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Isothermal Diffusion Behavior and Surface Performance of Cu/Ni Coating on TC4 Alloy
Nan Wang1, Yong-Nan Chen1, Long Zhang1
1School of Materials Science and Engineering, Chang'an University, Xi'an 710064, China.
Materials (Basel, Switzerland)
|November 28, 2019
Summary
Electroplating copper and nickel onto TC4 alloy and heat treating it created diffusion layers. However, prolonged heating caused voids and cracks, weakening surface performance.
Area of Science:
- Materials Science
- Surface Engineering
- Metallurgy
Background:
- Titanium alloys like TC4 have poor surface performance, limiting their use in industries like petrochemicals.
- Improving surface properties is crucial for expanding titanium alloy applications.
Purpose of the Study:
- To investigate the effects of isothermal diffusion on Cu/Ni coatings on TC4 alloy.
- To analyze the resulting microstructure, diffusion behavior, and surface performance.
Main Methods:
- Electrodeposition of Cu and Ni double layers on TC4 alloy.
- Isothermal diffusion treatment at 700 °C for varying durations.
- Microstructural analysis, tribological testing, and corrosion resistance evaluation.
Main Results:
- Formation of multiple diffusion layers (NixTiy, CuxTiy) at Cu/Ni and Ni/Ti interfaces.
- Occurrence of Kirkendall diffusion with increased diffusion time.
- Development of microvoids and cracks in diffusion layers, negatively impacting surface performance.
Conclusions:
- Isothermal diffusion influences the microstructure and properties of Cu/Ni coatings on TC4 alloy.
- Optimizing diffusion time is critical to avoid defect formation and enhance surface performance.
- Findings provide guidance for developing high-performance surface coatings for titanium alloys.
