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In situ electrochemical nanoindentation of FeAl (100) single crystal: Hydrogen effect on dislocation nucleation

Published online by Cambridge University Press:  31 January 2011

Afrooz Barnoush ,
Christian Bies  and
Horst Vehoff
Afrooz Barnoush*
Affiliation:
Saarland University, Department of Materials and Methods, Saarbruecken 66123, Germany
Christian Bies
Affiliation:
Saarland University, Department of Materials and Methods, Saarbruecken 66123, Germany
Horst Vehoff
Affiliation:
Saarland University, Department of Materials and Methods, Saarbruecken 66123, Germany
*
a) Address all correspondence to this author.e-mail: a.barnoush@matsci.uni-sb.de
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Abstract

The hydrogen effect on dislocation nucleation in FeAl single crystal with (100) surface orientation has been examined with the aid of a specifically designed nanoindentation setup for in situ electrochemical experiments. The effect of the electrochemical potential on the indent load–displacement curve, especially the unstable elastic-plastic transition (pop-in), was studied in detail. The observations showed a reduction in the pop-in load for both samples due to in situ hydrogen charging, which is reproducibly observed within sequential hydrogen charging and discharging. Clear evidence is provided that hydrogen atoms facilitate homogeneous dislocation nucleation.

Keywords

DislocationsEmbrittlementNanoindentation
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 1105 - 1113
Copyright
Copyright © Materials Research Society 2009

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