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Nanoindentation and nanoscratch of a thermal oxide layer on a FeAl alloy

Published online by Cambridge University Press:  03 March 2011

J. Xia ,
C.X. Li ,
H. Dong  and
T. Bell
J. Xia*
Affiliation:
Department of Metallurgy and Materials, School of Engineering, The University of Birmingham, Birmingham B15 2TT, United Kingdom
C.X. Li
Affiliation:
Department of Metallurgy and Materials, School of Engineering, The University of Birmingham, Birmingham B15 2TT, United Kingdom
H. Dong
Affiliation:
Department of Metallurgy and Materials, School of Engineering, The University of Birmingham, Birmingham B15 2TT, United Kingdom
T. Bell
Affiliation:
Department of Metallurgy and Materials, School of Engineering, The University of Birmingham, Birmingham B15 2TT, United Kingdom
*
a)Address all correspondence to this author. e-mail: jxx096@bham.ac.uk
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Abstract

An iron aluminide (Fe–40 at.% Al) was thermal oxidation (TO)-treated at 1000 °C for 30 to 150 h. The mechanical properties (e.g., hardness and elastic modulus), the scratch resistance, the deformation and damage behaviors of the TO-treated surface layers were evaluated using nanoindentation and nanoscratch techniques. It has been found that the TO treatment produced an oxide layer containing α–Al2O3 on the iron aluminide surface, which increased the surface hardness (H) and elastic modulus (Er) but reduced the ratio of Er/H. This has significantly improved the scratch resistance of the iron aluminide. Longer treatment resulted in a thicker oxide layer and led to further reduced scratch rate and an increased critical load to failure. The scratch resistance has been correlated with the scratch load, the hardness, and the Er/H ratio of the surface oxide layer.

Keywords

NanoindentationTribologyMechanical properties

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Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 1 , January 2004 , pp. 291 - 300
Copyright
Copyright © Materials Research Society 2004

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