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Undercooling Behavior of Liquid Metals

Published online by Cambridge University Press:  15 February 2011

J. H. Perepezko  and
J. S. Paik
J. H. Perepezko
Affiliation:
University of Wisconsin-Madison, Department of Metallurgical and Mineral Engineering, 1509 University Ave., Madison, WI 53706
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Abstract

The undercooling of liquid metals is observed often, but is restricted by the catalysis of the most potent heterogeneous nucleation site in contact with the liquid. An experimental approach that yields large undercoolings involves the slow cooling from the melt of a dispersion of stabilized fine (5–20μ) liquid droplets. Droplet studies have extended measurements of the undercooling limit for low melting point metals to the range of 0.3 to 0.4 Tm. In droplets, surface coating and size characteristics usually limit the undercooling and control the uniformity of crystallization behavior. A nonuniform undercooling behavior can produce microstructural variations in powder samples with respect to metastable phases and solute segregation, but these variations can be diminished for isenthalpic solidification of hypercooled liquids. In alloys the trend in nucleation temperature can follow a similar pattern as the composition dependence of the liquidus. With highly undercooled droplets and even at modest ΔT (ΔT ≤ 0.lTm) with known heterogeneous sites, structural modifications such as extended solid solutions and metastable intermediate phases can be generated which are similar to those produced by rapid quenching techniques. These features highlight the importance of a high liquid undercooling as well as a high cooling rate in promoting effective rapid solidification processing treatments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 8 , 1981 , 49
Copyright
Copyright © Materials Research Society 1982

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References

REFERENCES

1.Baker, J. C. and Cahn, J. W., in Solidification (ASM, Metals Park, Ohio, 1971) 23.Google Scholar
2.Boettinger, W. J., This Proceedings.Google Scholar
3.Cohen, M., Kear, B. H. and Mehrabian, R., in Rapid Solidification Processing: Principles and Technologies II, Mehrabian, R., Kear, B. H. and Cohen, M.eds. (Claitor's Pub., Baton Rouge, LA, 1980) 1.Google Scholar
4.Turnbull, D. and Cech, R. E., J. Appl. Phys. 21, 804 (1950).Google Scholar
5.Perepezko, J. H., in Rapid Solidification Processing: Principles and Technologies II, Mehrabian, R., Kear, B. H. and Cohen, M. eds.(Claitor's Pub., Baton Rouge, LA, 1980) 56.Google Scholar
6.Pound, G. M. and LaMer, V. K., J. Am. Chem. Soc. 74, 2323 (1952).10.1021/ja01129a044Google Scholar
7.Wang, C. C. and Smith, C. S., Trans AIME 188, 136 (1950).Google Scholar
8.Kattamis, T. Z. and Flemings, M. C., Trans AIME 236, 1523 (1966).Google Scholar
9.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, 1980) 31.Google Scholar
10.Paik, J. S. and Perepezko, J. H., to be published.Google Scholar
11.Hultgren, R., Desai, P. D., Hawkins, D. T., Glesier, M., Kelley, K. K. and Wagman, D. D.Selected Values of Thermodynamic Properties of the Elements (ASM, Metals Park, Ohio 1973).Google Scholar
12.Turnbull, D., J. Chem. Phys. 20,411 (1952).10.1063/1.1700435Google Scholar
13.Bosio, L., Defrain, A. and Epelboin, I., J. de Phys. 27, 61 (1966).Google Scholar
14.Miyazawa, Y. and Pound, G. M., J. Crystal Growth 23, 357 (1973).Google Scholar
15.Paik, J. S. and Perepezko, J. H., to be published.Google Scholar
16.Microshnickenko, I. S. and Brekharya, G. P., Fiz. Metal. Metalloved, 29, 664 (1970).Google Scholar
17.Falkenhagen, G. and Hofman, W., Metallkde, Z.. 43, 69 (1952).Google Scholar
18.Giessen, B. C. in Developments in the Structural Chemistry of Alloy Phases, Giessen, B. C. ed. (Plenum Press, N.Y. 1969) 227.10.1007/978-1-4899-5564-7_8Google Scholar
19.Giessen, B. C. and Willens, R. H., in Phase Digrams: Materials Science and Technology III, Alper, A. M. ed. (Academic Press, N.Y. 1970) 104.Google Scholar
20.Perepezko, J. H. and Smith, J. S., J. Non-Crystalline Solids 44, 65 (1981).10.1016/0022-3093(81)90133-2Google Scholar
21.Hillert, M., Acta Met. 1,764 (1953).10.1016/0001-6160(53)90043-1Google Scholar
22.Cooper, K. P., Anderson, I. E. and Perepezko, J. H., in Rapidly Quenched Metals 4 (Japan Inst. of Metals, Sendai, 1981) in press.Google Scholar
23.Angell, C. A. and Donnella, J., J. Chem. Phys. 67, 4560 (1977).10.1063/1.434597Google Scholar
24.Ramachandrarao, P., Lal, K., Singhdeo, A. and Chattopadhyay, K., Mat. Sci. and Eng. 41, 259 (1979).Google Scholar
25.Adam, C. M. and Bourdeau, R. G., “Rapid Solidification Processing: Principles and Technologies II” Mehrabian, R., Kear, B. H. and Cohen, M. eds. (Claitors Pub., Baton Rouge 1980) 246.Google Scholar