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Title: Unidirectional solidification of a Zn-rich Zn-2.17 wt%Cu hypo-peritectic alloy
Authors: Ma, D.
Li, Y. 
Ng, S.C. 
Jones, H.
Keywords: Cellular growth
Hypo-peritectic alloy
Unidirectional solidification
Issue Date: Mar-2001
Citation: Ma, D., Li, Y., Ng, S.C., Jones, H. (2001-03). Unidirectional solidification of a Zn-rich Zn-2.17 wt%Cu hypo-peritectic alloy. Science and Technology of Advanced Materials 2 (1) : 127-130. ScholarBank@NUS Repository.
Abstract: Unidirectional solidification of a Zn-rich Zn-2.17 wt%Cu hypo-peritectic alloy has been carried out to investigate the microstructure evolution over the growth velocity range 0.02-4.82 mm/s at a temperature gradient of 15 K/mm by means of the Bridgman technique. Regular and plate-like two-phase cellular structures were observed in samples grown at growth velocities V above 0.48 and 2.64 mm/s, respectively. The dominant microstructure in samples grown below 0.22 mm/s was dendrites of primary ε in a matrix of secondary η. Intercellular spacing Λ decreased with increasing growth velocity V such that ΛV1/2 is a constant of 316 ± 55 μm3/2/s1/2. Secondary dendrite arm spacing λ2 of primary ε decreased with increasing V such that λ2V1/3 is a constant of 14.9 ± 0.9 μm4/3/s1/3. The observed transition from regular cells to plate-like cells of η is discussed on the basis of competitive growth and crystallographic effect. © 2001 Published by Elsevier Science Ltd.
Source Title: Science and Technology of Advanced Materials
ISSN: 14686996
DOI: 10.1016/S1468-6996(01)00038-9
Appears in Collections:Staff Publications

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