Effect of densi?cation distribution on the Young's modulus of porous coatings after nano-indentation

Xiaojuan LU 1,PingXIAO, Haiyan LI

doi:10.11890/1006-7191-125-383

Acta Metallurgica Sinica (English Letters) >

2012 , Vol. 25 >Issue 5: 383 - 390

DOI: https://doi.org/10.11890/1006-7191-125-383

Effect of densi?cation distribution on the Young^'s modulus of porous coatings after nano-indentation

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1. School of Environment Science and Engineering, North China Electric Power University, Yonghua North Street, Baoding 071000, China
2. School of Materials, The University of Manchester, Manchester M1 7HS, UK 3) School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, P.O. Box 88, Sackville Street, Manchester M60 1QD, UK

Online published: 2012-10-26

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Abstract

Nano-indentation of a porous ceramic coating leads to crushing and densification of the coating under the indenter. In this work, finite element simulations of indentation on the porous coating have been carried out to study the effect of the size and distribution of densification on Young^'s modulus measured by nano-indentation. Two totally different distribution patterns have been simulated in this work. In the case of gradient densification, the Young^'s modulus increased by 8.6% when the densification has occurred in the maximum in?uenced area. While the Young^'s modulus increased by 2% with a uniformed densification. Examinations of the cross-section of the coatings have suggested that the densification after the indentation is close to the second model. The measured Young^'s modulus could have differed by 2%. The effect of densification on the Young^'s modulus measured by using nano-indentation is strongly dependent on the densification patterns of the porous coating.

Key words： Mechanical property; Finite element simulation; Porosity; Electron Microscopy

Cite this article

Xiaojuan LU 1,PingXIAO, Haiyan LI . Effect of densi?cation distribution on the Young^'s modulus of porous coatings after nano-indentation[J]. Acta Metallurgica Sinica (English Letters), 2012 , 25(5) : 383 -390 . DOI: 10.11890/1006-7191-125-383

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