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Open AccessArticle

Microstructure, Properties, and Titanium Cutting Performance of AlTiN–Cu and AlTiN–Ni Coatings

by Jiyong Yi 1,*, Kanghua Chen 2,* and Yinchao Xu 2
1
School of Physical and Mechanical Engineering, Jishou University, Jishou 416000, China
2
Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
*
Authors to whom correspondence should be addressed.
Coatings 2019, 9(12), 818; https://doi.org/10.3390/coatings9120818
Received: 11 September 2019 / Revised: 2 November 2019 / Accepted: 22 November 2019 / Published: 3 December 2019
In this study, three kinds of coatings, AlTiN, AlTiN–Ni, and AlTiN–Cu were deposited via the cathodic arc evaporation method. The microstructure, mechanical properties, oxidation resistance, and cutting behavior of these coatings were then investigated. The incorporation of Cu(Ni) into AlTiN eliminated its columnar structure and led to an increase in the growth defects of its macroparticles. The addition of Cu and Ni decreased the hardness of the coatings, their elastic moduli, and their friction coefficients. All of the AlTiN, AlTiN–Ni, and AlTiN–Cu coatings presented sufficient adhesion strength values. The oxidation resistance of these three coatings was determined to be in the following order: AlTiN > AlTiN–Ni > AlTiN–Cu. Titanium turning experiments indicated that the cutting force was reduced and the tool life was improved through doping with Cu(Ni) elements, dependent on cutting speed. The AlTiN–Ni coating showed the best performance at a high cutting speed, whereas the AlTiN–Cu coating was more successful at a lower cutting speed. View Full-Text
Keywords: AlTiN–Ni coating; AlTiN–Cu coating; oxidation resistance; titanium cutting AlTiN–Ni coating; AlTiN–Cu coating; oxidation resistance; titanium cutting
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Yi, J.; Chen, K.; Xu, Y. Microstructure, Properties, and Titanium Cutting Performance of AlTiN–Cu and AlTiN–Ni Coatings. Coatings 2019, 9, 818.

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