Elasto-plastic characteristics and mechanical properties of as-sprayed 8 mol% yttria-stabilized zirconia coating under nano-scales measured by nanoindentation

被引：11
作者：
Luo, J. M. [1 ,2 ]
Dai, C. Y. [1 ,2 ]
Shen, Y. G. [3 ]
Mao, W. G. [1 ,2 ]
机构：
[1] Xiangtan Univ, Fac Mat Optoelect & Phys, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Key Lab Low Dimens Mat & Applicat Technol, Xiangtan 411105, Hunan, Peoples R China
[3] City Univ Hong Kong, Dept Mech & Biomed Engn, Kowloon, Hong Kong, Peoples R China
来源：
APPLIED SURFACE SCIENCE | 2014年 / 309卷
基金：
中国国家自然科学基金;
关键词：
Thermal barrier coating; Nanoindentation; Mechanical properties; Indentation size effect; Resolved shear stress; THERMAL-BARRIER COATINGS; FOREIGN OBJECT DAMAGE; SINGLE-CRYSTAL; INSTRUMENTED INDENTATION; PLASTIC-DEFORMATION; ELASTIC-MODULUS; EROSION; STRESS; BEHAVIOR; HARDNESS;
D O I：
10.1016/j.apsusc.2014.05.026
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The elasto-plastic characteristics and mechanical properties of as-received 8 mol% Y2O3-ZrO2 (8YSZ) coatings were studied by nanoindentation at ultra-low loads with a Berkovich indenter at room temperature. All experimental data including hardness H and elastic modulus E were analyzed by the Weibull statistical method due to the porous and heterogeneous nature of the tested samples. It was found that the hardness firstly exhibits interesting reverse indentation size effect, and then shows normal indentation size effect within different indentation scales. The average elastic modulus of 8YSZ was estimated as 214.8 +/- 13.2 GPa. In order to reveal the elasto-plastic characteristics of 8YSZ at nano-scales, the distribution of resolved shear stresses underneath the indenter tip region was evaluated by Hertzian contact theory when the deformation behavior of 8YSZ changed from fully elastic to elasto-plastic stages. The results shed light on understanding possible foreign object damage mechanisms of thermal barrier coating systems. (C) 2014 Elsevier B.V. All rights reserved.
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页码：271 / 277
页数：7
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