期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 3, 页码 1111-1116出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.09.073
关键词
Finite element method; Nanoindentation; Multilayer coatings; Stress concentration; Fracture
Stress concentrations undermine the load-bearing ability of superhard TiSiN coatings. Experimental studies have shown that multilayer coatings that contain TiSiN layers alternating with ceramic layers with dissimilar mechanical properties suppress contact damage during nanoindentation. In this work, nanoindentation-induced deformation in TiSiN-based multilayer coatings was simulated by means of finite element modelling (FEM). Stress distributions under moderate indentation loading in the structure were quantified with particular emphasis on the relationship between stress concentrations and crack initiation. The results showed that the structural layering can be used to modify the stress distribution, and lower the overall stress level within the coating. In the case of radial tensile stresses at the coating/substrate interface, a reduction similar to 50% has been achieved through layering. The resistance to shear damage can also be improved by optimising the multilayer structure. (C) 2010 Elsevier B.V. All rights reserved.
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