Phase Equilibria, Thermodynamics and Solidified Microstructure in the Copper-Zirconium-Yttrium System.
Fengting Jing1, Yuling Liu1, Yong Du1
1State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|March 11, 2023
Summary
This study investigates the copper-zirconium-yttrium (Cu-Zr-Y) system, crucial for designing high strength and high conductivity (HSHC) copper alloys. Thermodynamic modeling and experimental data establish phase equilibria, aiding HSHC alloy development.
Area of Science:
- Materials Science
- Metallurgy
- Thermodynamics
Background:
- Copper alloys with zirconium and yttrium are attractive for high strength and high conductivity (HSHC) applications.
- Understanding the Cu-Zr-Y ternary system is vital for designing advanced HSHC copper alloys.
Purpose of the Study:
- To investigate the solidified microstructure, thermodynamics, and phase equilibria in the ternary Cu-Zr-Y system.
- To provide new insights for designing HSHC copper alloys.
Main Methods:
- Experimental studies using X-ray diffraction (XRD), electron probe microanalysis (EPMA), and differential scanning calorimetry (DSC).
- Construction of the isothermal section at 973 K.
- Thermodynamic assessment using the CALPHAD (CALculation of PHAse diagrams) method.
Main Results:
- No ternary compound was identified in the Cu-Zr-Y system.
- Several binary phases, including Cu6Y, Cu4Y, Cu7Y2, Cu5Zr, Cu51Zr14, and CuZr, extended significantly into the ternary system.
- Calculated isothermal sections, vertical section, and liquidus projection using the thermodynamic description showed good agreement with experimental data.
Conclusions:
- A thermodynamic description for the Cu-Zr-Y system was established.
- The findings contribute to the rational design of copper alloys with desired microstructures for HSHC applications.
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