Micromechanisms of damage nucleation during contact deformation of columnar multilayer nitride coatings

被引：20

作者：

Verma, Nisha ^{[1
]}

Cadambi, Sumanth ^{[1
]}

Jayaram, Vikram ^{[1
]}

Biswas, Sanjay Kumar ^{[2
]}

机构：

[1] Indian Inst Sci, Dept Mat Engn, Bangalore 560012, Karnataka, India

[2] Indian Inst Sci, Dept Mech Engn, Bangalore 560012, Karnataka, India

来源：

ACTA MATERIALIA | 2012年 / 60卷 / 6-7期

关键词：

TiN; Transmission electron microscopy; Nanoindentation; Multilayer thin films; Fracture mechanisms; THIN HARD FILMS; TIN COATINGS; NUMERICAL-ANALYSIS; INDENTATION; MICROSTRUCTURE; MECHANISMS; DEPOSITION; FRACTURE; WEAR; NANOINDENTS;

D O I：

10.1016/j.actamat.2012.02.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In order to resolve some missing micromechanistic details regarding contact deformation in nitride multilayer coatings we report here observations from cross-sectional transmission electron microscopy and focused ion beam studies of the Vickers indentations on TiN/TiAlN multilayer films of various total thicknesses as well as bilayer periods. The study of damage induced by contact deformation in a nitride multilayer coating is complemented by stress calculated using an analytical model. Kinked boundaries of sliding columns give rise to cracks which propagate at an angle to the indentation axis under a combination of compressive and shear stresses. It is seen that multilayers provide more distributed columnar sliding, thereby reducing the stress intensity factor for shear cracking, while interfacial dislocations provide a stress relief mechanism by enabling lateral movement of material. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3063 / 3073

页数：11

共 41 条

[1] Deposition, microstructure and mechanical and tribological properties of magnetron sputtered TiN/TiAlN multilayers [J].