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Shear strength and sliding behavior of Ni/Al2O3 interfaces: A first-principle study

Published online by Cambridge University Press:  23 March 2012

Xiancong Guo  and
Fulin Shang
Xiancong Guo
Affiliation:
Department of Engineering Mechanics, State Key Laboratory for Mechanical Structure Strength and Vibration, Xi’an Jiaotong University, Xi’an 710049, China
Fulin Shang*
Affiliation:
Department of Engineering Mechanics, State Key Laboratory for Mechanical Structure Strength and Vibration, Xi’an Jiaotong University, Xi’an 710049, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

First-principle calculations are performed to investigate the mechanical shear strength and sliding characteristic of Ni(111)/α-Al2O3(0001) interfaces. Two types of interface models are considered, i.e., Al-terminated O-site and O-terminated Al-site models. Mechanical properties such as theoretical shear strength, unstable stacking energy, and critical displacement are examined. It is found that the shear deformation of the Ni/Al2O3 interfaces takes place by a process of successive breaking and rebonding of the Al–O bonds near the Al2 or Al3 atom inside the α-Al2O3 block accompanying the sliding of Ni atomic layer, and finally the Ni/Al2O3 interfaces fail between the Ni atomic layer. Relatively, the Al–O interface possesses a superior shear resistance than the O–Al interface. In addition, the mechanical shear strength and tensile strength are discussed, together with the potential usage of these theoretical results that could offer in fabricating actual thermal barrier coating systems and in analyzing their mechanical response.

Keywords

CoatingStress/strain relationshipStrength
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 9 , 14 May 2012 , pp. 1237 - 1244
Copyright
Copyright © Materials Research Society 2012

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