Direct observations of dislocation arrangements about a range of microindentations into the  face of an Fe-3 wt. % Si single crystal have been accomplished. Dislocations of both large loop character initiated from the indenter and small loop character initiated as secondary reactions are found. Analysis of these allows the various contributions to the plastic strain gradient around the indentation to be assessed, with the experimental observations being reasonably consistent with continuum models.
Bibliographical noteFunding Information:
This research was supported by the Center for Interfacial Engineering at the University of Minnesota under Grant No. NSF/CDR-8721551. Support from the Corrosion Center of the University of Minnesota and the Department of Energy, Basic Energy Sciences, Materials