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Solidification of Undercooled Monotectic Alloys

Published online by Cambridge University Press:  15 February 2011

J. H. Perepezko ,
C. Galaup  and
K. P. Cooper
J. H. Perepezko
Affiliation:
University of Wisconsin-Madison, Department of Metallurgical and Mineral Engineering, 1509 University Avenue., Madison, WI 53706, U.S.A;
C. Galaup
Affiliation:
Centre de Recherches de Pont-à-Mousson, Maidieres 54700, Pont-à-Mousson, France.
K. P. Cooper
Affiliation:
University of Wisconsin-Madison, Department of Metallurgical and Mineral Engineering, 1509 University Avenue., Madison, WI 53706, U.S.A;
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Abstract

During the processing of monotectic alloys large compositional segregation of the liquid can precede final solidification. Under normal treatment a coarse scale phase distribution is obtained as a result of convection and sedimentation effects which may be minimized by microgravity processing. In undercooled droplets (5–20μ) of Bi-Ga alloys with compositions near the monotectic point, a finescale segregation has been observed and is similar to that formed during a microgravity treatment of bulk samples. Near the critical point of the miscibility gap, Bi-rich alloys exhibit an undercooling prior to phase separation, while in Ga-rich alloys the onset of phase separation is at the miscibility gap boundary. Similarly, in Cu-Pb alloys an undercooling below the miscibility gap prior to phase separation is observed for Cu-rich alloys, but not for Pb-rich alloys near the critical point. These observations are consistent with the operation of a critical point wetting behavior which can modify the liquid segregation pattern during microgravity treatment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 491
Copyright
Copyright © Materials Research Society 1982

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References

REFERENCES

1.Knight, R. J., Li, Che-Yu and Spencer, C. W., Trans. A.I.M.E. 227, 18 (1963).Google Scholar
2.Livingston, J. D. and Cline, H. E., Trans. A.I.M.E., 245, 351 (1969).Google Scholar
3.Kamio, A. and Oya, S., Nippon Kinzoku Gazkkai, 33, 60 (1969).Google Scholar
4.Grugel, R. and Hellawell, A., Met. Trans., 12A, 669 (1981).Google Scholar
5.Parr, R. A. and Johnston, M. H., Met. Trans. 9A, 1825 (1978).Google Scholar
6.Potard, C., AIAA paper no. 79–0173 (1979).Google Scholar
7.Charles, R. J., J. Am. Ceram. Soc. 49, 55 (1966).Google Scholar
8.Seward, T. P. III, Uhlmann, D. R. and Turnbull, D., J. Am. Ceram. Soc. 51, 278 (1968).10.1111/j.1151-2916.1968.tb13858.xGoogle Scholar
9.Nakagawa, Y., Acta Met. 6, 704 (1958).Google Scholar
10.Carruthers, J. R., J. Crystal Growth 42, 379 (1977).Google Scholar
11.Lacy, L. L., Robinson, M. B. and Rathz, T. J., J. Crystal Growth 51, 47 (1981).Google Scholar
12.Steinberg, J., Lord, A. E. Jr., Lacy, L. L. and Johnson, J., Appl. Phys. Lett. 38, 135 (1981).Google Scholar
13.Lacy, L. L. and Otto, G. H., AIAA Journal 13, 219 (1975).Google Scholar
14.Perepezko, J. H. in: Rapid Solidification Processing: Principles and Technologies II, Cohen, M., Kear, B. H. and Mehrabian, R. eds. (Claitors Pub., Baton Rouge 1980) p. 51.Google Scholar
15.Perepezko, J. H. and Anderson, I. E. in: Synthesis and Properties of Metastable Phases, Rowland, T. J. and Machlin, E. S. eds. (TMS-AIME, Warrendale PA. 1981)p. 31.Google Scholar
16.Galaup, C. and Perepezko, J. H., to be published.Google Scholar
17.Bosio, L., Defrain, A. and Epelboin, I., Le Journal de Physique 27, 61 (1966).Google Scholar
18.Murray, J., National Bureau of StandardsWashington, D.C., private communication.Google Scholar
19.Cahn, J. W., J. Chem. Phys. 66, 3667 (1977).Google Scholar
20.Moldover, M. R. and Cahn, J. W., Science 207, 1073 (1980).Google Scholar
21.Gelles, S. H. and Markworth, A. J., AIAA Journal 16, 431 (1978).10.2514/3.60908Google Scholar
22.Carlberg, T. and Fredriksson, H., Met. Trans. 11A, 1665 (1980).Google Scholar
23.Sekerka, R. F. and Coriell, S. R. in: Proceedings of the Third European Symposium - Materials Sciences in Space, Guyenne, T. D. ed. (ESA, SP–142 Paris, 1980) pp. 55–65.Google Scholar