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Solidification Behavior of Dy-Tb-Fe Alloys through Experimental Study and Thermodynamic Calculation
Cong Tan1, Qi Wei1, Weifeng Cheng1
1Guangxi Key Laboratory of Information Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
Materials (Basel, Switzerland)
|July 14, 2023
Summary
This study investigated Dy-Tb-Fe alloys, finding no stable ternary compounds. Thermodynamic calculations accurately predicted alloy solidification behavior, yielding reliable system parameters.
Area of Science:
- Materials Science
- Metallurgy
- Thermodynamics
Background:
- Understanding phase transitions and solidification is crucial for alloy development.
- Dysprosium-Terbium-Iron (Dy-Tb-Fe) alloys have potential applications requiring precise phase behavior knowledge.
Purpose of the Study:
- To investigate the solidification microstructure and phase transitions of Dy-Tb-Fe alloys.
- To establish the phase equilibria of the Dy-Tb-Fe system using CALPHAD.
- To analyze the solidification behavior using thermodynamic modeling.
Main Methods:
- Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS) for microstructure analysis.
- X-ray Diffraction (XRD) for phase identification.
- Differential Thermal Analysis (DTA) for phase transformation temperatures.
- CALPHAD (Calculation of Phase Diagrams) method for phase equilibria.
- Gulliver-Scheil non-equilibrium model for solidification simulation.
Main Results:
- No stable ternary Dy-Tb-Fe compound was detected experimentally.
- Phase transformation temperatures for eight Dy-Tb-Fe alloys were measured.
- CALPHAD calculations of phase equilibria showed good agreement with experimental data.
- Thermodynamic modeling accurately predicted the solidification behavior of Dy-Tb-Fe alloys.
Conclusions:
- The study provides reliable thermodynamic parameters for the Dy-Tb-Fe system.
- Experimental and computational methods validated each other for understanding alloy behavior.
- The findings contribute to the accurate prediction and design of Dy-Tb-Fe based materials.
