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A New Specimen Preparation Technique for Metallographic Evaluation of Lead and Lead Alloys

Published online by Cambridge University Press:  02 July 2020

J.M. Vahaaho  and
P.A. Zieliński
J.M. Vahaaho
Affiliation:
Cominco Research, P.O.Box 2000, Trail, B.C., CanadaV1R 4S4
P.A. Zieliński
Affiliation:
Cominco Research, P.O.Box 2000, Trail, B.C., CanadaV1R 4S4
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Extract

Preparation of lead and lead alloy specimens for metallographic examination is more difficult than preparation of the majority of other metals and their alloys. The troublesome difference is that lead and lead alloys are soft (lead has a Vickers hardness of 4-5 [1,2]), and therefore readily develop a cold-worked surface layer and disturbances in the subsurface layers during mechanical polishing. The specimen softness also allows embedding of the abrasive particles. If not removed, these mechanically introduced artifacts obscure the true structure of the specimen, and in some cases could develop a pseudostructure, especially if excessive frictional heat is involved [1]. Usually etchpolishing, consisting of cycles of alternately etching, polishing, and microscopic examination, is required to remove the above artifacts. This treatment either might not completely remove these artifacts or it might overetch the sample. In addition, etching could introduce its own artifacts, such as tarnishing, etching pits, or both.

Type
Specimen Preparation Poster Session
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 918 - 919
Copyright
Copyright © Microscopy Society of America

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References

1.ASM Handbook v 9, Metallography and Microstructures, ASM International. Metals Park, OH (1992), pp. 415–424.Google Scholar
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