**4. Conclusions**

A compact AlCoCrFeNiTi/Ni60 coating with Ni60 splats uniformly distributed in AlCoCrFeNiTi matrix was deposited by plasma spraying. After spraying, matrix BCC, FCC, and ordered BCC phases were detected in the coating.

The added large Ni60 particles played an important role in strengthening the coating. A strong mechanical bonding between Ni60 and AlCoCrFeNiTi splats caused a higher cohesion strength. Tensile test results showed that bonding strength of this coating was above 60.1 MPa, which is far higher than that of the AlCoCrFeNiTi coating in the previous study.

An average microhardness of 676 HV was obtained for the main body of the coating, which is far higher than that of the HEA coating in the previous work. The main reason can be attributed to the addition of the reinforcement, Ni60. Solution hardening in γ-Ni and dispersion strengthening of the hard interstitial compounds, such as Cr7C3, CrB, Cr2B, and Cr23C6 increased the hardness of Ni60, and then the HEA/Ni60 coating.

During wear testing at 25 ◦C, adhesive wear and abrasive wear occurred, while at 500 ◦C, abrasive wear took place. Volume wear rates of the coating at 25 ◦C and 500 ◦C were 0.55 ± 0.06 × 10−<sup>4</sup> mm3·N−1·m<sup>−</sup><sup>1</sup> and 0.66 ± 0.02 × 10−<sup>4</sup> mm3·N−1·m<sup>−</sup>1, respectively. Wear resistance of this coating was better than that of the HEA coating, which can result from the addition of the hard Ni60. Therefore, Ni60 is an appropriate reinforcement to further enhance the wear resistance of HEA coating.

**Acknowledgments:** This work was supported by the National Natural Science Foundation of China (grant number 51401091); a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); and a Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP).

**Author Contributions:** Lihui Tian and Wei Xiong conceived and designed the experiments; Lihui Tian, Zongkang Feng, and Wei Xiong performed the experiments and analyzed the data; and Lihui Tian wrote the paper.

**Conflicts of Interest:** The authors declare no conflict of interest.
