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Thermodynamic calculation of phase equilibria in the Bi–Mg–Zn ternary system

  • Chunju Niu and Changrong Li
Published/Copyright: June 3, 2019
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 110 Issue 6

Abstract

On the basis of the experimental phase equilibria of the Bi–Mg–Zn ternary system, the thermodynamic assessment of the Bi–Mg–Zn ternary system was carried out by means of the CALPHAD (CALculation of PHAse Diagram) technique. The Gibbs free energies of the solid solution phases (Rhombohedral_A7, Hcp_A3 and Hcp_Zn) were described by the substitutional solution model, and that of the liquid phase was described by the associate model with the constituent species Bi, Bi2Mg3, Mg and Zn. The non-stoichiometric compound, α-Bi2Mg3 as well as its high temperature allotrope β-Bi2Mg3 were described by the sublattice models, (Bi,Zn,Va)2(Mg,Zn)3 and (Bi,Zn)1(Bi,Zn,Va)3(Mg,Zn)6, respectively. In order to obtain a set of self-consistent thermodynamic data, the thermodynamic parameters of the phases, including liquid, α-Bi2Mg3 and β-Bi2Mg3, of the Bi–Mg–Zn ternary system were optimized while the thermodynamic data of other phases were adopted directly from the literature reports of the constituent binary systems. With this newly developed thermodynamic database, the CALPHAD results can well reproduce the experimental phase diagram information of the Bi–Mg–Zn ternary system. The solidification processes of a typical Bi–Mg–Zn alloy are calculated and analyzed using the phase equilibrium approach and the Gulliver–Scheil model in comparison with the experimental investigation.

Keywords: Bi–Mg–Zn; CALPHAD technique; Thermodynamic calculation; Phase diagram; Mg-based alloys
∗Correspondence address: Chunju Niu, School of Mechanical and Electrical Engineering, University of Heze, Heze Shandong 274015, P.R. China, e-mail:
∗∗Correspondence address: Changrong Li, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, P.R. China, e-mail:

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Received: 2018-10-18
Accepted: 2019-01-22
Published Online: 2019-06-03
Published in Print: 2019-06-12

© 2019, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111774
Keywords for this article
Bi–Mg–Zn; CALPHAD technique; Thermodynamic calculation; Phase diagram; Mg-based alloys

Articles in the same Issue

  1. Original Contributions
  2. Experimental investigation of gas/slag/matte/tridymite equilibria in the Cu–Fe–O–S–Si system in controlled gas atmosphere at T = 1 200 °C and P(SO2) = 0.1 atm
  3. Thermodynamic calculation of phase equilibria in the Bi–Mg–Zn ternary system
  4. Effect of pre-rafting on creep properties of Ni-based single crystal superalloy
  5. Effect of thermomechanical treatment on the microstructures and mechanical properties of an ultrafine grained steel using bainite starting microstructure
  6. Deformation response and microstructural evolution of as-cast Mg alloys AM30 and AM50 during hot compression
  7. Effects of graphene nanoplatelets on the tribological, mechanical, and thermal properties of Mg-3Al alloy nanocomposites
  8. Increasing cold workability of Ti-6Al-4V alloy via thermo-mechanical processing: simulation and experiment
  9. Synthesis, characterization, and possible application as sorbents of new low-cost aluminosilicate materials with different Si/Al ratios
  10. Self-assembly of Pd@Au core/shell nanosheets used as a highly sensitive SERS substrate based on the determination of trace fluorescent dye
  11. Short Communications
  12. On the material characteristics of a high carbon cast austenitic stainless steel after solution annealing followed by quenching in a CNT nanofluid
  13. Influence of in-situ Al2O3 content on mechanical properties of Al2O3 reinforced Fe–Cr–Ni alloys
  14. Novel synthesis of Ti2SC powder using FeS2 as a sulphur source
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