Microstructure and Mechanical Properties of Tough Phase Layers of a NiCoCrAl/YSZ Multiscalar Microlaminate

Abstract:

One multiscalar microlaminate comprising 66 thin strong layer stacks of NiCoCrAl / ZrO₂-8wt.%Y₂O₃ (YSZ) and 5 thick tough phase layers of NiCoCrAl whose thicknesses ranged from 5μm to 25μm was fabricated by Electron Beam Physical Vapor Deposition (EB-PVD) and followed by hot pressing treatment. Scanning electron microscopy was used to characterize the microstructures and failure mode of the tough phase layers. Tensile tests and nanoindentation tests were performed to evaluate the mechanical properties of the tough phase layers. The influence of thicknesses of tough phase layers on their microstructure and mechanical properties was investigated. It was found that with the increasing thicknesses of the tough phase layers, their hardness decreased, but their plasticity increased. There was a critical thickness for the tough phase layers between 13μm and 20μm. The tough phase layers with thickness less than the critical value displayed the different microstructure and failure mode from those with thickness more than the critical value.

• Periodical: Advanced Materials Research (Volume 1089)
• Pages: 15-19
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1089.15
• Online since: January 2015
• Authors: Chun Yu Jiang, Xiao Xiao Tian, Guo Dong Shi*
• Keywords: Electron Beam Physical Vapor Deposition, Mechanical Property, Microstructure, Multilayer Structure

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