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Variation of microstructure and mechanical properties of NbMoVCr high-entropy alloy coatings doped silicon
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DOI：10.1016/j.ijrmhm.2025.107092.png)
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Abstract
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NbMoVCrSix high-entropy alloy coatings with different Si contents were prepared, and the evolution in microstructure, mechanical properties, and wear behavior of the coatings was investigated comprehensively. The results showed that the coating structure transformed from the body-centered cubic phase to fully amorphous structure. With the trace Si doping, the hardness of the coating improved significantly, which was dominated by the effects of fine grain strengthening and solid solution strengthening. Meanwhile, the average friction coefficient and wear rate were decreased remarkably due to the improved hardness and toughness, and the formation of lubricating tribo-oxide layer containing SiO2. However, when Si doping was excessive, the comprehensive properties of the coating deteriorated seriously due to the reduced hardness and limited deformation ability.
Keywords:
High-entropy alloy coating
Si doping
Wear resistance
Strengthening mechanism
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