the highest value by another point.
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Ionicity of the Chemical Bond in Crystals
TL;DR: The role of quantum-mechanical sum rules and spectral moments in constructing simplified models of bond and band behavior is explored in this article, where a wide range of physical properties including crystal structure, energy bands, elastic constants, ionization energies, and impurity states are discussed.
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Electronegativities of the Elements
TL;DR: In this paper, a chart is given which shows a systematic relation of electronegativity to the periodic system of the elements, and a linear relationship is found between electrone gativity and the work function of metals.
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The electronegativity parameter for transition metals: Heat of formation and charge transfer in alloys
TL;DR: In this article, it is shown that the work function of a metal is proportional to the chemical potential for electrons in Wigner-Seitz atomic cells; the proportionality factor is found to be about 1·4.
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Bond susceptibilities and ionicities in complex crystal structures
TL;DR: The concept of crystal ionicity has proved to be a useful unifying concept for understanding chemical trends in diverse problems in chemistry and solid state physics as discussed by the authors, and the applicability of this PV dielectric analysis has been limited to only the simple AN B8•N compounds which contain only one type of bond.