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Microstructures and Thermal Properties of Rapidly Solidified Aluminum-Rare Earth Alloys

Published online by Cambridge University Press:  25 February 2011

D. Eliezer ,
S. J. Savage ,
Y. R. Mahajan  and
F. H. Froes
D. Eliezer
Affiliation:
Sabbatical leave from the Ben-Gurion University of the Negev, Beer Sheva, Israel
S. J. Savage
Affiliation:
Now with the Swedish Institute for Metals Research, S-114 28 Stockholm, Sweden
Y. R. Mahajan
Affiliation:
Air Force Wright Aeronautical Laboratories, Materials Laboratory, AFWAL/MLLS, Wright-Patterson Air Force Base, OH 45433
F. H. Froes
Affiliation:
Air Force Wright Aeronautical Laboratories, Materials Laboratory, AFWAL/MLLS, Wright-Patterson Air Force Base, OH 45433
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Abstract

Rapidly solidified (RS) Al-Er, Al-Nd, and Al-Gd ribbons were prepared by pendant drop melt extraction (PDME). The microstructures were studied in detail by optical and transmission electron microscopy. A wide range of microstructures are observed, including “conventional” RS type zones, a cellular structure surrounded by a degenerate eutectic and coupled (lamellar) eutectic structures. A bimodal precipitate distribution is seen in many areas of the ribbons. A series of isochronal heat treatments was conducted to determine the relative thermal stability of these microstructures, which were evaluated by Knoop microhardness measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 58 , 1985 , 293
Copyright
Copyright © Materials Research Society 1986

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References

REFERENCES

1.Froes, F. H. and Pickens, J. R., J. Metals 36 (1), 14–28 (1984).Google Scholar
2.Gschneidner, K. A. Jr and Calderwood, F. W., Rare Earth Information Center Report No. IS-RIC-PR-5, 1983.Google Scholar
3.Savage, S. J. and Froes, F. H., J. Metals 36 (4), 20–33 (1984).Google Scholar
4.Maringer, R. E. and Mobley, C. E., in Rapidly Quenched Metals III, Vol. I, edited by Cantor, B. (The Metals Society, London, 1978), pp. 49–56.Google Scholar