Abstract
The structure and mechanical properties of Sn-Zn unidirectionally frozen eutectic alloys have been examined over the growth range 5 to 4000mm h−1. The structure is predominantly broken-lamellar below 750mm h−1 but becomes increasingly fibrous at higher growth rates. The yield and ultimate strengths when tested in tension and compression were found to increase monotonically with growth rates up to 1000 mm h−1 above which they assumed near constant values. This behaviour is attributed to some loss of axial growth at higher growth rates. The hardness measured on transverse sections increased over the entire growth rate range. Annealing at near eutectic temperatures followed by quenching increased the strength of alloys grown at less than 750 mm h−1 and decreased that of those grown at higher rates. Similar behaviour was observed in selected Cd-Zn eutectic alloys. The increase in strength is attributed to solid solution hardening and the reduction to structural degradation during annealing. The Sn-rich matrix in this broken-lamellar eutectic appears to contribute significant strengthening to the composite.
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References
M. N. Crocker, R. S. Fidler and R. W. Smith, Proc. Roy. Soc. A335 (1973) 15.
M. N. Crocker, M. Mcparlan, D. Baragar and R. W. Smith, J. Crystal Growth 29 (1975) 85.
M. N. Crocker, D. Baragar and R. W. Smith, ibid. 30 (1975) 198.
M. Sahoo and R. W. Smith, Metal Science 9 (1975) 217.
Idem, Can. Met. Quart. 15 (1976) 1.
Idem, J. Mater. Sci. 11 (1976) 1125.
Idem, ibid. 11 (1976) 1680.
Idem, ibid. 13 (1978) 283.
Idem, ibid. 13 (1978) 1565.
M. Sahoo, G. W. Delamore and R. W. Smith, ibid. 15 (1980) 1097.
R. P. Elliot, “Constitution of Binary Alloys”, First Supplement, (McGraw Hill Inc., New York, 1965).
P. J. Taylor, H. W. Kerr and W. C. Winegard, Can. Met. Quart. 3 (1964) 235.
H. W. Kerr and W. C. Winegard, Can. Met. Quart. 6 (1967) 67.
R. W. Fidler, J. A. Spittle, M. R. Taylor and R. W. Smith, Publication 110 (The Solidification of Metals, Iron and Steel Inst., London, 1968) p. 173.
D. Jaffrey and G. A. Chadwick, Trans. Met. Soc. of AIME 245 (1969) 2435.
G. A. Chadwick, J. of Metals 92 (1963–4) 18.
W. A. Tiller, “Liquid Metals and Solidification” (American Society for Metals, Metals Park, Ohio, 1958) p. 276.
W. A. Tiller and R. Mrdjenovich, J. Appl. Phys. 34 (1963) 3639.
F. Vnuk, M. Sc. Thesis, University of Birmingham, 1968.
B. F. Dyson, J. App. Phys. 37 (1966) 2375.
F. H. Huang and H. B. Huntingdon, Phys. Rev. B. 9 (1974) 1479.
F. Vnuk, M. H. Ainsley and R. W. Smith, unpublished work.
R. S. Fidler, Ph.D. Thesis, Birmingham University, 1969.
R. Elliot and A. Moore, Scripta Met. 3 (1969) 249.
R. W. Smith, “The Solidification of Metals” Iron and Steel Inst. Special Report, London, 110 (1968) 226.
D. Baragar, M. Sahoo, and R. W. Smith, “Solidification of Metals and Castings” (The Metals Society, London, 1979) p. 88.
H. Bibring, Proceedings of the Conference on In-Situ Composites, Vol. II (National Academy of Eng., Washington, D.C., 1973), p. 1.
H. B. Huntingdon, Solid State Phys. I (1958) 278.
“Properties of Tin” (Tin Research Institute, Middlesex, England, 1954) p. 42.
“Advances in Materials Research”, edited by Herbert Herman, Vol. 5 (Willey-Interscience, New York, 1971), p. 134.
R. V. Coleman, B. Price and N. Cabreva, J. App. Phys 28 (1957) 1360.
D. Tabor, “The Hardness of Metals” (Oxford University Press, Oxford, 1951) p. 107.
J. R. Cahoon, Met. Transactions 3 (1972) p. 3040.
R. Van Der Merwe, M. Sahoo, R. W. Smith, Conference on In-Situ Composites-III (Ginn Custom Publishing, Lexington, 1979) 107.
Idem, Ph.D. Thesis, Queen's University, 1980.
R. W. Smith, unpublished work.
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Vnuk, F., Sahoo, M., Baragar, D. et al. Mechanical properties of the Sn-Zn eutectic alloys. J Mater Sci 15, 2573–2583 (1980). https://doi.org/10.1007/BF00550762
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DOI: https://doi.org/10.1007/BF00550762