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Preparation of Cross-Sectional TEM Samples of Fe-Zn Couples

Published online by Cambridge University Press:  21 February 2011

L. A. Giannuzzi ,
P. R. Howell ,
H. W. Pickering  and
W. R. Bidter
L. A. Giannuzzi
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
P. R. Howell
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
H. W. Pickering
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
W. R. Bidter
Affiliation:
Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802
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Abstract

A preparation technique for the production of cross-sectional transmission electron microscope (TEM) samples from the interdiffusion regions of Fe-Zn binary couples is described. To alleviate the problem of unequal ion milling rates between the Fe and Zn, a 0.75mm thick Fe sheet has been double plated with a thick electrodeposited Zn coating to achieve a total couple thickness of ˜3mm. After slicing the couple in cross-section, the Fe region of the sample is dimpled to perforation near the Fe-Zn interface. Final thinning for TEM analysis is obtained by ion milling using a liquid nitrogen cold stage and sector speed control. The ion milling procedure is stopped when the perforated hole in the Fe-side of the couple extends through the faster eroding Zn-side of the interface. This technique, in modified form, is expected to be suitable for commercial steels coated with Zn-based alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 254: Symposium W – Specimen Preparation for Transmission Electron Microscopy of Materials III , 1991 , 159
Copyright
Copyright © Materials Research Society 1992

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