Title

Role of mechanical loads in inducing in-cycle tensile stress in thermally grown oxide

Authors

Authors

R. Diaz; M. Jansz; M. Mossaddad; S. Raghavan; J. Okasinski; J. Almer; H. Pelaez-Perez;P. Imbrie

Comments

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Abbreviated Journal Title

Appl. Phys. Lett.

Keywords

BARRIER COATINGS; THERMOMECHANICAL FATIGUE; DAMAGE EVOLUTION; TBC; SYSTEM; SUPERALLOY; FAILURE; CRACKS; STRAINS; ALUMINA; CREEP; Physics, Applied

Abstract

Experimental in situ synchrotron x-ray diffraction results tracking the strain behavior of the various layers during a cycle, under thermo-mechanical conditions are presented in this work. The quantitative strain measurements here show that the thermally grown oxide briefly experiences in-plane tensile stress (sigma(22) = +36.4 MPa) with increased mechanical loading during ramp-up in the thermal cycle. These findings are the first in situ experimental observations of these strains under thermo-mechanical conditions, envisaged to serve as a catalyst for crack initiation. The depth resolved measurements of strain taken during applied thermal and mechanical load in this work are a significant step towards achieving realistic testing conditions. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3692592]

Journal Title

Applied Physics Letters

Volume

100

Issue/Number

11

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

4

WOS Identifier

WOS:000302204900029

ISSN

0003-6951

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