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The Influence of Hard Coatings on Fatigue Properties of Pure Titanium by a Novel Testing Method
Cai Hu1,2, Lei Zhao3, Yong Zhang1
1School of Materials Science and Engineering, Central South University, Changsha 410083, China.
Abstract:
This study investigates the impact of hard coatings on the fatigue properties of pure titanium. A specialized fatigue test which ensured machine equivalence was conducted to compare the fatigue behavior of coated and uncoated metals. The findings reveal that the application of coatings adversely affects the fatigue properties of pure titanium due to stress concentration from the coating, which accelerates fatigue crack propagation within the substrate material. Notably, zigzag fatigue cracks at the interface between the coating and substrate and multiple micro-cracks initiated within the coating are found.
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