On the relevance of microstructure in the fracture toughness of nanostructured alumina-13% titania coatings

被引：11

作者：

Rico, A. ^{[1
]}

Munez, C. J. ^{[1
]}

Rodriguez, J. ^{[1
]}

机构：

[1] Rey Juan Carlos Univ, Dept Tecnol Mecan, Mostoles 28935, Spain

来源：

SURFACE & COATINGS TECHNOLOGY | 2014年 / 243卷

关键词：

Fracture toughness; Depth sensing indentation; Alumina-titania coatings; Nanostructured coatings; MECHANICAL-PROPERTIES; ALUMINA/TITANIA COATINGS; NANOCRYSTALLINE POWDERS; PLASMA; BEHAVIOR;

D O I：

10.1016/j.surfcoat.2012.03.021

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Al2O3-13% TiO2 nanostructured coatings, deposited using agglomerates of nanoparticles as feeding powders, were studied. Indentation fracture toughness has been determined in the coatings by means of depth sensing indentation. Results were compared to conventional coatings with similar composition. The relevance of the nanostructure was analyzed. Substantially improved behavior was observed in the nanostructured coatings. Increments close to 40% in fracture toughness were measured. Toughening mechanisms such as crack deflection by the microstructural features and compressive residual stress fields are thought to be responsible for the observed behavior. A theoretical model describing these phenomena was applied and a reasonable agreement with experiments was achieved. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：46 / 50

页数：5

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