scholarly journals Experimental and thermodynamic description of ternary Bi-Cu-Ga system

2017 ◽  
Vol 53 (3) ◽  
pp. 189-201 ◽  
Author(s):  
D. Minic ◽  
Y. Du ◽  
M. Premovic ◽  
D. Manasijevic ◽  
N. Talijan ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Ternary Phase ◽  
Energy Dispersive Spectrometry ◽  
Thermodynamic Description ◽  
Calculated Phase Diagram ◽  
Calphad Method ◽  
Experimental Result ◽  
Liquidus Phase ◽  
Ternary Phase Diagrams ◽  
Good Agreement

Phase diagram of the Bi-Cu-Ga ternary system has been investigated experimentally with 27 alloys and analytically by using a Calphad method. Thirteen annealed alloys at 200?C were investigated by using scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), and X-ray powder diffraction (XRD) methods. Temperatures of phase transformation were determined with 14 alloys which are lying along three vertical sections Bi-Cu0.5Ga0.5, Cu-Bi0.5Ga0.5 and Ga-Bi0.5Cu0.5 by using differential thermal analysis (DTA). Based on the experimental result and by using Calphad method, ternary phase diagrams were constructed with a new description of liquidus phase. Calculated phase diagram and experimentally obtained results are in good agreement. Liquidus projection and invariant reaction were calculated by using new thermodynamic parameters for liquidus phase.

Calphad description of the Ge-Mn system

2014 ◽  
Vol 1642 ◽  
Author(s):  
Alexandre Berche ◽  
Jean-Claude Tédenac ◽  
Philippe Jund ◽  
Stéphane Gorsse
Keyword(s):  
Phase Diagram ◽  
Liquid Phase ◽  
Thermodynamic Properties ◽  
Gibbs Energy ◽  
Critical Review ◽  
Thermodynamic Description ◽  
Calphad Method ◽  
Review Of The Literature ◽  
Solid Phases

ABSTRACTThe germanium-manganese system has been experimentally studied but no Calphad description is available yet. After a critical review of the literature concerning the phase diagram and the thermodynamic properties, a thermodynamic description of the Gibbs energy of the phases is performed using the Calphad method. The liquid phase is described with an associated model and the variation to the stoichiometry of the solid phases is taken into account.

scholarly journals Experimental investigation and thermodynamic calculations of the Bi-Ni-Pb phase diagram

2019 ◽  
Vol 55 (2) ◽  
pp. 157-166 ◽  
Author(s):  
D. Minic ◽  
M. Premovic ◽  
N. Toskovic ◽  
D. Manasijevic ◽  
V. Cosovic ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Close Agreement ◽  
Binary Systems ◽  
Energy Dispersive Spectrometry ◽  
Calculated Phase Diagram ◽  
Xrd Analysis ◽  
Ternary Alloys ◽  
Isothermal Sections ◽  
X Ray ◽  
Scanning Electron

The article presents an experimental study of a phase diagram of a ternary Bi-Ni-Pb system using differential thermal analysis (DTA), scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), and X-ray powder diffraction (XRD) analysis. The investigated ternary alloys were selected from three vertical sections (x(Bi)=0.75, x(Ni)=0.1 and x(Pb)=0.9) and two isothermal sections at 100 and at 300?C. The obtained experimental results were compared with the thermodynamically extrapolated phase diagram of the Bi-Ni-Pb ternary system based on the thermodynamic parameters for the constitutive binary systems available in literature. Reasonably close agreement between the experimental data and the calculated phase diagram was obtained.

New-Type Co-Based Superalloys Designed by CALPHAD Method

2015 ◽  
Vol 816 ◽  
pp. 578-580 ◽  
Author(s):  
Shu Yu Yang ◽  
Min Jiang ◽  
Lei Wang
Keyword(s):  
Phase Diagram ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Calculated Phase Diagram ◽  
Calphad Method ◽  
Two Phase ◽  
Calculated Phase ◽  
New Type

The phase equilibria of new-type Co-based superalloys which include the system of Co-Al-W were studied by CALPHAD method. It was shown that γ+γ' two-phase regions were existed in the calculated phase diagrams. The compositions of new-type Co-based superalloys which can obtain γ+γ' microstructures were predicted due to the calculated phase diagram. The mole fractions of the constituent phases of Co-Al-W-Ni-Cr alloys were calculated. The temperature of γ' phase began to precipitate at about 1050°C.

Substitution Behavior of Ni3X-type Compounds with D0a Structure

2011 ◽  
Vol 1295 ◽  
Author(s):  
H. Sugimura ◽  
Y. Kaneno ◽  
T. Takasugi
Keyword(s):  
Thermodynamic Model ◽  
Ternary Phase ◽  
Single Phase ◽  
Heat Of Formation ◽  
Phase Region ◽  
Site Preference ◽  
Ternary Phase Diagrams ◽  
Host Compound ◽  
Ternary Additions ◽  
Good Agreement

ABSTRACTThe site preference of ternary additions in GCP (geometrically close-packed) Ni3X-type compounds with D0a structure was determined from the direction of the single-phase region of the D0a phase in the reported ternary phase diagrams. The thermodynamic model based on the Bragg-Williams approximation, which is based on the change in heat of formation of the host compound by a small addition of ternary solute, was applied to predict the site preference of ternary additions. The heat of formation used in the thermodynamic calculation was derived from Miedema’s formula. Good agreement was obtained between the thermodynamic model and the result of the literature search.

A new 1 : 1 cocrystal of lamotrigine and 1,2,3,6-hydrophthalimide: discovery, characterization, and construction of ternary phase diagrams

CrystEngComm ◽  
2020 ◽  
Vol 22 (15) ◽  
pp. 2681-2688
Author(s):  
Wenjie Kuang ◽  
Shaochang Ji ◽  
Yufeng Wei ◽  
Jinyan Zhang ◽  
Ping Lan
Keyword(s):  
Phase Diagram ◽  
Phase Diagrams ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
Ternary Phase Diagrams

A 1 : 1 cocrystal of lamotrigine (LAM) with 1,2,3,6-tetrahydrophthalimide (HPHT) was first successfully synthesized. The ternary phase diagram of the cocrystal was constructed, and its stability and dissolution were determined.

scholarly journals Prediction of phase equilibria in the In-Sb-Pb system

2008 ◽  
Vol 73 (3) ◽  
pp. 377-384
Author(s):  
Dusko Minic ◽  
Dragan Manasijevic ◽  
Dragana Zivkovic ◽  
Nada Strbac ◽  
Zvonimir Stankovic
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Phase Equilibria ◽  
Binary Systems ◽  
Equilibrium Phase ◽  
Calculated Phase Diagram ◽  
Equilibrium Phase Diagram ◽  
Thermodynamic Prediction ◽  
Calculated Liquidus ◽  
Good Agreement

Binary thermodynamic data, successfully used for phase diagram calculations of the binary systems In-Sb, Pb-Sb and In-Pb, were used for the prediction of the phase equilibria in the ternary In-Sb-Pb system. The predicted equilibrium phase diagram of the vertical Pb-InSb section was compared with the results of differential thermal analysis (DTA) and optical microscopy. The calculated phase diagram of the isothermal section at 300 ?C was compared with the experimentally (SEM, EDX) determined composition of phases in the chosen alloys after annealing. Very good agreement between the binary-based thermodynamic prediction and the experimental data was found in all cases. The calculated liquidus projection of the ternary In-Sb-Pb system is also presented.

Thermodynamic Evaluation and Assessment of the Ti-U Binary System

2012 ◽  
Vol 187 ◽  
pp. 272-277 ◽  
Author(s):  
Zhan Min Cao ◽  
Kun Peng Wang ◽  
Guang Wei Du ◽  
Zhi Yu Qiao
Keyword(s):  
Phase Diagram ◽  
Binary System ◽  
Thermodynamic Description ◽  
Phase Diagram Data ◽  
Thermodynamic Evaluation ◽  
Miedema Model ◽  
Experimental Phase ◽  
Experimental Phase Diagram ◽  
Thermo Calc Software ◽  
Good Agreement

The thermodynamic description of the Ti-U binary system is obtained by the CALPHAD method using Thermo-Calc software and based on the estimated thermodynamic properties using ion-bonding model and Miedema model as well as the experimental phase diagram information. The liquid, αU, βU, δTi, and γ phases are assumed to be substitutional solutions with Redlich-Kister formula for the expressions of their excess Gibbs energy. The intermetallic compound TiU2 is treated as a stoichiometric compound. The calculated phase equlibria are in good agreement with the estimated and available experimental phase diagram data.

Thermodynamic descriptions of the Cu–Zn system

2008 ◽  
Vol 23 (1) ◽  
pp. 258-263 ◽  
Author(s):  
Wojciech Gierlotka ◽  
Sinn-wen Chen
Keyword(s):  
Phase Diagram ◽  
Liquid Phase ◽  
Thermodynamic Properties ◽  
Alloy System ◽  
Experimental Information ◽  
Calphad Method ◽  
Body Centered Cubic ◽  
Binary Alloy System ◽  
Bcc Phase ◽  
Good Agreement

Cu–Zn is an important binary alloy system. In the interested temperature range from 300 to 1500 K, there are eight phases, liquid, Cu, β, β′, γ, δ, ϵ, and Zn phases. The thermodynamic descriptions of the Cu–Zn system are reassessed using the CALPHAD method. A new description of liquid phase and simplified description of body-centered cubic (bcc) phase are proposed. Good agreement has been found among the calculated thermodynamic properties, phase diagram, and the experimental information.

scholarly journals DTA measurements in the ternary Ag-Au-Ga system

2020 ◽  
pp. 21-21
Author(s):  
Dominika Jendrzejczyk-Handzlik ◽  
Piotr Handzlik
Keyword(s):  
Experimental Data ◽  
Thermal Analysis ◽  
Phase Diagram ◽  
Differential Thermal Analysis ◽  
Phase Transformations ◽  
Cross Sections ◽  
Calphad Method ◽  
Experimental Results ◽  
Zero Rate ◽  
Good Agreement

In this work, the ternary Ag-Au-Ga system was studied experimentally by differential thermal analysis (DTA). Measurements were carried out along two chosen cross-sections determined by the ratio of mole fractions XAg/XGa=1:1 and XAu/XGa=1:1 by applying Pegasus 404 apparatus form Netzsch. Experiments were performed at three rates: 1 K min-1, 5 K min-1 and 10 K min-1. Next, the obtained experimental results were used to estimate the temperatures of liquidus by applying extrapolation to zero rate. Moreover, the temperatures of invariant reactions and other phase transformations were investigated from DTA measurements which were carried out with the rate 1 K min-1. Finally, the experimental results were compared with the isopleths obtained from prediction and calculation of the phase diagram which were done by using CALPHAD method. Experimental data obtained in this work are in good agreement with the results of calculation.

scholarly journals Size-dependent thermodynamic description of the binary Pb-Sn system

2017 ◽  
Vol 53 (3) ◽  
pp. 233-238
Author(s):  
W. Gierlotka
Keyword(s):  
Phase Diagram ◽  
Thermodynamic Description ◽  
Literature Information ◽  
Size Dependent ◽  
Gibbs Energies ◽  
Proposed Model ◽  
Extended Thermodynamic ◽  
Size Of Particles ◽  
Good Agreement

Recently, a new thermodynamic description of the binary Pb - Sn system was proposed and it seems to be interesting to extend this description on the system, where size of particles plays a key-role. To obtain this goal a set of surface Gibbs energies was calculated and added to Gibbs energies describing bulk phases. The extended thermodynamic description was used for calculation of size-dependent phase diagram of binary Pb-Sn system. Comparison of calculation with limited literature information allows for statement that the proposed model is in good agreement with experiment.

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