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Structure and Properties of Strontium-Modified Zn-Al-Cu Alloys
Mariusz Krupiński1, Krzysztof Labisz2, Beata Krupińska1
1Faculty of Mechanical Engineering, Silesian University of Technology, Konarskiego Str. 18a, 44-100 Gliwice, Poland.
Materials (Basel, Switzerland)
|February 26, 2025
Summary
Adding strontium (Sr) to zinc-aluminum-copper (Zn-Al-Cu) alloys enhances hardness and wear resistance. This modification introduces new intermetallic phases, improving alloy performance for various applications.
Area of Science:
- Materials Science
- Metallurgy
- Alloy Development
Background:
- Non-ferrous alloys' functionality is enhanced through chemical composition modification.
- Hypereutectic Zn-Al-Cu alloys are critical in various industrial applications.
- Optimizing alloy properties requires understanding the impact of specific elemental additions.
Purpose of the Study:
- To investigate the effect of strontium (Sr) addition on Zn-Al-Cu alloys.
- To analyze the influence of Sr on crystallization kinetics, microstructure, hardness, and abrasive wear resistance.
- To evaluate the impact of Sr modification on the corrosion resistance of these alloys.
Main Methods:
- Microstructural analysis using Optical Microscopy, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM).
- Thermo-derivative analysis (TDA) to study crystallization kinetics.
- Mechanical property testing including hardness and abrasive wear resistance measurements.
Main Results:
- Strontium addition resulted in the formation of primary Al2Sr and secondary Zn13Sr and Al4Sr intermetallic phases.
- The presence of these Sr-containing intermetallic phases significantly increased alloy hardness by approximately 20%.
- Abrasive wear resistance was improved by approximately 7.5% due to Sr modification.
Conclusions:
- Strontium is an effective modifier for hypereutectic Zn-Al-Cu alloys.
- The formation of specific intermetallic phases is responsible for the observed improvements in hardness and wear resistance.
- Further research may explore the corrosion resistance implications and optimal Sr content for specific applications.
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