Xuping Su

The 450 °C Isothermal Section of the Zn-Bi-Ni System

The isothermal section of the Zn-Bi-Ni ternary system at 450xa0°C was determined experimentally using the equilibrated alloys approach. The specimens were investigated by means of optical microscopy, scanning electron microscopic/energy-dispersive spectrometric analysis and x-ray diffraction. Six three-phase regions exist in this isothermal section. The L-Bi phase is in equilibrium with all phases of Ni-Zn binary system except the α-Ni phase. Experimental results indicate that the third element, Zn or Bi, is almost insoluble in the Bi-Ni or Ni-Zn intermetallic compounds.

The Zn-Rich Corner of the Zn-Fe-Al-Sb Quaternary System at 450 °C

The 450xa0°C isothermal section of the Zn-Fe-Al-Sb quaternary system with Zn fixed at 93xa0at.% has been studied experimentally using x-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy. The (Lxa0+xa0AlSb) field is in equilibrium with other phase fields in the section, except those near the 93Zn7Fe corner. The solubility of Sb in ζ, δ, T, Fe2Al5, and FeAl3 phases is very limited. The Zn-Fe-Al ternary phase T (Al6Fe8Zn86) was found to be in equilibrium with L, δ, Fe2Al5, and AlSb phase. The maximum solubilities of Zn in AlSb, Fe2Al5, and FeAl3 are 5.3, 12.3, and 6.2xa0at.% respectively. Zn can be dissolved in all compounds existing in the equilibrium alloys. Five four-phase regions and four three-phase regions have been confirmed experimentally.

Thermodynamic assessment of the Ag-Ce (silver-cerium) system

Abstract An optimized thermodynamic description of the Ag–Ce system has been obtained from experimental thermodynamic and phase diagram data by means of the computer program THERMO-CALC based on the least-squares method, using models for the Gibbs energy of individual phases. The Ag–Ce system contains four intermetallic compounds. The calculated standard enthalpies of formation of AgCe, Ag 2 Ce, Ag 51 Ce 14 and Ag 4 Ce are −22.331, −20.194, −18.998, −17.863 kJ/mol, respectively. The calculated values and experimental data are in good agreement

On the thermodynamic assessment of the Ag–La system

Abstract The phase diagram and thermodynamic data of the Ag–La system were critically assessed by means of the computer programs THERMO-CALC, using models for the Gibbs energies of individual phases. The system contains four intermetallic compounds. Good agreement is obtained between the calculation and experimental results.

On thermodynamic assessment of the Ag–Pr system

Abstract Optimized descriptions of the phase diagram and thermodynamic properties of the Ag–Pr system have been obtained from experimental thermodynamic and phase diagram data by means of the computer program thermo-calc based on the least squares method, using models for the Gibbs energy of individual phases. The system contains four intermetallic compounds. The calculated standard enthalpies of formation of AgPr, Ag 2 Pr, Ag 51 Pr 14 and Ag 5 Pr are −23.580 kJ/mol, −22.132 kJ/mol, −21.246 kJ/mol and −21.393 kJ/mol, respectively. A consistent set of thermodynamic parameters was derived. Optimized and experimental data are in good agreement.

The 450 °C isothermal section of the Zn-Al-Mo phase diagram

The 450 °C isothermal section of the Zn-Al-Mo phase diagram has been determined experimentally using scanning electron microscopy (SEM) coupled with energy dispersive x-ray spectroscopy and x-ray diffractometry. The focus of the work is the Zn-rich corner due to its relevance to galvanizing. The present study indicates that with the increasing Al content of alloys, the liquid phase is successively in equilibrium with the ternary extensions of intermetallic compounds of MoZn22, MoZn7, AlMo3, and Al8Mo3.