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Stress Determination in Thermally Grown Alumina Scales Using Ruby Luminescence

Published online by Cambridge University Press:  15 February 2011

D. Renusch ,
B. W. Veal ,
I. Koshelev ,
K. Natesan ,
M. Grimsditch  and
P. Y. Hou
D. Renusch
Affiliation:
Argonne National Laboratory, Argonne IL 60439, USA
B. W. Veal
Affiliation:
Argonne National Laboratory, Argonne IL 60439, USA
I. Koshelev
Affiliation:
Argonne National Laboratory, Argonne IL 60439, USA
K. Natesan
Affiliation:
Argonne National Laboratory, Argonne IL 60439, USA
M. Grimsditch
Affiliation:
Argonne National Laboratory, Argonne IL 60439, USA
P. Y. Hou
Affiliation:
Lawrence Berkeley Laboratory, Berkeley CA 94720, USA
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Abstract

By exploiting the strain dependence of the ruby luminescence line, we have measured the strain in alumina scales thermally grown on Fe-Cr-Al alloys. Results are compared, and found to be reasonably consistent with strains determined using x-rays. Oxidation studies were carried out on alloys with compositions Fe - 5 Cr - 28 Al and Fe - 18 Cr - 10 Al (at. %, bal. Fe). Significantly different levels of strain buildup were observed in scales on these alloys. Results on similar alloys containing a “reactive element” (Zr or Hf) in dilute quantity are also presented. Scales on alloys containing a reactive element (RE) can support significantly higher strains than scales on RE-free alloys. With the luminescence technique, strain relief associated with spallation thresholds is readily observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 436: Symposium CC – Thin Films Stresses and Mechanical Properties VI , 1996 , 511
Copyright
Copyright © Materials Research Society 1997

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