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Applied Physics Letters / Volume 100 / Issue 11 / STRUCTURAL, MECHANICAL, OPTICAL, AND THERMODYNAMIC PROPERTIES OF ADVANCED MATERIALS

Appl. Phys. Lett. 100, 111906 (2012); http://dx.doi.org/10.1063/1.3692592 (4 pages)

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

Rene Diaz1, Melan Jansz1, Mitra Mossaddad1, Seetha Raghavan1, John Okasinski2, Jonathan Almer2, Hugo Pelaez-Perez3, and Peter Imbrie3

1Mechanical, Materials and Aerospace Engineering Department, University of Central Florida, Orlando, Florida 32816, USA
2X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
3School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana 47907, USA

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(Received 2 January 2012; accepted 20 February 2012; published online 14 March 2012)

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 (σ22 = +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.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

catalysts, cracks, strain measurement, tensile strength, thermomechanical treatment, X-ray diffraction

PACS

  • 81.40.Lm

    Deformation, plasticity, and creep

  • 81.40.Gh

    Other heat and thermomechanical treatments

  • 82.65.+r

    Surface and interface chemistry; heterogeneous catalysis at surfaces

  • 81.40.Np

    Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

  • 62.20.mt

    Cracks

  • 62.20.F-

    Deformation and plasticity

International Patent Classification (IPC)

  • B01J

    Chemical or physical processes, e.g. catalysis, colloid chemistry; Their relevant apparatus

  • C21D1/00

    General methods or devices for heat treatment, e.g. annealing, hardening, quenching, tempering

  • C21D8/00

    Modifying the physical properties by deformation combined with, or followed by, heat treatment

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3692592

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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    References


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