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Crystallographic controlled dissolution and surface faceting in disordered face-centered cubic FePd

Published online by Cambridge University Press:  30 September 2014

D. J. Horton ,
A. W. Zhu ,
J. R. Scully  and
M. Neurock
D. J. Horton*
Affiliation:
Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, Virginia 22904
A. W. Zhu
Affiliation:
Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, Virginia 22904
J. R. Scully
Affiliation:
Department of Materials Science and Engineering, Center for Electrochemical Science and Engineering, University of Virginia, Charlottesville, Virginia 22904
M. Neurock
Affiliation:
Department of Chemical Engineering, University of Virginia, Charlottesville, Virginia 22904
*
Address all correspondence to D. J. Horton atdh7h@virginia.edu
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Abstract

Electrochemical dissolution by congruent oxidation of Fe Pd in 1 M HCl solution was strongly controlled by crystallographic orientation. Anodic dissolution was characterized over a wide variety of grain surface plane orientations providing a detailed view of the crystallographic nature of oxidative dissolution and surface facet evolution as a function of grain orientation. Near {100}-oriented grains retained low surface roughness after corrosion and low dissolution rates. Grains with orientation within 2° of {111} were also topographically smooth after dissolution and were nearly as corrosion resistant as {100} grains. Overall dissolution depth depended linearly on crystallographic angle within 40° of {100} and within 10° of {111} planes. Post-corrosion surface faceting and dissolution were substantially increased at grain orientations near {110} and were highest between 10° and 20° from the {111} plane normal. Grains at these crystallographic angles roughened during oxidative dissolution by forming complex semi-periodic topographies. These finely spaced arrays of terraces and ledges likely consisted of combinations of more corrosion resistant low-index planes. Therefore, the overall corrosion depth within a grain possessing an initially irrational crystal orientation was determined by the amount of dissolution required to expose new, slowly dissolving surface facets with low-index orientations. Computations of Fe–Pd alloy surface energies and surface atom coordination as a function of crystal orientation are utilized to help support this explanation.

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Type
Research Letters
Information
MRS Communications , Volume 4 , Issue 3 , September 2014 , pp. 113 - 119
Copyright
Copyright © Materials Research Society 2014 

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