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Selective Etching and Laser Melting Studies of Monotectic Composite Structures

Published online by Cambridge University Press:  15 February 2011

L. M. Angers ,
R. N. Grugel ,
A. Hellawell  and
C. W. Draper
L. M. Angers
Affiliation:
Northwestern University Evanston, IL 60201
R. N. Grugel
Affiliation:
Michigan Tech. UniversityHoughton, MI 49931
A. Hellawell
Affiliation:
Michigan Tech. UniversityHoughton, MI 49931
C. W. Draper
Affiliation:
Western Electric Eng. Center Princeton, NJ 08540
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Abstract

Thin slices of directionally solidified, fibrous composite, monotectic alloy samples have been selectively etched to remove the fibrous phase, so to produce fine sieves of filters having pore diameters ≲10μm. Alloys in systems Al-In, Al-Bi and CuAl-Pb have been examined using as etchants aqueous nitric acid (Al-In, Al-Bi) and aqueous citric acid (CuAl-Pb) without applied anode voltages. These alloys and etchants illustrate examples in which fiber and matrix are attacked to different extents (Al-In), the phase interface is selectively attacked (Al-Bi) or only the fibers are attacked (CuAl-Pb). Hole sizes and perfection are compared for etching times, concentrations and anode voltage.

Laser melting of the surface of CuAl-Pb samples has been used to screen or frame areas of the composite microstructure and also shows how local melting of the fibrous Pb phase can be used to assess the heat affected zone.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 12: Symposium L – In Situ Composites IV , 1981 , 205
Copyright
Copyright © Materials Research Society 1982

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References

REFERENCES

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