Preparation and microstructure of AlCoCrFeNi high-entropy alloy complex curve coatings

Abstract

For the preparation of complex curve coatings via the high-energy micro-arc spark-computer numerical control deposition (HEMAS-CNCD) process, an equi-arc length deposition approach is presented and realised by proposing a new interpolation method of the fixed step plus golden section interpolation (FS + GSI). The simulations and experiments show that the FS + GSI method can carry out the equi-arc length deposition of complex curve coatings with high precision. The AlCoCrFeNi high-entropy alloy coatings are prepared via HEMAS-CNCD using three sets of process parameters. The results of scanning electron microscope and X-ray diffraction show that the three coatings are composed of hexagonal close packed solid solution (as a matrix phase) and body-centred cubic solid solution (as a minor phase).

Keywords:

• High-energy micro-arc spark deposition
• Electrospark deposition
• Equi-arc length deposition
• Fixed step plus golden section
• High-entropy alloy coatings

Acknowledgements

This project is supported by National Natural Science Foundation of China (Grant no. 51465030, 51275135, 51474081 and 51321061), Scientific Research Fund of Gansu Provincial Department (Grant no.2015A-050), and The Funds for Distinguished Young Scientists of Heilongjiang Province (Grant no. JC2015011).