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Effect of annealing on microstructure and mechanical propertiesof AlTiN multilayer coatings

Luo Qing-Hong Lou Yan-Zhi Zhao Zhen-Ye Yang Hui-Sheng

Effect of annealing on microstructure and mechanical propertiesof AlTiN multilayer coatings

Luo Qing-Hong, Lou Yan-Zhi, Zhao Zhen-Ye, Yang Hui-Sheng
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  • Received Date:  27 July 2010
  • Accepted Date:  20 September 2010
  • Published Online:  15 June 2011

Effect of annealing on microstructure and mechanical propertiesof AlTiN multilayer coatings

  • 1. (1)Beijing Institute of Aeronautical Materials, Beijing 100095, China; (2)Department of Materials Physics and Chemistry, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The AlTiN composition multilayer coatings with a periodic change in nitrogen content are deposited on high speed steel (W18Cr4V) substrates with a medium-frequency reactive magnetron sputtering system and TiAl targets and by alternately changing nitrogen flux during deposition. These of coatings are annealed separately at temperatures of 600, 700 and 800 ℃ in vacuum for 5 hours. Their microstructures are studied by x-ray diffraction, field emission scanning electron microscopy, and high-resolution transmission electron microscopy, while their mechanical behaviors and adhesion properties are investigated using nano-indenter, scratch test, and friction and wear instrument. The results show that the AlTiN composition multilayer coatings obtained by alternately changing nitrogen flux during deposition possess stable and good mechanical properties. After 800 ℃ vacuum annealing, the interface of AlTiN multilayer coating is still very clear. Annealing increases crystallization degree and grain size of AlTiN multilayer coating, but the crystallization degree of high nitrogen content layer is still higher than that of low nitrogen content layer. After vacuum annealing, the hardness of AlTiN multilayer coating reduceds. The hardness of AlTiN multilayer coating after 800 ℃ annealing is larger than after 600 ℃ annealing, but as the annealing temperature increases, wear resistance and anti-spalling performance of AlTiN multilayer coatings decrease dramatically.

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