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Nanoindentation Evaluation of Passive Film Stress and Growth Kinetics

Published online by Cambridge University Press:  10 February 2011

N. I. Tymiak ,
J. C. Nelson ,
W. W. Gerberich  and
D. F. Bahr
N. I. Tymiak
Affiliation:
CEMS Department, University of Minnesota, Minneapolis, MN 55455, tymiak@cems.umn.edu
J. C. Nelson
Affiliation:
CEMS Department, University of Minnesota, Minneapolis, MN 55455, tymiak@cems.umn.edu
W. W. Gerberich
Affiliation:
CEMS Department, University of Minnesota, Minneapolis, MN 55455, tymiak@cems.umn.edu
D. F. Bahr
Affiliation:
School of Mechanical and Materials Engineering, Washington State University, Pullman, WA.
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Abstract

Load controlled nanoindentation in conjunction with a potential step method were utilized for the investigation of precipitated iron sulfate film stresses and growth. Two types of experiments have been undertaken on thin sheet samples of Fe 3% Si single crystal in IM H2SO4. Samples were either allowed to deflect in the indentation direction or constrained. A distinctive difference between the indentation curves for the above two types of tests allowed separation of the effects of film stresses and local electrochemical processes. A proposed theoretical model accounting for both electrochemical and mechanical effects allowed modeling of the indenter tip motion following a potential step. Within the scope of the model, the time dependent film thickness (3.5 μm at maximum), electrostrictive film stress (330 MPa at maximum) have been determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 251
Copyright
Copyright © Materials Research Society 1998

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